fix: resolve type error, formatting, and import order from PR #321

added a new Feature that allows user to pause/resume while screen rec…

.github/workflows/build.yml

@@ -94,6 +94,7 @@ jobs:
         uses: actions/upload-artifact@v4
         with:
           name: linux-installer
-          path: release/**/*.AppImage
+          path: |
+            release/**/*.AppImage
+            release/**/*.zsync
           retention-days: 30
-

.nvmrc

@@ -0,0 +1 @@
+22.22.1

README.md

@@ -8,6 +8,10 @@
   <a href="https://deepwiki.com/siddharthvaddem/openscreen">
     <img src="https://deepwiki.com/badge.svg" alt="Ask DeepWiki" />
   </a>
+  &nbsp;
+  <a href="https://discord.gg/yAQQhRaEeg">
+    <img src="https://img.shields.io/discord/pHAUbcqNd?logo=discord&label=Discord&color=5865F2" alt="Join Discord" />
+  </a>
 </p>
 
 # <p align="center">OpenScreen</p>

electron-builder.json5

@@ -20,14 +20,15 @@
     "!CONTRIBUTING.md",
     "!LICENSE"
   ],
-  "extraResources": [
-    {
-      "from": "public/wallpapers",
-      "to": "assets/wallpapers"
-    }
-  ],
-
-  "mac": {
+  "extraResources": [
+    {
+      "from": "public/wallpapers",
+      "to": "assets/wallpapers"
+    }
+  ],
+  "publish": [{"provider": "github"}],
+
+  "mac": {
     "hardenedRuntime": false,
     "target": [
       {

electron/electron-env.d.ts

@@ -136,6 +136,7 @@ interface Window {
 		setMicrophoneExpanded: (expanded: boolean) => void;
 		setHasUnsavedChanges: (hasChanges: boolean) => void;
 		onRequestSaveBeforeClose: (callback: () => Promise<boolean> | boolean) => () => void;
+		setLocale: (locale: string) => Promise<void>;
 	};
 }
 

electron/i18n.ts

@@ -0,0 +1,59 @@
+// Lightweight i18n for the Electron main process.
+// Imports the same JSON translation files used by the renderer.
+
+import commonEn from "../src/i18n/locales/en/common.json";
+import dialogsEn from "../src/i18n/locales/en/dialogs.json";
+import commonEs from "../src/i18n/locales/es/common.json";
+import dialogsEs from "../src/i18n/locales/es/dialogs.json";
+import commonZh from "../src/i18n/locales/zh-CN/common.json";
+import dialogsZh from "../src/i18n/locales/zh-CN/dialogs.json";
+
+type Locale = "en" | "zh-CN" | "es";
+type Namespace = "common" | "dialogs";
+type MessageMap = Record<string, unknown>;
+
+const messages: Record<Locale, Record<Namespace, MessageMap>> = {
+	en: { common: commonEn, dialogs: dialogsEn },
+	"zh-CN": { common: commonZh, dialogs: dialogsZh },
+	es: { common: commonEs, dialogs: dialogsEs },
+};
+
+let currentLocale: Locale = "en";
+
+export function setMainLocale(locale: string) {
+	if (locale === "en" || locale === "zh-CN" || locale === "es") {
+		currentLocale = locale;
+	}
+}
+
+export function getMainLocale(): Locale {
+	return currentLocale;
+}
+
+function getMessageValue(obj: unknown, dotPath: string): string | undefined {
+	const keys = dotPath.split(".");
+	let current: unknown = obj;
+	for (const key of keys) {
+		if (current == null || typeof current !== "object") return undefined;
+		current = (current as Record<string, unknown>)[key];
+	}
+	return typeof current === "string" ? current : undefined;
+}
+
+function interpolate(str: string, vars?: Record<string, string | number>): string {
+	if (!vars) return str;
+	return str.replace(/\{\{(\w+)\}\}/g, (_, key: string) => String(vars[key] ?? `{{${key}}}`));
+}
+
+export function mainT(
+	namespace: Namespace,
+	key: string,
+	vars?: Record<string, string | number>,
+): string {
+	const value =
+		getMessageValue(messages[currentLocale]?.[namespace], key) ??
+		getMessageValue(messages.en?.[namespace], key);
+
+	if (value == null) return `${namespace}.${key}`;
+	return interpolate(value, vars);
+}

electron/ipc/handlers.ts

@@ -17,6 +17,7 @@ import {
 	type RecordingSession,
 	type StoreRecordedSessionInput,
 } from "../../src/lib/recordingSession";
+import { mainT } from "../i18n";
 import { RECORDINGS_DIR } from "../main";
 
 const PROJECT_FILE_EXTENSION = "openscreen";
@@ -472,11 +473,13 @@ export function registerIpcHandlers(
 			// Determine file type from extension
 			const isGif = fileName.toLowerCase().endsWith(".gif");
 			const filters = isGif
-				? [{ name: "GIF Image", extensions: ["gif"] }]
-				: [{ name: "MP4 Video", extensions: ["mp4"] }];
+				? [{ name: mainT("dialogs", "fileDialogs.gifImage"), extensions: ["gif"] }]
+				: [{ name: mainT("dialogs", "fileDialogs.mp4Video"), extensions: ["mp4"] }];
 
 			const result = await dialog.showSaveDialog({
-				title: isGif ? "Save Exported GIF" : "Save Exported Video",
+				title: isGif
+					? mainT("dialogs", "fileDialogs.saveGif")
+					: mainT("dialogs", "fileDialogs.saveVideo"),
 				defaultPath: path.join(app.getPath("downloads"), fileName),
 				filters,
 				properties: ["createDirectory", "showOverwriteConfirmation"],
@@ -510,11 +513,14 @@ export function registerIpcHandlers(
 	ipcMain.handle("open-video-file-picker", async () => {
 		try {
 			const result = await dialog.showOpenDialog({
-				title: "Select Video File",
+				title: mainT("dialogs", "fileDialogs.selectVideo"),
 				defaultPath: RECORDINGS_DIR,
 				filters: [
-					{ name: "Video Files", extensions: ["webm", "mp4", "mov", "avi", "mkv"] },
-					{ name: "All Files", extensions: ["*"] },
+					{
+						name: mainT("dialogs", "fileDialogs.videoFiles"),
+						extensions: ["webm", "mp4", "mov", "avi", "mkv"],
+					},
+					{ name: mainT("dialogs", "fileDialogs.allFiles"), extensions: ["*"] },
 				],
 				properties: ["openFile"],
 			});
@@ -590,10 +596,13 @@ export function registerIpcHandlers(
 					: `${safeName}.${PROJECT_FILE_EXTENSION}`;
 
 				const result = await dialog.showSaveDialog({
-					title: "Save OpenScreen Project",
+					title: mainT("dialogs", "fileDialogs.saveProject"),
 					defaultPath: path.join(RECORDINGS_DIR, defaultName),
 					filters: [
-						{ name: "OpenScreen Project", extensions: [PROJECT_FILE_EXTENSION] },
+						{
+							name: mainT("dialogs", "fileDialogs.openscreenProject"),
+							extensions: [PROJECT_FILE_EXTENSION],
+						},
 						{ name: "JSON", extensions: ["json"] },
 					],
 					properties: ["createDirectory", "showOverwriteConfirmation"],
@@ -629,12 +638,15 @@ export function registerIpcHandlers(
 	ipcMain.handle("load-project-file", async () => {
 		try {
 			const result = await dialog.showOpenDialog({
-				title: "Open OpenScreen Project",
+				title: mainT("dialogs", "fileDialogs.openProject"),
 				defaultPath: RECORDINGS_DIR,
 				filters: [
-					{ name: "OpenScreen Project", extensions: [PROJECT_FILE_EXTENSION] },
+					{
+						name: mainT("dialogs", "fileDialogs.openscreenProject"),
+						extensions: [PROJECT_FILE_EXTENSION],
+					},
 					{ name: "JSON", extensions: ["json"] },
-					{ name: "All Files", extensions: ["*"] },
+					{ name: mainT("dialogs", "fileDialogs.allFiles"), extensions: ["*"] },
 				],
 				properties: ["openFile"],
 			});

electron/main.ts

@@ -12,6 +12,7 @@ import {
 	systemPreferences,
 	Tray,
 } from "electron";
+import { mainT, setMainLocale } from "./i18n";
 import { registerIpcHandlers } from "./ipc/handlers";
 import { createEditorWindow, createHudOverlayWindow, createSourceSelectorWindow } from "./windows";
 
@@ -130,20 +131,20 @@ function setupApplicationMenu() {
 
 	template.push(
 		{
-			label: "File",
+			label: mainT("common", "actions.file") || "File",
 			submenu: [
 				{
-					label: "Load Project…",
+					label: mainT("dialogs", "unsavedChanges.loadProject") || "Load Project…",
 					accelerator: "CmdOrCtrl+O",
 					click: () => sendEditorMenuAction("menu-load-project"),
 				},
 				{
-					label: "Save Project…",
+					label: mainT("dialogs", "unsavedChanges.saveProject") || "Save Project…",
 					accelerator: "CmdOrCtrl+S",
 					click: () => sendEditorMenuAction("menu-save-project"),
 				},
 				{
-					label: "Save Project As…",
+					label: mainT("dialogs", "unsavedChanges.saveProjectAs") || "Save Project As…",
 					accelerator: "CmdOrCtrl+Shift+S",
 					click: () => sendEditorMenuAction("menu-save-project-as"),
 				},
@@ -151,7 +152,7 @@ function setupApplicationMenu() {
 			],
 		},
 		{
-			label: "Edit",
+			label: mainT("common", "actions.edit") || "Edit",
 			submenu: [
 				{ role: "undo" },
 				{ role: "redo" },
@@ -163,7 +164,7 @@ function setupApplicationMenu() {
 			],
 		},
 		{
-			label: "View",
+			label: mainT("common", "actions.view") || "View",
 			submenu: [
 				{ role: "reload" },
 				{ role: "forceReload" },
@@ -177,7 +178,7 @@ function setupApplicationMenu() {
 			],
 		},
 		{
-			label: "Window",
+			label: mainT("common", "actions.window") || "Window",
 			submenu: isMac
 				? [{ role: "minimize" }, { role: "zoom" }, { type: "separator" }, { role: "front" }]
 				: [{ role: "minimize" }, { role: "close" }],
@@ -215,7 +216,7 @@ function updateTrayMenu(recording: boolean = false) {
 	const menuTemplate = recording
 		? [
 				{
-					label: "Stop Recording",
+					label: mainT("common", "actions.stopRecording") || "Stop Recording",
 					click: () => {
 						if (mainWindow && !mainWindow.isDestroyed()) {
 							mainWindow.webContents.send("stop-recording-from-tray");
@@ -225,13 +226,13 @@ function updateTrayMenu(recording: boolean = false) {
 			]
 		: [
 				{
-					label: "Open",
+					label: mainT("common", "actions.open") || "Open",
 					click: () => {
 						showMainWindow();
 					},
 				},
 				{
-					label: "Quit",
+					label: mainT("common", "actions.quit") || "Quit",
 					click: () => {
 						app.quit();
 					},
@@ -281,12 +282,16 @@ function createEditorWindowWrapper() {
 
 		const choice = dialog.showMessageBoxSync(mainWindow!, {
 			type: "warning",
-			buttons: ["Save & Close", "Discard & Close", "Cancel"],
+			buttons: [
+				mainT("dialogs", "unsavedChanges.saveAndClose"),
+				mainT("dialogs", "unsavedChanges.discardAndClose"),
+				mainT("common", "actions.cancel"),
+			],
 			defaultId: 0,
 			cancelId: 2,
-			title: "Unsaved Changes",
-			message: "You have unsaved changes.",
-			detail: "Do you want to save your project before closing?",
+			title: mainT("dialogs", "unsavedChanges.title"),
+			message: mainT("dialogs", "unsavedChanges.message"),
+			detail: mainT("dialogs", "unsavedChanges.detail"),
 		});
 
 		const windowToClose = mainWindow;
@@ -354,6 +359,12 @@ app.whenReady().then(async () => {
 	ipcMain.on("hud-overlay-close", () => {
 		app.quit();
 	});
+	ipcMain.handle("set-locale", (_, locale: string) => {
+		setMainLocale(locale);
+		setupApplicationMenu();
+		updateTrayMenu();
+	});
+
 	createTray();
 	updateTrayMenu();
 	setupApplicationMenu();

electron/preload.ts

@@ -115,6 +115,9 @@ contextBridge.exposeInMainWorld("electronAPI", {
 	saveShortcuts: (shortcuts: unknown) => {
 		return ipcRenderer.invoke("save-shortcuts", shortcuts);
 	},
+	setLocale: (locale: string) => {
+		return ipcRenderer.invoke("set-locale", locale);
+	},
 	setMicrophoneExpanded: (expanded: boolean) => {
 		ipcRenderer.send("hud:setMicrophoneExpanded", expanded);
 	},

electron/windows.ts

@@ -21,8 +21,8 @@ export function createHudOverlayWindow(): BrowserWindow {
 	const primaryDisplay = screen.getPrimaryDisplay();
 	const { workArea } = primaryDisplay;
 
-	const windowWidth = 500;
-	const windowHeight = 155;
+	const windowWidth = 600;
+	const windowHeight = 160;
 
 	const x = Math.floor(workArea.x + (workArea.width - windowWidth) / 2);
 	const y = Math.floor(workArea.y + workArea.height - windowHeight - 5);
@@ -30,10 +30,10 @@ export function createHudOverlayWindow(): BrowserWindow {
 	const win = new BrowserWindow({
 		width: windowWidth,
 		height: windowHeight,
-		minWidth: 500,
-		maxWidth: 500,
-		minHeight: 155,
-		maxHeight: 155,
+		minWidth: 600,
+		maxWidth: 600,
+		minHeight: 160,
+		maxHeight: 160,
 		x: x,
 		y: y,
 		frame: false,

package-lock.json

@@ -1,12 +1,12 @@
 {
 	"name": "openscreen",
-	"version": "1.2.0",
+	"version": "1.3.0",
 	"lockfileVersion": 3,
 	"requires": true,
 	"packages": {
 		"": {
 			"name": "openscreen",
-			"version": "1.2.0",
+			"version": "1.3.0",
 			"dependencies": {
 				"@fix-webm-duration/fix": "^1.0.1",
 				"@pixi/filter-drop-shadow": "^5.2.0",
@@ -52,6 +52,9 @@
 			"devDependencies": {
 				"@biomejs/biome": "^2.3.13",
 				"@playwright/test": "^1.58.2",
+				"@testing-library/jest-dom": "^6.9.1",
+				"@testing-library/react": "^16.3.2",
+				"@testing-library/user-event": "^14.6.1",
 				"@types/node": "^25.0.3",
 				"@types/react": "^18.2.64",
 				"@types/react-dom": "^18.2.21",
@@ -64,6 +67,7 @@
 				"electron-rebuild": "^3.2.9",
 				"fast-check": "^4.5.2",
 				"husky": "^9.1.7",
+				"jsdom": "^29.0.1",
 				"lint-staged": "^16.3.2",
 				"postcss": "^8.5.6",
 				"tailwindcss": "^3.4.18",
@@ -73,8 +77,19 @@
 				"vite-plugin-electron": "^0.28.6",
 				"vite-plugin-electron-renderer": "^0.14.5",
 				"vitest": "^4.0.16"
+			},
+			"engines": {
+				"node": "22.22.1",
+				"npm": "10.9.4"
 			}
 		},
+		"node_modules/@adobe/css-tools": {
+			"version": "4.4.4",
+			"resolved": "https://registry.npmjs.org/@adobe/css-tools/-/css-tools-4.4.4.tgz",
+			"integrity": "sha512-Elp+iwUx5rN5+Y8xLt5/GRoG20WGoDCQ/1Fb+1LiGtvwbDavuSk0jhD/eZdckHAuzcDzccnkv+rEjyWfRx18gg==",
+			"dev": true,
+			"license": "MIT"
+		},
 		"node_modules/@alloc/quick-lru": {
 			"version": "5.2.0",
 			"resolved": "https://registry.npmjs.org/@alloc/quick-lru/-/quick-lru-5.2.0.tgz",
@@ -87,6 +102,67 @@
 				"url": "https://github.com/sponsors/sindresorhus"
 			}
 		},
+		"node_modules/@asamuzakjp/css-color": {
+			"version": "5.0.1",
+			"resolved": "https://registry.npmjs.org/@asamuzakjp/css-color/-/css-color-5.0.1.tgz",
+			"integrity": "sha512-2SZFvqMyvboVV1d15lMf7XiI3m7SDqXUuKaTymJYLN6dSGadqp+fVojqJlVoMlbZnlTmu3S0TLwLTJpvBMO1Aw==",
+			"dev": true,
+			"license": "MIT",
+			"dependencies": {
+				"@csstools/css-calc": "^3.1.1",
+				"@csstools/css-color-parser": "^4.0.2",
+				"@csstools/css-parser-algorithms": "^4.0.0",
+				"@csstools/css-tokenizer": "^4.0.0",
+				"lru-cache": "^11.2.6"
+			},
+			"engines": {
+				"node": "^20.19.0 || ^22.12.0 || >=24.0.0"
+			}
+		},
+		"node_modules/@asamuzakjp/css-color/node_modules/lru-cache": {
+			"version": "11.2.7",
+			"resolved": "https://registry.npmjs.org/lru-cache/-/lru-cache-11.2.7.tgz",
+			"integrity": "sha512-aY/R+aEsRelme17KGQa/1ZSIpLpNYYrhcrepKTZgE+W3WM16YMCaPwOHLHsmopZHELU0Ojin1lPVxKR0MihncA==",
+			"dev": true,
+			"license": "BlueOak-1.0.0",
+			"engines": {
+				"node": "20 || >=22"
+			}
+		},
+		"node_modules/@asamuzakjp/dom-selector": {
+			"version": "7.0.4",
+			"resolved": "https://registry.npmjs.org/@asamuzakjp/dom-selector/-/dom-selector-7.0.4.tgz",
+			"integrity": "sha512-jXR6x4AcT3eIrS2fSNAwJpwirOkGcd+E7F7CP3zjdTqz9B/2huHOL8YJZBgekKwLML+u7qB/6P1LXQuMScsx0w==",
+			"dev": true,
+			"license": "MIT",
+			"dependencies": {
+				"@asamuzakjp/nwsapi": "^2.3.9",
+				"bidi-js": "^1.0.3",
+				"css-tree": "^3.2.1",
+				"is-potential-custom-element-name": "^1.0.1",
+				"lru-cache": "^11.2.7"
+			},
+			"engines": {
+				"node": "^20.19.0 || ^22.12.0 || >=24.0.0"
+			}
+		},
+		"node_modules/@asamuzakjp/dom-selector/node_modules/lru-cache": {
+			"version": "11.2.7",
+			"resolved": "https://registry.npmjs.org/lru-cache/-/lru-cache-11.2.7.tgz",
+			"integrity": "sha512-aY/R+aEsRelme17KGQa/1ZSIpLpNYYrhcrepKTZgE+W3WM16YMCaPwOHLHsmopZHELU0Ojin1lPVxKR0MihncA==",
+			"dev": true,
+			"license": "BlueOak-1.0.0",
+			"engines": {
+				"node": "20 || >=22"
+			}
+		},
+		"node_modules/@asamuzakjp/nwsapi": {
+			"version": "2.3.9",
+			"resolved": "https://registry.npmjs.org/@asamuzakjp/nwsapi/-/nwsapi-2.3.9.tgz",
+			"integrity": "sha512-n8GuYSrI9bF7FFZ/SjhwevlHc8xaVlb/7HmHelnc/PZXBD2ZR49NnN9sMMuDdEGPeeRQ5d0hqlSlEpgCX3Wl0Q==",
+			"dev": true,
+			"license": "MIT"
+		},
 		"node_modules/@babel/code-frame": {
 			"version": "7.27.1",
 			"resolved": "https://registry.npmjs.org/@babel/code-frame/-/code-frame-7.27.1.tgz",
@@ -561,6 +637,159 @@
 				"node": ">=14.21.3"
 			}
 		},
+		"node_modules/@bramus/specificity": {
+			"version": "2.4.2",
+			"resolved": "https://registry.npmjs.org/@bramus/specificity/-/specificity-2.4.2.tgz",
+			"integrity": "sha512-ctxtJ/eA+t+6q2++vj5j7FYX3nRu311q1wfYH3xjlLOsczhlhxAg2FWNUXhpGvAw3BWo1xBcvOV6/YLc2r5FJw==",
+			"dev": true,
+			"license": "MIT",
+			"dependencies": {
+				"css-tree": "^3.0.0"
+			},
+			"bin": {
+				"specificity": "bin/cli.js"
+			}
+		},
+		"node_modules/@csstools/color-helpers": {
+			"version": "6.0.2",
+			"resolved": "https://registry.npmjs.org/@csstools/color-helpers/-/color-helpers-6.0.2.tgz",
+			"integrity": "sha512-LMGQLS9EuADloEFkcTBR3BwV/CGHV7zyDxVRtVDTwdI2Ca4it0CCVTT9wCkxSgokjE5Ho41hEPgb8OEUwoXr6Q==",
+			"dev": true,
+			"funding": [
+				{
+					"type": "github",
+					"url": "https://github.com/sponsors/csstools"
+				},
+				{
+					"type": "opencollective",
+					"url": "https://opencollective.com/csstools"
+				}
+			],
+			"license": "MIT-0",
+			"engines": {
+				"node": ">=20.19.0"
+			}
+		},
+		"node_modules/@csstools/css-calc": {
+			"version": "3.1.1",
+			"resolved": "https://registry.npmjs.org/@csstools/css-calc/-/css-calc-3.1.1.tgz",
+			"integrity": "sha512-HJ26Z/vmsZQqs/o3a6bgKslXGFAungXGbinULZO3eMsOyNJHeBBZfup5FiZInOghgoM4Hwnmw+OgbJCNg1wwUQ==",
+			"dev": true,
+			"funding": [
+				{
+					"type": "github",
+					"url": "https://github.com/sponsors/csstools"
+				},
+				{
+					"type": "opencollective",
+					"url": "https://opencollective.com/csstools"
+				}
+			],
+			"license": "MIT",
+			"engines": {
+				"node": ">=20.19.0"
+			},
+			"peerDependencies": {
+				"@csstools/css-parser-algorithms": "^4.0.0",
+				"@csstools/css-tokenizer": "^4.0.0"
+			}
+		},
+		"node_modules/@csstools/css-color-parser": {
+			"version": "4.0.2",
+			"resolved": "https://registry.npmjs.org/@csstools/css-color-parser/-/css-color-parser-4.0.2.tgz",
+			"integrity": "sha512-0GEfbBLmTFf0dJlpsNU7zwxRIH0/BGEMuXLTCvFYxuL1tNhqzTbtnFICyJLTNK4a+RechKP75e7w42ClXSnJQw==",
+			"dev": true,
+			"funding": [
+				{
+					"type": "github",
+					"url": "https://github.com/sponsors/csstools"
+				},
+				{
+					"type": "opencollective",
+					"url": "https://opencollective.com/csstools"
+				}
+			],
+			"license": "MIT",
+			"dependencies": {
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+			"integrity": "sha512-LktZQb3IeoUWB9lqR5EWTHgW/VTITCXg4D21M+lvybRVdylLrRMnqaIONLVb5mav8vM19m44HIcGq4qASeu2Qw==",
+			"dev": true,
+			"license": "BSD-3-Clause",
+			"dependencies": {
+				"tldts": "^7.0.5"
+			},
+			"engines": {
+				"node": ">=16"
+			}
+		},
 		"node_modules/jsesc": {
 			"version": "3.1.0",
 			"resolved": "https://registry.npmjs.org/jsesc/-/jsesc-3.1.0.tgz",
@@ -9545,6 +10067,17 @@
 				"react": "^16.5.1 || ^17.0.0 || ^18.0.0 || ^19.0.0"
 			}
 		},
+		"node_modules/lz-string": {
+			"version": "1.5.0",
+			"resolved": "https://registry.npmjs.org/lz-string/-/lz-string-1.5.0.tgz",
+			"integrity": "sha512-h5bgJWpxJNswbU7qCrV0tIKQCaS3blPDrqKWx+QxzuzL1zGUzij9XCWLrSLsJPu5t+eWA/ycetzYAO5IOMcWAQ==",
+			"dev": true,
+			"license": "MIT",
+			"peer": true,
+			"bin": {
+				"lz-string": "bin/bin.js"
+			}
+		},
 		"node_modules/lzma-native": {
 			"version": "8.0.6",
 			"resolved": "https://registry.npmjs.org/lzma-native/-/lzma-native-8.0.6.tgz",
@@ -9662,6 +10195,13 @@
 				"node": ">= 0.4"
 			}
 		},
+		"node_modules/mdn-data": {
+			"version": "2.27.1",
+			"resolved": "https://registry.npmjs.org/mdn-data/-/mdn-data-2.27.1.tgz",
+			"integrity": "sha512-9Yubnt3e8A0OKwxYSXyhLymGW4sCufcLG6VdiDdUGVkPhpqLxlvP5vl1983gQjJl3tqbrM731mjaZaP68AgosQ==",
+			"dev": true,
+			"license": "CC0-1.0"
+		},
 		"node_modules/mediabunny": {
 			"version": "1.25.1",
 			"resolved": "https://registry.npmjs.org/mediabunny/-/mediabunny-1.25.1.tgz",
@@ -9786,6 +10326,16 @@
 				"dom-walk": "^0.1.0"
 			}
 		},
+		"node_modules/min-indent": {
+			"version": "1.0.1",
+			"resolved": "https://registry.npmjs.org/min-indent/-/min-indent-1.0.1.tgz",
+			"integrity": "sha512-I9jwMn07Sy/IwOj3zVkVik2JTvgpaykDZEigL6Rx6N9LbMywwUSMtxET+7lVoDLLd3O3IXwJwvuuns8UB/HeAg==",
+			"dev": true,
+			"license": "MIT",
+			"engines": {
+				"node": ">=4"
+			}
+		},
 		"node_modules/minimatch": {
 			"version": "9.0.5",
 			"resolved": "https://registry.npmjs.org/minimatch/-/minimatch-9.0.5.tgz",
@@ -10563,6 +11113,19 @@
 			"integrity": "sha512-JyPSBnkTJ0AI8GGJLfMXvKq42cj5c006fnLz6fXy6zfoVjJizi8BNTpu8on8ziI1cKy9d9DGNuY17Ce7wuejpQ==",
 			"license": "MIT"
 		},
+		"node_modules/parse5": {
+			"version": "8.0.0",
+			"resolved": "https://registry.npmjs.org/parse5/-/parse5-8.0.0.tgz",
+			"integrity": "sha512-9m4m5GSgXjL4AjumKzq1Fgfp3Z8rsvjRNbnkVwfu2ImRqE5D0LnY2QfDen18FSY9C573YU5XxSapdHZTZ2WolA==",
+			"dev": true,
+			"license": "MIT",
+			"dependencies": {
+				"entities": "^6.0.0"
+			},
+			"funding": {
+				"url": "https://github.com/inikulin/parse5?sponsor=1"
+			}
+		},
 		"node_modules/path-is-absolute": {
 			"version": "1.0.1",
 			"resolved": "https://registry.npmjs.org/path-is-absolute/-/path-is-absolute-1.0.1.tgz",
@@ -11170,6 +11733,44 @@
 				"node": "^12.20.0 || >=14"
 			}
 		},
+		"node_modules/pretty-format": {
+			"version": "27.5.1",
+			"resolved": "https://registry.npmjs.org/pretty-format/-/pretty-format-27.5.1.tgz",
+			"integrity": "sha512-Qb1gy5OrP5+zDf2Bvnzdl3jsTf1qXVMazbvCoKhtKqVs4/YK4ozX4gKQJJVyNe+cajNPn0KoC0MC3FUmaHWEmQ==",
+			"dev": true,
+			"license": "MIT",
+			"peer": true,
+			"dependencies": {
+				"ansi-regex": "^5.0.1",
+				"ansi-styles": "^5.0.0",
+				"react-is": "^17.0.1"
+			},
+			"engines": {
+				"node": "^10.13.0 || ^12.13.0 || ^14.15.0 || >=15.0.0"
+			}
+		},
+		"node_modules/pretty-format/node_modules/ansi-styles": {
+			"version": "5.2.0",
+			"resolved": "https://registry.npmjs.org/ansi-styles/-/ansi-styles-5.2.0.tgz",
+			"integrity": "sha512-Cxwpt2SfTzTtXcfOlzGEee8O+c+MmUgGrNiBcXnuWxuFJHe6a5Hz7qwhwe5OgaSYI0IJvkLqWX1ASG+cJOkEiA==",
+			"dev": true,
+			"license": "MIT",
+			"peer": true,
+			"engines": {
+				"node": ">=10"
+			},
+			"funding": {
+				"url": "https://github.com/chalk/ansi-styles?sponsor=1"
+			}
+		},
+		"node_modules/pretty-format/node_modules/react-is": {
+			"version": "17.0.2",
+			"resolved": "https://registry.npmjs.org/react-is/-/react-is-17.0.2.tgz",
+			"integrity": "sha512-w2GsyukL62IJnlaff/nRegPQR94C/XXamvMWmSHRJ4y7Ts/4ocGRmTHvOs8PSE6pB3dWOrD/nueuU5sduBsQ4w==",
+			"dev": true,
+			"license": "MIT",
+			"peer": true
+		},
 		"node_modules/proc-log": {
 			"version": "5.0.0",
 			"resolved": "https://registry.npmjs.org/proc-log/-/proc-log-5.0.0.tgz",
@@ -11720,6 +12321,20 @@
 				"node": ">=8.10.0"
 			}
 		},
+		"node_modules/redent": {
+			"version": "3.0.0",
+			"resolved": "https://registry.npmjs.org/redent/-/redent-3.0.0.tgz",
+			"integrity": "sha512-6tDA8g98We0zd0GvVeMT9arEOnTw9qM03L9cJXaCjrip1OO764RDBLBfrB4cwzNGDj5OA5ioymC9GkizgWJDUg==",
+			"dev": true,
+			"license": "MIT",
+			"dependencies": {
+				"indent-string": "^4.0.0",
+				"strip-indent": "^3.0.0"
+			},
+			"engines": {
+				"node": ">=8"
+			}
+		},
 		"node_modules/regenerator-runtime": {
 			"version": "0.13.11",
 			"resolved": "https://registry.npmjs.org/regenerator-runtime/-/regenerator-runtime-0.13.11.tgz",
@@ -11816,6 +12431,16 @@
 				"node": ">=0.10.0"
 			}
 		},
+		"node_modules/require-from-string": {
+			"version": "2.0.2",
+			"resolved": "https://registry.npmjs.org/require-from-string/-/require-from-string-2.0.2.tgz",
+			"integrity": "sha512-Xf0nWe6RseziFMu+Ap9biiUbmplq6S9/p+7w7YXP/JBHhrUDDUhwa+vANyubuqfZWTveU//DYVGsDG7RKL/vEw==",
+			"dev": true,
+			"license": "MIT",
+			"engines": {
+				"node": ">=0.10.0"
+			}
+		},
 		"node_modules/require-main-filename": {
 			"version": "1.0.1",
 			"resolved": "https://registry.npmjs.org/require-main-filename/-/require-main-filename-1.0.1.tgz",
@@ -12081,6 +12706,19 @@
 			"dev": true,
 			"license": "ISC"
 		},
+		"node_modules/saxes": {
+			"version": "6.0.0",
+			"resolved": "https://registry.npmjs.org/saxes/-/saxes-6.0.0.tgz",
+			"integrity": "sha512-xAg7SOnEhrm5zI3puOOKyy1OMcMlIJZYNJY7xLBwSze0UjhPLnWfj2GF2EpT0jmzaJKIWKHLsaSSajf35bcYnA==",
+			"dev": true,
+			"license": "ISC",
+			"dependencies": {
+				"xmlchars": "^2.2.0"
+			},
+			"engines": {
+				"node": ">=v12.22.7"
+			}
+		},
 		"node_modules/scheduler": {
 			"version": "0.23.2",
 			"resolved": "https://registry.npmjs.org/scheduler/-/scheduler-0.23.2.tgz",
@@ -12599,6 +13237,19 @@
 				"node": ">=0.10.0"
 			}
 		},
+		"node_modules/strip-indent": {
+			"version": "3.0.0",
+			"resolved": "https://registry.npmjs.org/strip-indent/-/strip-indent-3.0.0.tgz",
+			"integrity": "sha512-laJTa3Jb+VQpaC6DseHhF7dXVqHTfJPCRDaEbid/drOhgitgYku/letMUqOXFoWV0zIIUbjpdH2t+tYj4bQMRQ==",
+			"dev": true,
+			"license": "MIT",
+			"dependencies": {
+				"min-indent": "^1.0.0"
+			},
+			"engines": {
+				"node": ">=8"
+			}
+		},
 		"node_modules/strtok3": {
 			"version": "6.3.0",
 			"resolved": "https://registry.npmjs.org/strtok3/-/strtok3-6.3.0.tgz",
@@ -12864,6 +13515,13 @@
 				"camelcase": "^3.0.0"
 			}
 		},
+		"node_modules/symbol-tree": {
+			"version": "3.2.4",
+			"resolved": "https://registry.npmjs.org/symbol-tree/-/symbol-tree-3.2.4.tgz",
+			"integrity": "sha512-9QNk5KwDF+Bvz+PyObkmSYjI5ksVUYtjW7AU22r2NKcfLJcXp96hkDWU3+XndOsUb+AQ9QhfzfCT2O+CNWT5Tw==",
+			"dev": true,
+			"license": "MIT"
+		},
 		"node_modules/tailwind-merge": {
 			"version": "3.3.1",
 			"resolved": "https://registry.npmjs.org/tailwind-merge/-/tailwind-merge-3.3.1.tgz",
@@ -13213,6 +13871,26 @@
 				"node": ">=14.0.0"
 			}
 		},
+		"node_modules/tldts": {
+			"version": "7.0.27",
+			"resolved": "https://registry.npmjs.org/tldts/-/tldts-7.0.27.tgz",
+			"integrity": "sha512-I4FZcVFcqCRuT0ph6dCDpPuO4Xgzvh+spkcTr1gK7peIvxWauoloVO0vuy1FQnijT63ss6AsHB6+OIM4aXHbPg==",
+			"dev": true,
+			"license": "MIT",
+			"dependencies": {
+				"tldts-core": "^7.0.27"
+			},
+			"bin": {
+				"tldts": "bin/cli.js"
+			}
+		},
+		"node_modules/tldts-core": {
+			"version": "7.0.27",
+			"resolved": "https://registry.npmjs.org/tldts-core/-/tldts-core-7.0.27.tgz",
+			"integrity": "sha512-YQ7uPjgWUibIK6DW5lrKujGwUKhLevU4hcGbP5O6TcIUb+oTjJYJVWPS4nZsIHrEEEG6myk/oqAJUEQmpZrHsg==",
+			"dev": true,
+			"license": "MIT"
+		},
 		"node_modules/tmp": {
 			"version": "0.2.5",
 			"resolved": "https://registry.npmjs.org/tmp/-/tmp-0.2.5.tgz",
@@ -13277,6 +13955,19 @@
 				"node": ">=0.8"
 			}
 		},
+		"node_modules/tr46": {
+			"version": "6.0.0",
+			"resolved": "https://registry.npmjs.org/tr46/-/tr46-6.0.0.tgz",
+			"integrity": "sha512-bLVMLPtstlZ4iMQHpFHTR7GAGj2jxi8Dg0s2h2MafAE4uSWF98FC/3MomU51iQAMf8/qDUbKWf5GxuvvVcXEhw==",
+			"dev": true,
+			"license": "MIT",
+			"dependencies": {
+				"punycode": "^2.3.1"
+			},
+			"engines": {
+				"node": ">=20"
+			}
+		},
 		"node_modules/truncate-utf8-bytes": {
 			"version": "1.0.2",
 			"resolved": "https://registry.npmjs.org/truncate-utf8-bytes/-/truncate-utf8-bytes-1.0.2.tgz",
@@ -13340,6 +14031,16 @@
 				"node": ">=14.17"
 			}
 		},
+		"node_modules/undici": {
+			"version": "7.24.6",
+			"resolved": "https://registry.npmjs.org/undici/-/undici-7.24.6.tgz",
+			"integrity": "sha512-Xi4agocCbRzt0yYMZGMA6ApD7gvtUFaxm4ZmeacWI4cZxaF6C+8I8QfofC20NAePiB/IcvZmzkJ7XPa471AEtA==",
+			"dev": true,
+			"license": "MIT",
+			"engines": {
+				"node": ">=20.18.1"
+			}
+		},
 		"node_modules/undici-types": {
 			"version": "7.16.0",
 			"resolved": "https://registry.npmjs.org/undici-types/-/undici-types-7.16.0.tgz",
@@ -14277,6 +14978,19 @@
 				}
 			}
 		},
+		"node_modules/w3c-xmlserializer": {
+			"version": "5.0.0",
+			"resolved": "https://registry.npmjs.org/w3c-xmlserializer/-/w3c-xmlserializer-5.0.0.tgz",
+			"integrity": "sha512-o8qghlI8NZHU1lLPrpi2+Uq7abh4GGPpYANlalzWxyWteJOCsr/P+oPBA49TOLu5FTZO4d3F9MnWJfiMo4BkmA==",
+			"dev": true,
+			"license": "MIT",
+			"dependencies": {
+				"xml-name-validator": "^5.0.0"
+			},
+			"engines": {
+				"node": ">=18"
+			}
+		},
 		"node_modules/wcwidth": {
 			"version": "1.0.1",
 			"resolved": "https://registry.npmjs.org/wcwidth/-/wcwidth-1.0.1.tgz",
@@ -14296,6 +15010,41 @@
 				"pnpm": ">=8"
 			}
 		},
+		"node_modules/webidl-conversions": {
+			"version": "8.0.1",
+			"resolved": "https://registry.npmjs.org/webidl-conversions/-/webidl-conversions-8.0.1.tgz",
+			"integrity": "sha512-BMhLD/Sw+GbJC21C/UgyaZX41nPt8bUTg+jWyDeg7e7YN4xOM05YPSIXceACnXVtqyEw/LMClUQMtMZ+PGGpqQ==",
+			"dev": true,
+			"license": "BSD-2-Clause",
+			"engines": {
+				"node": ">=20"
+			}
+		},
+		"node_modules/whatwg-mimetype": {
+			"version": "5.0.0",
+			"resolved": "https://registry.npmjs.org/whatwg-mimetype/-/whatwg-mimetype-5.0.0.tgz",
+			"integrity": "sha512-sXcNcHOC51uPGF0P/D4NVtrkjSU2fNsm9iog4ZvZJsL3rjoDAzXZhkm2MWt1y+PUdggKAYVoMAIYcs78wJ51Cw==",
+			"dev": true,
+			"license": "MIT",
+			"engines": {
+				"node": ">=20"
+			}
+		},
+		"node_modules/whatwg-url": {
+			"version": "16.0.1",
+			"resolved": "https://registry.npmjs.org/whatwg-url/-/whatwg-url-16.0.1.tgz",
+			"integrity": "sha512-1to4zXBxmXHV3IiSSEInrreIlu02vUOvrhxJJH5vcxYTBDAx51cqZiKdyTxlecdKNSjj8EcxGBxNf6Vg+945gw==",
+			"dev": true,
+			"license": "MIT",
+			"dependencies": {
+				"@exodus/bytes": "^1.11.0",
+				"tr46": "^6.0.0",
+				"webidl-conversions": "^8.0.1"
+			},
+			"engines": {
+				"node": "^20.19.0 || ^22.12.0 || >=24.0.0"
+			}
+		},
 		"node_modules/which": {
 			"version": "2.0.2",
 			"resolved": "https://registry.npmjs.org/which/-/which-2.0.2.tgz",
@@ -14401,6 +15150,16 @@
 				"xtend": "^4.0.0"
 			}
 		},
+		"node_modules/xml-name-validator": {
+			"version": "5.0.0",
+			"resolved": "https://registry.npmjs.org/xml-name-validator/-/xml-name-validator-5.0.0.tgz",
+			"integrity": "sha512-EvGK8EJ3DhaHfbRlETOWAS5pO9MZITeauHKJyb8wyajUfQUenkIg2MvLDTZ4T/TgIcm3HU0TFBgWWboAZ30UHg==",
+			"dev": true,
+			"license": "Apache-2.0",
+			"engines": {
+				"node": ">=18"
+			}
+		},
 		"node_modules/xml-parse-from-string": {
 			"version": "1.0.1",
 			"resolved": "https://registry.npmjs.org/xml-parse-from-string/-/xml-parse-from-string-1.0.1.tgz",
@@ -14442,6 +15201,13 @@
 				"node": ">=8.0"
 			}
 		},
+		"node_modules/xmlchars": {
+			"version": "2.2.0",
+			"resolved": "https://registry.npmjs.org/xmlchars/-/xmlchars-2.2.0.tgz",
+			"integrity": "sha512-JZnDKK8B0RCDw84FNdDAIpZK+JuJw+s7Lz8nksI7SIuU3UXJJslUthsi+uWBUYOwPFwW7W7PRLRfUKpxjtjFCw==",
+			"dev": true,
+			"license": "MIT"
+		},
 		"node_modules/xtend": {
 			"version": "4.0.2",
 			"resolved": "https://registry.npmjs.org/xtend/-/xtend-4.0.2.tgz",

package.json

@@ -1,14 +1,20 @@
 {
 	"name": "openscreen",
 	"private": true,
-	"version": "1.2.0",
+	"version": "1.3.0",
 	"type": "module",
+	"packageManager": "npm@10.9.4",
+	"engines": {
+		"node": "22.22.1",
+		"npm": "10.9.4"
+	},
 	"scripts": {
 		"dev": "vite",
 		"build": "tsc && vite build && electron-builder",
 		"lint": "biome check .",
 		"lint:fix": "biome check --write .",
 		"format": "biome format --write .",
+		"i18n:check": "node scripts/i18n-check.mjs",
 		"preview": "vite preview",
 		"build:mac": "tsc && vite build && electron-builder --mac",
 		"build:win": "tsc && vite build && electron-builder --win",
@@ -64,6 +70,9 @@
 	"devDependencies": {
 		"@biomejs/biome": "^2.3.13",
 		"@playwright/test": "^1.58.2",
+		"@testing-library/jest-dom": "^6.9.1",
+		"@testing-library/react": "^16.3.2",
+		"@testing-library/user-event": "^14.6.1",
 		"@types/node": "^25.0.3",
 		"@types/react": "^18.2.64",
 		"@types/react-dom": "^18.2.21",
@@ -76,6 +85,7 @@
 		"electron-rebuild": "^3.2.9",
 		"fast-check": "^4.5.2",
 		"husky": "^9.1.7",
+		"jsdom": "^29.0.1",
 		"lint-staged": "^16.3.2",
 		"postcss": "^8.5.6",
 		"tailwindcss": "^3.4.18",

scripts/i18n-check.mjs

@@ -0,0 +1,82 @@
+#!/usr/bin/env node
+/**
+ * Validates that all locale translation files have identical key structures.
+ * Compares zh-CN and es against the en baseline for every namespace.
+ *
+ * Usage: node scripts/i18n-check.mjs
+ */
+
+import fs from "node:fs";
+import path from "node:path";
+
+const LOCALES_DIR = path.resolve("src/i18n/locales");
+const BASE_LOCALE = "en";
+const COMPARE_LOCALES = ["zh-CN", "es"];
+
+function getKeys(obj, prefix = "") {
+	const keys = [];
+	for (const [key, value] of Object.entries(obj)) {
+		const fullKey = prefix ? `${prefix}.${key}` : key;
+		if (value && typeof value === "object" && !Array.isArray(value)) {
+			keys.push(...getKeys(value, fullKey));
+		} else {
+			keys.push(fullKey);
+		}
+	}
+	return keys.sort();
+}
+
+let hasErrors = false;
+
+const baseDir = path.join(LOCALES_DIR, BASE_LOCALE);
+const namespaces = fs
+	.readdirSync(baseDir)
+	.filter((f) => f.endsWith(".json"))
+	.map((f) => f.replace(".json", ""));
+
+for (const namespace of namespaces) {
+	const basePath = path.join(baseDir, `${namespace}.json`);
+	const baseData = JSON.parse(fs.readFileSync(basePath, "utf-8"));
+	const baseKeys = getKeys(baseData);
+
+	for (const locale of COMPARE_LOCALES) {
+		const localePath = path.join(LOCALES_DIR, locale, `${namespace}.json`);
+
+		if (!fs.existsSync(localePath)) {
+			console.error(`MISSING: ${locale}/${namespace}.json does not exist`);
+			hasErrors = true;
+			continue;
+		}
+
+		const localeData = JSON.parse(fs.readFileSync(localePath, "utf-8"));
+		const localeKeys = getKeys(localeData);
+
+		const missing = baseKeys.filter((k) => !localeKeys.includes(k));
+		const extra = localeKeys.filter((k) => !baseKeys.includes(k));
+
+		if (missing.length > 0) {
+			console.error(`MISSING in ${locale}/${namespace}.json:`);
+			for (const key of missing) {
+				console.error(`  - ${key}`);
+			}
+			hasErrors = true;
+		}
+
+		if (extra.length > 0) {
+			console.error(`EXTRA in ${locale}/${namespace}.json:`);
+			for (const key of extra) {
+				console.error(`  + ${key}`);
+			}
+			hasErrors = true;
+		}
+	}
+}
+
+if (hasErrors) {
+	console.error("\ni18n check FAILED — translation files are out of sync.");
+	process.exit(1);
+} else {
+	console.log(
+		`i18n check PASSED — all ${COMPARE_LOCALES.length} locales match ${BASE_LOCALE} across ${namespaces.length} namespaces.`,
+	);
+}

src/App.tsx

@@ -1,6 +1,7 @@
 import { useEffect, useState } from "react";
 import { LaunchWindow } from "./components/launch/LaunchWindow";
 import { SourceSelector } from "./components/launch/SourceSelector";
+import { Toaster } from "./components/ui/sonner";
 import { TooltipProvider } from "./components/ui/tooltip";
 import { ShortcutsConfigDialog } from "./components/video-editor/ShortcutsConfigDialog";
 import VideoEditor from "./components/video-editor/VideoEditor";
@@ -48,5 +49,10 @@ export default function App() {
 		}
 	})();
 
-	return <TooltipProvider>{content}</TooltipProvider>;
+	return (
+		<TooltipProvider>
+			{content}
+			<Toaster theme="dark" className="pointer-events-auto" />
+		</TooltipProvider>
+	);
 }

src/components/launch/LaunchWindow.tsx

@@ -1,10 +1,11 @@
-import { ChevronDown } from "lucide-react";
+import { ChevronDown, Languages } from "lucide-react";
 import { useEffect, useState } from "react";
-import { BsRecordCircle } from "react-icons/bs";
+import { BsPauseCircle, BsPlayCircle, BsRecordCircle } from "react-icons/bs";
 import { FaRegStopCircle } from "react-icons/fa";
 import { FaFolderOpen } from "react-icons/fa6";
 import { FiMinus, FiX } from "react-icons/fi";
 import {
+	MdCancel,
 	MdMic,
 	MdMicOff,
 	MdMonitor,
@@ -16,9 +17,15 @@ import {
 	MdVolumeUp,
 } from "react-icons/md";
 import { RxDragHandleDots2 } from "react-icons/rx";
+import { useI18n, useScopedT } from "@/contexts/I18nContext";
+import { type Locale, SUPPORTED_LOCALES } from "@/i18n/config";
+import { getLocaleName } from "@/i18n/loader";
+import { isMac as getIsMac } from "@/utils/platformUtils";
 import { useAudioLevelMeter } from "../../hooks/useAudioLevelMeter";
+import { useCameraDevices } from "../../hooks/useCameraDevices";
 import { useMicrophoneDevices } from "../../hooks/useMicrophoneDevices";
 import { useScreenRecorder } from "../../hooks/useScreenRecorder";
+import { requestCameraAccess } from "../../lib/requestCameraAccess";
 import { formatTimePadded } from "../../utils/timeUtils";
 import { AudioLevelMeter } from "../ui/audio-level-meter";
 import { Tooltip } from "../ui/tooltip";
@@ -35,8 +42,11 @@ const ICON_CONFIG = {
 	micOff: { icon: MdMicOff, size: ICON_SIZE },
 	webcamOn: { icon: MdVideocam, size: ICON_SIZE },
 	webcamOff: { icon: MdVideocamOff, size: ICON_SIZE },
+	pause: { icon: BsPauseCircle, size: ICON_SIZE },
+	resume: { icon: BsPlayCircle, size: ICON_SIZE },
 	stop: { icon: FaRegStopCircle, size: ICON_SIZE },
 	restart: { icon: MdRestartAlt, size: ICON_SIZE },
+	cancel: { icon: MdCancel, size: ICON_SIZE },
 	record: { icon: BsRecordCircle, size: ICON_SIZE },
 	videoFile: { icon: MdVideoFile, size: ICON_SIZE },
 	folder: { icon: FaFolderOpen, size: ICON_SIZE },
@@ -61,10 +71,22 @@ const windowBtnClasses =
 	"flex items-center justify-center p-2 rounded-full transition-all duration-150 cursor-pointer opacity-50 hover:opacity-90 hover:bg-white/[0.08]";
 
 export function LaunchWindow() {
+	const t = useScopedT("launch");
+	const { locale, setLocale } = useI18n();
+	const [isMac, setIsMac] = useState(false);
+
+	useEffect(() => {
+		getIsMac().then(setIsMac);
+	}, []);
+
 	const {
 		recording,
+		paused,
+		elapsedSeconds,
 		toggleRecording,
+		togglePaused,
 		restartRecording,
+		cancelRecording,
 		microphoneEnabled,
 		setMicrophoneEnabled,
 		microphoneDeviceId,
@@ -73,42 +95,72 @@ export function LaunchWindow() {
 		setSystemAudioEnabled,
 		webcamEnabled,
 		setWebcamEnabled,
+		webcamDeviceId,
+		setWebcamDeviceId,
 	} = useScreenRecorder();
-	const [recordingStart, setRecordingStart] = useState<number | null>(null);
-	const [elapsed, setElapsed] = useState(0);
 
 	const showMicControls = microphoneEnabled && !recording;
-	const { devices, selectedDeviceId, setSelectedDeviceId } =
-		useMicrophoneDevices(microphoneEnabled);
+	const showWebcamControls = webcamEnabled && !recording;
+
+	const [isMicHovered, setIsMicHovered] = useState(false);
+	const [isMicFocused, setIsMicFocused] = useState(false);
+	const micExpanded = isMicHovered || isMicFocused;
+
+	const [isWebcamHovered, setIsWebcamHovered] = useState(false);
+	const [isWebcamFocused, setIsWebcamFocused] = useState(false);
+	const webcamExpanded = isWebcamHovered || isWebcamFocused;
+
+	const {
+		devices: micDevices,
+		selectedDeviceId: selectedMicId,
+		setSelectedDeviceId: setSelectedMicId,
+	} = useMicrophoneDevices(microphoneEnabled);
+	const {
+		devices: cameraDevices,
+		selectedDeviceId: selectedCameraId,
+		setSelectedDeviceId: setSelectedCameraId,
+		isLoading: isCameraDevicesLoading,
+		error: cameraDevicesError,
+	} = useCameraDevices(webcamEnabled);
+
+	const selectedMicLabel =
+		micDevices.find((d) => d.deviceId === (microphoneDeviceId || selectedMicId))?.label ||
+		t("audio.defaultMicrophone");
+	const selectedCameraLabel = isCameraDevicesLoading
+		? t("webcam.searching")
+		: cameraDevicesError
+			? t("webcam.unavailable")
+			: cameraDevices.length === 0
+				? t("webcam.noneFound")
+				: cameraDevices.find((d) => d.deviceId === (webcamDeviceId || selectedCameraId))?.label ||
+					t("webcam.defaultCamera");
+
 	const { level } = useAudioLevelMeter({
 		enabled: showMicControls,
 		deviceId: microphoneDeviceId,
 	});
 
 	useEffect(() => {
-		if (selectedDeviceId && selectedDeviceId !== "default") {
-			setMicrophoneDeviceId(selectedDeviceId);
+		if (selectedMicId && selectedMicId !== "default") {
+			setMicrophoneDeviceId(selectedMicId);
 		}
-	}, [selectedDeviceId, setMicrophoneDeviceId]);
+	}, [selectedMicId, setMicrophoneDeviceId]);
 
 	useEffect(() => {
-		let timer: NodeJS.Timeout | null = null;
-		if (recording) {
-			if (!recordingStart) setRecordingStart(Date.now());
-			timer = setInterval(() => {
-				if (recordingStart) {
-					setElapsed(Math.floor((Date.now() - recordingStart) / 1000));
-				}
-			}, 1000);
-		} else {
-			setRecordingStart(null);
-			setElapsed(0);
-			if (timer) clearInterval(timer);
+		if (selectedCameraId) {
+			setWebcamDeviceId(selectedCameraId);
 		}
-		return () => {
-			if (timer) clearInterval(timer);
-		};
-	}, [recording, recordingStart]);
+	}, [selectedCameraId, setWebcamDeviceId]);
+
+	useEffect(() => {
+		if (!import.meta.env.DEV) {
+			return;
+		}
+
+		void requestCameraAccess().catch((error) => {
+			console.warn("Failed to trigger camera access request during development:", error);
+		});
+	}, []);
 
 	const [selectedSource, setSelectedSource] = useState("Screen");
 	const [hasSelectedSource, setHasSelectedSource] = useState(false);
@@ -176,156 +228,309 @@ export function LaunchWindow() {
 	};
 
 	return (
-		<div className="w-full h-full flex items-end justify-center bg-transparent">
-			<div className={`flex flex-col items-center gap-2 mx-auto ${styles.electronDrag}`}>
-				{/* Mic controls panel */}
-				{showMicControls && (
-					<div
-						className={`flex items-center gap-2 px-4 py-2 bg-gradient-to-br from-[rgba(28,28,36,0.97)] to-[rgba(18,18,26,0.96)] backdrop-blur-[16px] backdrop-saturate-[140%] border border-[rgba(80,80,120,0.25)] rounded-2xl shadow-mic-panel animate-mic-panel-in ${styles.electronNoDrag}`}
-					>
-						<div className="relative flex-1" style={{ maxWidth: "70%" }}>
-							<select
-								value={microphoneDeviceId || selectedDeviceId}
-								onChange={(e) => {
-									setSelectedDeviceId(e.target.value);
-									setMicrophoneDeviceId(e.target.value);
-								}}
-								className="w-full appearance-none bg-white/10 text-white text-xs rounded-full pl-3 pr-7 py-2 border border-white/20 outline-none truncate"
-							>
-								{devices.map((device) => (
-									<option key={device.deviceId} value={device.deviceId}>
-										{device.label}
-									</option>
-								))}
-							</select>
-							<ChevronDown
-								size={14}
-								className="absolute right-2 top-1/2 -translate-y-1/2 text-white/60 pointer-events-none"
+		<div className={`w-screen h-screen bg-transparent ${styles.electronDrag}`}>
+			{/* Language switcher — top-left, beside traffic lights */}
+			<div
+				className={`fixed top-2 flex items-center gap-1 px-2 py-1 rounded-md text-white/50 hover:text-white/90 hover:bg-white/10 transition-all duration-150 ${isMac ? "left-[72px]" : "left-2"} ${styles.electronNoDrag}`}
+			>
+				<Languages size={14} />
+				<select
+					value={locale}
+					onChange={(e) => setLocale(e.target.value as Locale)}
+					className="bg-transparent text-[11px] font-medium outline-none cursor-pointer appearance-none pr-1"
+					style={{ color: "inherit" }}
+				>
+					{SUPPORTED_LOCALES.map((loc) => (
+						<option key={loc} value={loc} className="bg-[#1c1c24] text-white">
+							{getLocaleName(loc)}
+						</option>
+					))}
+				</select>
+			</div>
+
+			{/* Device selectors — fixed above HUD bar, viewport-relative, never clipped */}
+			{(showMicControls || showWebcamControls) && (
+				<div
+					className={`fixed bottom-[60px] left-1/2 -translate-x-1/2 flex items-center gap-2 animate-mic-panel-in ${styles.electronNoDrag}`}
+				>
+					{/* Mic selector */}
+					{showMicControls && (
+						<div
+							className={`flex items-center gap-2 px-3 py-1.5 h-[36px] bg-gradient-to-br from-[rgba(28,28,36,0.97)] to-[rgba(18,18,26,0.96)] backdrop-blur-[24px] border border-white/10 rounded-xl shadow-2xl transition-all duration-300 overflow-hidden ${!micExpanded ? "opacity-60 grayscale-[0.5]" : "opacity-100"}`}
+							onMouseEnter={() => setIsMicHovered(true)}
+							onMouseLeave={() => setIsMicHovered(false)}
+							onFocus={() => setIsMicFocused(true)}
+							onBlur={() => setIsMicFocused(false)}
+							style={{ width: micExpanded ? "240px" : "140px", transition: "width 300ms ease" }}
+						>
+							<div className="relative flex-1 min-w-0">
+								{!micExpanded && (
+									<div className="text-white/60 text-[10px] font-medium truncate">
+										{selectedMicLabel}
+									</div>
+								)}
+								<select
+									value={microphoneDeviceId || selectedMicId}
+									onChange={(e) => {
+										setSelectedMicId(e.target.value);
+										setMicrophoneDeviceId(e.target.value);
+									}}
+									className={`w-full appearance-none bg-white/5 text-white text-[11px] rounded-lg pl-2 pr-6 py-1 border border-white/10 outline-none hover:bg-white/10 transition-colors cursor-pointer ${!micExpanded ? "sr-only" : ""}`}
+								>
+									{micDevices.map((device) => (
+										<option key={device.deviceId} value={device.deviceId} className="bg-[#1c1c24]">
+											{device.label}
+										</option>
+									))}
+								</select>
+								{micExpanded && (
+									<ChevronDown
+										size={12}
+										className="absolute right-1.5 top-1/2 -translate-y-1/2 text-white/40 pointer-events-none"
+									/>
+								)}
+							</div>
+							<AudioLevelMeter
+								level={level}
+								className={`${micExpanded ? "w-16" : "w-8"} h-2 transition-all duration-300`}
 							/>
 						</div>
-						<AudioLevelMeter level={level} className="w-24 h-4" />
-					</div>
-				)}
-
-				{/* Main pill bar */}
-				<div className="flex items-center gap-1.5 px-2 py-1.5 isolate rounded-full shadow-hud-bar bg-gradient-to-br from-[rgba(28,28,36,0.97)] to-[rgba(18,18,26,0.96)] backdrop-blur-[16px] backdrop-saturate-[140%] border border-[rgba(80,80,120,0.25)]">
-					{/* Drag handle */}
-					<div className={`flex items-center px-1 ${styles.electronDrag}`}>
-						{getIcon("drag", "text-white/30")}
-					</div>
-
-					{/* Source selector */}
-					<button
-						className={`${hudGroupClasses} p-2 ${styles.electronNoDrag}`}
-						onClick={openSourceSelector}
-						disabled={recording}
-						title={selectedSource}
-					>
-						{getIcon("monitor", "text-white/80")}
-						<span className="text-white/70 text-[11px] max-w-[72px] truncate">
-							{selectedSource}
-						</span>
-					</button>
-
-					{/* Audio controls group */}
-					<div className={`${hudGroupClasses} ${styles.electronNoDrag}`}>
-						<button
-							className={`${hudIconBtnClasses} ${systemAudioEnabled ? "drop-shadow-[0_0_4px_rgba(74,222,128,0.4)]" : ""}`}
-							onClick={() => !recording && setSystemAudioEnabled(!systemAudioEnabled)}
-							disabled={recording}
-							title={systemAudioEnabled ? "Disable system audio" : "Enable system audio"}
-						>
-							{systemAudioEnabled
-								? getIcon("volumeOn", "text-green-400")
-								: getIcon("volumeOff", "text-white/40")}
-						</button>
-						<button
-							className={`${hudIconBtnClasses} ${microphoneEnabled ? "drop-shadow-[0_0_4px_rgba(74,222,128,0.4)]" : ""}`}
-							onClick={toggleMicrophone}
-							disabled={recording}
-							title={microphoneEnabled ? "Disable microphone" : "Enable microphone"}
-						>
-							{microphoneEnabled
-								? getIcon("micOn", "text-green-400")
-								: getIcon("micOff", "text-white/40")}
-						</button>
-						<button
-							className={`${hudIconBtnClasses} ${webcamEnabled ? "drop-shadow-[0_0_4px_rgba(74,222,128,0.4)]" : ""}`}
-							onClick={() => {
-								void setWebcamEnabled(!webcamEnabled);
-							}}
-							title={webcamEnabled ? "Disable webcam" : "Enable webcam"}
-						>
-							{webcamEnabled
-								? getIcon("webcamOn", "text-green-400")
-								: getIcon("webcamOff", "text-white/40")}
-						</button>
-					</div>
-
-					{/* Record/Stop group */}
-					<button
-						className={`flex items-center gap-0.5 rounded-full p-2 transition-colors duration-150 ${styles.electronNoDrag} ${
-							recording ? "animate-record-pulse bg-red-500/10" : "bg-white/5 hover:bg-white/[0.08]"
-						}`}
-						onClick={hasSelectedSource ? toggleRecording : openSourceSelector}
-						disabled={!hasSelectedSource && !recording}
-						style={{ flex: "0 0 auto" }}
-					>
-						{recording ? (
-							<>
-								{getIcon("stop", "text-red-400")}
-								<span className="text-red-400 text-xs font-semibold tabular-nums">
-									{formatTimePadded(elapsed)}
-								</span>
-							</>
-						) : (
-							getIcon("record", hasSelectedSource ? "text-white/80" : "text-white/30")
-						)}
-					</button>
-
-					{/* Restart recording */}
-					{recording && (
-						<Tooltip content="Restart recording">
-							<button
-								className={`${hudIconBtnClasses} ${styles.electronNoDrag}`}
-								onClick={restartRecording}
-							>
-								{getIcon("restart", "text-white/60")}
-							</button>
-						</Tooltip>
 					)}
 
-					{/* Open video file */}
-					<Tooltip content="Open video file">
+					{/* Webcam selector */}
+					{showWebcamControls && (
+						<div
+							className={`flex items-center gap-2 px-3 py-1.5 h-[36px] bg-gradient-to-br from-[rgba(28,28,36,0.97)] to-[rgba(18,18,26,0.96)] backdrop-blur-[24px] border border-white/10 rounded-xl shadow-2xl transition-all duration-300 overflow-hidden ${!webcamExpanded ? "opacity-60 grayscale-[0.5]" : "opacity-100"}`}
+							onMouseEnter={() => setIsWebcamHovered(true)}
+							onMouseLeave={() => setIsWebcamHovered(false)}
+							onFocus={() => setIsWebcamFocused(true)}
+							onBlur={() => setIsWebcamFocused(false)}
+							style={{ width: webcamExpanded ? "240px" : "140px", transition: "width 300ms ease" }}
+						>
+							<div className="relative flex-1 min-w-0">
+								{!webcamExpanded && (
+									<div className="text-white/60 text-[10px] font-medium truncate">
+										{selectedCameraLabel}
+									</div>
+								)}
+								{webcamExpanded &&
+									(isCameraDevicesLoading ? (
+										<span className="text-white/40 text-[10px] italic">
+											{t("webcam.searching")}
+										</span>
+									) : cameraDevicesError ? (
+										<span className="text-white/40 text-[10px] italic">
+											{t("webcam.unavailable")}
+										</span>
+									) : cameraDevices.length === 0 ? (
+										<span className="text-white/40 text-[10px] italic">
+											{t("webcam.noneFound")}
+										</span>
+									) : (
+										<>
+											<select
+												value={webcamDeviceId || selectedCameraId}
+												onChange={(e) => {
+													setSelectedCameraId(e.target.value);
+													setWebcamDeviceId(e.target.value);
+												}}
+												className="w-full appearance-none bg-white/5 text-white text-[11px] rounded-lg pl-2 pr-6 py-1 border border-white/10 outline-none hover:bg-white/10 transition-colors cursor-pointer"
+											>
+												{cameraDevices.map((device) => (
+													<option
+														key={device.deviceId}
+														value={device.deviceId}
+														className="bg-[#1c1c24]"
+													>
+														{device.label}
+													</option>
+												))}
+											</select>
+											<ChevronDown
+												size={12}
+												className="absolute right-1.5 top-1/2 -translate-y-1/2 text-white/40 pointer-events-none"
+											/>
+										</>
+									))}
+								{(!webcamExpanded || cameraDevices.length === 0) && (
+									<select
+										value={webcamDeviceId || selectedCameraId}
+										onChange={(e) => {
+											setSelectedCameraId(e.target.value);
+											setWebcamDeviceId(e.target.value);
+										}}
+										className="sr-only"
+									>
+										{cameraDevices.map((device) => (
+											<option key={device.deviceId} value={device.deviceId}>
+												{device.label}
+											</option>
+										))}
+									</select>
+								)}
+							</div>
+						</div>
+					)}
+				</div>
+			)}
+
+			{/* HUD bar — fixed at bottom center, viewport-relative, never moves */}
+			<div
+				className={`fixed bottom-4 left-1/2 -translate-x-1/2 flex items-center gap-1.5 px-2 py-1.5 rounded-full shadow-hud-bar bg-gradient-to-br from-[rgba(28,28,36,0.97)] to-[rgba(18,18,26,0.96)] backdrop-blur-[16px] backdrop-saturate-[140%] border border-[rgba(80,80,120,0.25)]`}
+			>
+				{/* Drag handle */}
+				<div className={`flex items-center px-1 ${styles.electronDrag}`}>
+					{getIcon("drag", "text-white/30")}
+				</div>
+
+				{/* Source selector */}
+				<button
+					className={`${hudGroupClasses} p-2 ${styles.electronNoDrag}`}
+					onClick={openSourceSelector}
+					disabled={recording}
+					title={selectedSource}
+				>
+					{getIcon("monitor", "text-white/80")}
+					<span className="text-white/70 text-[11px] max-w-[72px] truncate">{selectedSource}</span>
+				</button>
+
+				{/* Audio controls group */}
+				<div className={`${hudGroupClasses} ${styles.electronNoDrag}`}>
+					<button
+						className={`${hudIconBtnClasses} ${systemAudioEnabled ? "drop-shadow-[0_0_4px_rgba(74,222,128,0.4)]" : ""}`}
+						onClick={() => !recording && setSystemAudioEnabled(!systemAudioEnabled)}
+						disabled={recording}
+						title={
+							systemAudioEnabled ? t("audio.disableSystemAudio") : t("audio.enableSystemAudio")
+						}
+					>
+						{systemAudioEnabled
+							? getIcon("volumeOn", "text-green-400")
+							: getIcon("volumeOff", "text-white/40")}
+					</button>
+					<button
+						className={`${hudIconBtnClasses} ${microphoneEnabled ? "drop-shadow-[0_0_4px_rgba(74,222,128,0.4)]" : ""}`}
+						onClick={toggleMicrophone}
+						disabled={recording}
+						title={microphoneEnabled ? t("audio.disableMicrophone") : t("audio.enableMicrophone")}
+					>
+						{microphoneEnabled
+							? getIcon("micOn", "text-green-400")
+							: getIcon("micOff", "text-white/40")}
+					</button>
+					<button
+						className={`${hudIconBtnClasses} ${webcamEnabled ? "drop-shadow-[0_0_4px_rgba(74,222,128,0.4)]" : ""}`}
+						onClick={async () => {
+							await setWebcamEnabled(!webcamEnabled);
+						}}
+						title={webcamEnabled ? t("webcam.disableWebcam") : t("webcam.enableWebcam")}
+					>
+						{webcamEnabled
+							? getIcon("webcamOn", "text-green-400")
+							: getIcon("webcamOff", "text-white/40")}
+					</button>
+				</div>
+
+				{/* Record/Stop group */}
+				<button
+					className={`flex items-center gap-0.5 rounded-full p-2 transition-colors duration-150 ${styles.electronNoDrag} ${
+						recording
+							? paused
+								? "bg-amber-500/10 hover:bg-amber-500/15"
+								: "animate-record-pulse bg-red-500/10"
+							: "bg-white/5 hover:bg-white/[0.08]"
+					}`}
+					onClick={toggleRecording}
+					disabled={!hasSelectedSource && !recording}
+					style={{ flex: "0 0 auto" }}
+				>
+					{recording ? (
+						<>
+							{getIcon("stop", paused ? "text-amber-400" : "text-red-400")}
+							<span
+								className={`${paused ? "text-amber-400" : "text-red-400"} text-xs font-semibold tabular-nums`}
+							>
+								{formatTimePadded(elapsedSeconds)}
+							</span>
+						</>
+					) : (
+						getIcon("record", hasSelectedSource ? "text-white/80" : "text-white/30")
+					)}
+				</button>
+
+				{recording && (
+					<Tooltip content={paused ? t("tooltips.resumeRecording") : t("tooltips.pauseRecording")}>
 						<button
 							className={`${hudIconBtnClasses} ${styles.electronNoDrag}`}
-							onClick={openVideoFile}
-							disabled={recording}
+							onClick={togglePaused}
 						>
-							{getIcon("videoFile", "text-white/60")}
+							{getIcon(paused ? "resume" : "pause", paused ? "text-amber-400" : "text-white/60")}
 						</button>
 					</Tooltip>
+				)}
 
-					{/* Open project */}
-					<Tooltip content="Open project">
+				{/* Restart recording */}
+				{recording && (
+					<Tooltip content={t("tooltips.restartRecording")}>
 						<button
 							className={`${hudIconBtnClasses} ${styles.electronNoDrag}`}
-							onClick={openProjectFile}
-							disabled={recording}
+							onClick={restartRecording}
 						>
-							{getIcon("folder", "text-white/60")}
+							{getIcon("restart", "text-white/60")}
 						</button>
 					</Tooltip>
+				)}
 
-					{/* Window controls */}
-					<div className={`flex items-center gap-0.5 ${styles.electronNoDrag}`}>
-						<button className={windowBtnClasses} title="Hide HUD" onClick={sendHudOverlayHide}>
-							{getIcon("minimize", "text-white")}
+				{/* Cancel recording */}
+				{recording && (
+					<Tooltip content={t("tooltips.cancelRecording")}>
+						<button
+							className={`${hudIconBtnClasses} ${styles.electronNoDrag}`}
+							onClick={cancelRecording}
+						>
+							{getIcon("cancel", "text-white/60")}
 						</button>
-						<button className={windowBtnClasses} title="Close App" onClick={sendHudOverlayClose}>
-							{getIcon("close", "text-white")}
-						</button>
-					</div>
+					</Tooltip>
+				)}
+
+				{/* Open video file */}
+				<Tooltip content={t("tooltips.openVideoFile")}>
+					<button
+						className={`${hudIconBtnClasses} ${styles.electronNoDrag}`}
+						onClick={openVideoFile}
+						disabled={recording}
+					>
+						{getIcon("videoFile", "text-white/60")}
+					</button>
+				</Tooltip>
+
+				{/* Open project */}
+				<Tooltip content={t("tooltips.openProject")}>
+					<button
+						className={`${hudIconBtnClasses} ${styles.electronNoDrag}`}
+						onClick={openProjectFile}
+						disabled={recording}
+					>
+						{getIcon("folder", "text-white/60")}
+					</button>
+				</Tooltip>
+
+				{/* Window controls */}
+				<div className={`flex items-center gap-0.5 ${styles.electronNoDrag}`}>
+					<button
+						className={windowBtnClasses}
+						title={t("tooltips.hideHUD")}
+						onClick={sendHudOverlayHide}
+					>
+						{getIcon("minimize", "text-white")}
+					</button>
+					<button
+						className={windowBtnClasses}
+						title={t("tooltips.closeApp")}
+						onClick={sendHudOverlayClose}
+					>
+						{getIcon("close", "text-white")}
+					</button>
 				</div>
 			</div>
 		</div>

src/components/launch/SourceSelector.tsx

@@ -1,5 +1,6 @@
 import { useEffect, useState } from "react";
 import { MdCheck } from "react-icons/md";
+import { useScopedT } from "@/contexts/I18nContext";
 import { Button } from "../ui/button";
 import { Tabs, TabsContent, TabsList, TabsTrigger } from "../ui/tabs";
 import styles from "./SourceSelector.module.css";
@@ -13,6 +14,8 @@ interface DesktopSource {
 }
 
 export function SourceSelector() {
+	const t = useScopedT("launch");
+	const tc = useScopedT("common");
 	const [sources, setSources] = useState<DesktopSource[]>([]);
 	const [selectedSource, setSelectedSource] = useState<DesktopSource | null>(null);
 	const [loading, setLoading] = useState(true);
@@ -63,7 +66,7 @@ export function SourceSelector() {
 			>
 				<div className="text-center">
 					<div className="animate-spin rounded-full h-6 w-6 border-b-2 border-[#34B27B] mx-auto mb-2" />
-					<p className="text-xs text-zinc-400">Loading sources...</p>
+					<p className="text-xs text-zinc-400">{t("sourceSelector.loading")}</p>
 				</div>
 			</div>
 		);
@@ -113,13 +116,13 @@ export function SourceSelector() {
 							value="screens"
 							className="data-[state=active]:bg-white/15 data-[state=active]:text-white text-zinc-400 rounded-full text-xs py-1 transition-all"
 						>
-							Screens ({screenSources.length})
+							{t("sourceSelector.screens", { count: String(screenSources.length) })}
 						</TabsTrigger>
 						<TabsTrigger
 							value="windows"
 							className="data-[state=active]:bg-white/15 data-[state=active]:text-white text-zinc-400 rounded-full text-xs py-1 transition-all"
 						>
-							Windows ({windowSources.length})
+							{t("sourceSelector.windows", { count: String(windowSources.length) })}
 						</TabsTrigger>
 					</TabsList>
 					<div className="flex-1 min-h-0">
@@ -146,14 +149,14 @@ export function SourceSelector() {
 					onClick={() => window.close()}
 					className="px-5 py-1 text-xs text-zinc-400 hover:text-white hover:bg-white/5 rounded-full"
 				>
-					Cancel
+					{tc("actions.cancel")}
 				</Button>
 				<Button
 					onClick={handleShare}
 					disabled={!selectedSource}
 					className="px-5 py-1 text-xs bg-[#34B27B] text-white hover:bg-[#34B27B]/80 disabled:opacity-30 disabled:bg-zinc-700 rounded-full"
 				>
-					Share
+					{tc("actions.share")}
 				</Button>
 			</div>
 		</div>

src/components/video-editor/AddCustomFontDialog.tsx

@@ -12,6 +12,7 @@ import {
 } from "@/components/ui/dialog";
 import { Input } from "@/components/ui/input";
 import { Label } from "@/components/ui/label";
+import { useScopedT } from "@/contexts/I18nContext";
 import {
 	addCustomFont,
 	type CustomFont,
@@ -25,6 +26,8 @@ interface AddCustomFontDialogProps {
 }
 
 export function AddCustomFontDialog({ onFontAdded }: AddCustomFontDialogProps) {
+	const t = useScopedT("settings");
+	const tc = useScopedT("common");
 	const [open, setOpen] = useState(false);
 	const [importUrl, setImportUrl] = useState("");
 	const [fontName, setFontName] = useState("");
@@ -45,17 +48,17 @@ export function AddCustomFontDialog({ onFontAdded }: AddCustomFontDialogProps) {
 	const handleAdd = async () => {
 		// Validate inputs
 		if (!importUrl.trim()) {
-			toast.error("Please enter a Google Fonts import URL");
+			toast.error(t("customFont.errorEmptyUrl"));
 			return;
 		}
 
 		if (!isValidGoogleFontsUrl(importUrl)) {
-			toast.error("Please enter a valid Google Fonts URL");
+			toast.error(t("customFont.errorInvalidUrl"));
 			return;
 		}
 
 		if (!fontName.trim()) {
-			toast.error("Please enter a font name");
+			toast.error(t("customFont.errorEmptyName"));
 			return;
 		}
 
@@ -65,7 +68,7 @@ export function AddCustomFontDialog({ onFontAdded }: AddCustomFontDialogProps) {
 			// Extract font family from URL
 			const fontFamily = parseFontFamilyFromImport(importUrl);
 			if (!fontFamily) {
-				toast.error("Could not extract font family from URL");
+				toast.error(t("customFont.errorExtractFailed"));
 				setLoading(false);
 				return;
 			}
@@ -86,7 +89,7 @@ export function AddCustomFontDialog({ onFontAdded }: AddCustomFontDialogProps) {
 				onFontAdded(newFont);
 			}
 
-			toast.success(`Font "${fontName}" added successfully`);
+			toast.success(t("customFont.successMessage", { fontName }));
 
 			// Reset and close
 			setImportUrl("");
@@ -95,10 +98,10 @@ export function AddCustomFontDialog({ onFontAdded }: AddCustomFontDialogProps) {
 		} catch (error) {
 			console.error("Failed to add custom font:", error);
 			const errorMessage = error instanceof Error ? error.message : "Failed to load font";
-			toast.error("Failed to add font", {
+			toast.error(t("customFont.failedToAdd"), {
 				description: errorMessage.includes("timeout")
-					? "Font took too long to load. Please check the URL and try again."
-					: "The font could not be loaded. Please verify the Google Fonts URL is correct.",
+					? t("customFont.errorTimeout")
+					: t("customFont.errorLoadFailed"),
 			});
 		} finally {
 			setLoading(false);
@@ -114,12 +117,12 @@ export function AddCustomFontDialog({ onFontAdded }: AddCustomFontDialogProps) {
 					className="w-full bg-white/5 border-white/10 text-slate-200 hover:bg-white/10 h-9 text-xs"
 				>
 					<Plus className="w-3 h-3 mr-1" />
-					Add Google Font
+					{t("customFont.dialogTitle")}
 				</Button>
 			</DialogTrigger>
 			<DialogContent className="bg-[#1a1a1c] border-white/10 text-slate-200">
 				<DialogHeader>
-					<DialogTitle>Add Google Font</DialogTitle>
+					<DialogTitle>{t("customFont.dialogTitle")}</DialogTitle>
 					<DialogDescription className="text-slate-400">
 						Add a custom font from Google Fonts to use in your annotations.
 					</DialogDescription>
@@ -128,34 +131,30 @@ export function AddCustomFontDialog({ onFontAdded }: AddCustomFontDialogProps) {
 				<div className="space-y-4 mt-4">
 					<div className="space-y-2">
 						<Label htmlFor="import-url" className="text-slate-200">
-							Google Fonts Import URL
+							{t("customFont.urlLabel")}
 						</Label>
 						<Input
 							id="import-url"
-							placeholder="https://fonts.googleapis.com/css2?family=Roboto&display=swap"
+							placeholder={t("customFont.urlPlaceholder")}
 							value={importUrl}
 							onChange={(e) => handleImportUrlChange(e.target.value)}
 							className="bg-white/5 border-white/10 text-slate-200"
 						/>
-						<p className="text-xs text-slate-400">
-							Get this from Google Fonts: Select a font → Click "Get font" → Copy the @import URL
-						</p>
+						<p className="text-xs text-slate-400">{t("customFont.urlHelp")}</p>
 					</div>
 
 					<div className="space-y-2">
 						<Label htmlFor="font-name" className="text-slate-200">
-							Display Name
+							{t("customFont.nameLabel")}
 						</Label>
 						<Input
 							id="font-name"
-							placeholder="My Custom Font"
+							placeholder={t("customFont.namePlaceholder")}
 							value={fontName}
 							onChange={(e) => setFontName(e.target.value)}
 							className="bg-white/5 border-white/10 text-slate-200"
 						/>
-						<p className="text-xs text-slate-400">
-							This is how the font will appear in the font selector
-						</p>
+						<p className="text-xs text-slate-400">{t("customFont.nameHelp")}</p>
 					</div>
 
 					<div className="flex justify-end gap-2 mt-6">
@@ -164,14 +163,14 @@ export function AddCustomFontDialog({ onFontAdded }: AddCustomFontDialogProps) {
 							onClick={() => setOpen(false)}
 							className="bg-white/5 border-white/10 text-slate-200 hover:bg-white/10"
 						>
-							Cancel
+							{tc("actions.cancel")}
 						</Button>
 						<Button
 							onClick={handleAdd}
 							disabled={loading}
 							className="bg-blue-600 hover:bg-blue-700 text-white"
 						>
-							{loading ? "Adding..." : "Add Font"}
+							{loading ? t("customFont.addingButton") : t("customFont.addButton")}
 						</Button>
 					</div>
 				</div>

src/components/video-editor/AnnotationSettingsPanel.tsx

@@ -27,6 +27,7 @@ import {
 import { Slider } from "@/components/ui/slider";
 import { Tabs, TabsContent, TabsList, TabsTrigger } from "@/components/ui/tabs";
 import { ToggleGroup, ToggleGroupItem } from "@/components/ui/toggle-group";
+import { useScopedT } from "@/contexts/I18nContext";
 import { type CustomFont, getCustomFonts } from "@/lib/customFonts";
 import { cn } from "@/lib/utils";
 import { AddCustomFontDialog } from "./AddCustomFontDialog";
@@ -43,14 +44,14 @@ interface AnnotationSettingsPanelProps {
 }
 
 const FONT_FAMILIES = [
-	{ value: "system-ui, -apple-system, sans-serif", label: "Classic" },
-	{ value: "Georgia, serif", label: "Editor" },
-	{ value: "Impact, Arial Black, sans-serif", label: "Strong" },
-	{ value: "Courier New, monospace", label: "Typewriter" },
-	{ value: "Brush Script MT, cursive", label: "Deco" },
-	{ value: "Arial, sans-serif", label: "Simple" },
-	{ value: "Verdana, sans-serif", label: "Modern" },
-	{ value: "Trebuchet MS, sans-serif", label: "Clean" },
+	{ value: "system-ui, -apple-system, sans-serif", labelKey: "classic" },
+	{ value: "Georgia, serif", labelKey: "editor" },
+	{ value: "Impact, Arial Black, sans-serif", labelKey: "strong" },
+	{ value: "Courier New, monospace", labelKey: "typewriter" },
+	{ value: "Brush Script MT, cursive", labelKey: "deco" },
+	{ value: "Arial, sans-serif", labelKey: "simple" },
+	{ value: "Verdana, sans-serif", labelKey: "modern" },
+	{ value: "Trebuchet MS, sans-serif", labelKey: "clean" },
 ];
 
 const FONT_SIZES = [12, 14, 16, 18, 20, 24, 28, 32, 36, 40, 48, 56, 64, 72, 80, 96, 128];
@@ -63,9 +64,21 @@ export function AnnotationSettingsPanel({
 	onFigureDataChange,
 	onDelete,
 }: AnnotationSettingsPanelProps) {
+	const t = useScopedT("settings");
 	const fileInputRef = useRef<HTMLInputElement>(null);
 	const [customFonts, setCustomFonts] = useState<CustomFont[]>([]);
 
+	const fontStyleLabels: Record<string, string> = {
+		classic: t("fontStyles.classic"),
+		editor: t("fontStyles.editor"),
+		strong: t("fontStyles.strong"),
+		typewriter: t("fontStyles.typewriter"),
+		deco: t("fontStyles.deco"),
+		simple: t("fontStyles.simple"),
+		modern: t("fontStyles.modern"),
+		clean: t("fontStyles.clean"),
+	};
+
 	// Load custom fonts on mount
 	useEffect(() => {
 		setCustomFonts(getCustomFonts());
@@ -99,8 +112,8 @@ export function AnnotationSettingsPanel({
 		// Validate file type
 		const validTypes = ["image/jpeg", "image/jpg", "image/png", "image/gif", "image/webp"];
 		if (!validTypes.includes(file.type)) {
-			toast.error("Invalid file type", {
-				description: "Please upload a JPG, PNG, GIF, or WebP image file.",
+			toast.error(t("annotation.invalidImageType"), {
+				description: t("annotation.imageFormatsOnly"),
 			});
 			event.target.value = "";
 			return;
@@ -112,12 +125,12 @@ export function AnnotationSettingsPanel({
 			const dataUrl = e.target?.result as string;
 			if (dataUrl) {
 				onContentChange(dataUrl);
-				toast.success("Image uploaded successfully!");
+				toast.success(t("annotation.imageUploadSuccess"));
 			}
 		};
 
 		reader.onerror = () => {
-			toast.error("Failed to upload image", {
+			toast.error(t("annotation.failedImageUpload"), {
 				description: "There was an error reading the file.",
 			});
 		};
@@ -130,9 +143,9 @@ export function AnnotationSettingsPanel({
 		<div className="flex-[2] min-w-0 bg-[#09090b] border border-white/5 rounded-2xl p-4 flex flex-col shadow-xl h-full overflow-y-auto custom-scrollbar">
 			<div className="mb-6">
 				<div className="flex items-center justify-between mb-4">
-					<span className="text-sm font-medium text-slate-200">Annotation Settings</span>
+					<span className="text-sm font-medium text-slate-200">{t("annotation.title")}</span>
 					<span className="text-[10px] uppercase tracking-wider font-medium text-[#34B27B] bg-[#34B27B]/10 px-2 py-1 rounded-full">
-						Active
+						{t("annotation.active")}
 					</span>
 				</div>
 
@@ -148,14 +161,14 @@ export function AnnotationSettingsPanel({
 							className="data-[state=active]:bg-[#34B27B] data-[state=active]:text-white text-slate-400 py-2 rounded-lg transition-all gap-2"
 						>
 							<Type className="w-4 h-4" />
-							Text
+							{t("annotation.typeText")}
 						</TabsTrigger>
 						<TabsTrigger
 							value="image"
 							className="data-[state=active]:bg-[#34B27B] data-[state=active]:text-white text-slate-400 py-2 rounded-lg transition-all gap-2"
 						>
 							<ImageIcon className="w-4 h-4" />
-							Image
+							{t("annotation.typeImage")}
 						</TabsTrigger>
 						<TabsTrigger
 							value="figure"
@@ -170,18 +183,20 @@ export function AnnotationSettingsPanel({
 							>
 								<path d="M4 12h16m0 0l-6-6m6 6l-6 6" strokeLinecap="round" strokeLinejoin="round" />
 							</svg>
-							Arrow
+							{t("annotation.typeArrow")}
 						</TabsTrigger>
 					</TabsList>
 
 					{/* Text Content */}
 					<TabsContent value="text" className="mt-0 space-y-4">
 						<div>
-							<label className="text-xs font-medium text-slate-200 mb-2 block">Text Content</label>
+							<label className="text-xs font-medium text-slate-200 mb-2 block">
+								{t("annotation.textContent")}
+							</label>
 							<textarea
 								value={annotation.textContent || annotation.content}
 								onChange={(e) => onContentChange(e.target.value)}
-								placeholder="Enter your text..."
+								placeholder={t("annotation.textPlaceholder")}
 								rows={5}
 								className="w-full px-3 py-2 bg-white/5 border border-white/10 rounded-lg text-slate-200 text-sm placeholder:text-slate-500 focus:outline-none focus:ring-2 focus:ring-[#34B27B] focus:border-transparent resize-none"
 							/>
@@ -193,14 +208,14 @@ export function AnnotationSettingsPanel({
 							<div className="grid grid-cols-2 gap-2">
 								<div>
 									<label className="text-xs font-medium text-slate-200 mb-2 block">
-										Font Style
+										{t("annotation.fontStyle")}
 									</label>
 									<Select
 										value={annotation.style.fontFamily}
 										onValueChange={(value) => onStyleChange({ fontFamily: value })}
 									>
 										<SelectTrigger className="w-full bg-white/5 border-white/10 text-slate-200 h-9 text-xs">
-											<SelectValue placeholder="Select style" />
+											<SelectValue placeholder={t("annotation.selectStyle")} />
 										</SelectTrigger>
 										<SelectContent className="bg-[#1a1a1c] border-white/10 text-slate-200 max-h-[300px]">
 											{FONT_FAMILIES.map((font) => (
@@ -209,13 +224,13 @@ export function AnnotationSettingsPanel({
 													value={font.value}
 													style={{ fontFamily: font.value }}
 												>
-													{font.label}
+													{fontStyleLabels[font.labelKey]}
 												</SelectItem>
 											))}
 											{customFonts.length > 0 && (
 												<>
 													<div className="px-2 py-1.5 text-[10px] font-medium text-slate-400 uppercase tracking-wider">
-														Custom Fonts
+														{t("annotation.customFonts")}
 													</div>
 													{customFonts.map((font) => (
 														<SelectItem
@@ -232,13 +247,15 @@ export function AnnotationSettingsPanel({
 									</Select>
 								</div>
 								<div>
-									<label className="text-xs font-medium text-slate-200 mb-2 block">Size</label>
+									<label className="text-xs font-medium text-slate-200 mb-2 block">
+										{t("annotation.size")}
+									</label>
 									<Select
 										value={annotation.style.fontSize.toString()}
 										onValueChange={(value) => onStyleChange({ fontSize: parseInt(value) })}
 									>
 										<SelectTrigger className="w-full bg-white/5 border-white/10 text-slate-200 h-9 text-xs">
-											<SelectValue placeholder="Size" />
+											<SelectValue placeholder={t("annotation.size")} />
 										</SelectTrigger>
 										<SelectContent className="bg-[#1a1a1c] border-white/10 text-slate-200 max-h-[200px]">
 											{FONT_SIZES.map((size) => (
@@ -345,7 +362,7 @@ export function AnnotationSettingsPanel({
 							<div className="grid grid-cols-2 gap-4">
 								<div>
 									<label className="text-xs font-medium text-slate-200 mb-2 block">
-										Text Color
+										{t("annotation.textColor")}
 									</label>
 									<Popover>
 										<PopoverTrigger asChild>
@@ -379,7 +396,7 @@ export function AnnotationSettingsPanel({
 								</div>
 								<div>
 									<label className="text-xs font-medium text-slate-200 mb-2 block">
-										Background
+										{t("annotation.background")}
 									</label>
 									<Popover>
 										<PopoverTrigger asChild>
@@ -395,7 +412,9 @@ export function AnnotationSettingsPanel({
 													/>
 												</div>
 												<span className="text-xs text-slate-300 truncate flex-1 text-left">
-													{annotation.style.backgroundColor === "transparent" ? "None" : "Color"}
+													{annotation.style.backgroundColor === "transparent"
+														? t("annotation.none")
+														: t("annotation.color")}
 												</span>
 												<ChevronDown className="h-3 w-3 opacity-50" />
 											</Button>
@@ -423,7 +442,7 @@ export function AnnotationSettingsPanel({
 													onStyleChange({ backgroundColor: "transparent" });
 												}}
 											>
-												Clear Background
+												{t("annotation.clearBackground")}
 											</Button>
 										</PopoverContent>
 									</Popover>
@@ -447,7 +466,7 @@ export function AnnotationSettingsPanel({
 							className="w-full gap-2 bg-white/5 text-slate-200 border-white/10 hover:bg-[#34B27B] hover:text-white hover:border-[#34B27B] transition-all py-8"
 						>
 							<Upload className="w-5 h-5" />
-							Upload Image
+							{t("annotation.uploadImage")}
 						</Button>
 
 						{annotation.content && annotation.content.startsWith("data:image") && (
@@ -461,14 +480,14 @@ export function AnnotationSettingsPanel({
 						)}
 
 						<p className="text-xs text-slate-500 text-center leading-relaxed">
-							Supported formats: JPG, PNG, GIF, WebP
+							{t("annotation.supportedFormats")}
 						</p>
 					</TabsContent>
 
 					<TabsContent value="figure" className="mt-0 space-y-4">
 						<div>
 							<label className="text-xs font-medium text-slate-200 mb-3 block">
-								Arrow Direction
+								{t("annotation.arrowDirection")}
 							</label>
 							<div className="grid grid-cols-4 gap-2">
 								{(
@@ -517,7 +536,9 @@ export function AnnotationSettingsPanel({
 
 						<div>
 							<label className="text-xs font-medium text-slate-200 mb-2 block">
-								Stroke Width: {annotation.figureData?.strokeWidth || 4}px
+								{t("annotation.strokeWidth", {
+									width: String(annotation.figureData?.strokeWidth || 4),
+								})}
 							</label>
 							<Slider
 								value={[annotation.figureData?.strokeWidth || 4]}
@@ -536,7 +557,9 @@ export function AnnotationSettingsPanel({
 						</div>
 
 						<div>
-							<label className="text-xs font-medium text-slate-200 mb-2 block">Arrow Color</label>
+							<label className="text-xs font-medium text-slate-200 mb-2 block">
+								{t("annotation.arrowColor")}
+							</label>
 							<Popover>
 								<PopoverTrigger asChild>
 									<Button
@@ -581,28 +604,18 @@ export function AnnotationSettingsPanel({
 					className="w-full gap-2 bg-red-500/10 text-red-400 border border-red-500/20 hover:bg-red-500/20 hover:border-red-500/30 transition-all mt-4"
 				>
 					<Trash2 className="w-4 h-4" />
-					Delete Annotation
+					{t("annotation.deleteAnnotation")}
 				</Button>
 
 				<div className="mt-6 p-3 bg-white/5 rounded-lg border border-white/5">
 					<div className="flex items-center gap-2 mb-2 text-slate-300">
 						<Info className="w-3.5 h-3.5" />
-						<span className="text-xs font-medium">Shortcuts & Tips</span>
+						<span className="text-xs font-medium">{t("annotation.shortcutsAndTips")}</span>
 					</div>
 					<ul className="text-[10px] text-slate-400 space-y-1.5 list-disc pl-3 leading-relaxed">
-						<li>Move playhead to overlapping annotation section and select an item.</li>
-						<li>
-							Use{" "}
-							<kbd className="px-1 py-0.5 bg-white/10 rounded text-slate-300 font-mono">Tab</kbd> to
-							cycle through overlapping items.
-						</li>
-						<li>
-							Use{" "}
-							<kbd className="px-1 py-0.5 bg-white/10 rounded text-slate-300 font-mono">
-								Shift+Tab
-							</kbd>{" "}
-							to cycle backwards.
-						</li>
+						<li>{t("annotation.tipMovePlayhead")}</li>
+						<li>{t("annotation.tipTabCycle")}</li>
+						<li>{t("annotation.tipShiftTabCycle")}</li>
 					</ul>
 				</div>
 			</div>

src/components/video-editor/ExportDialog.tsx

@@ -1,6 +1,7 @@
 import { Download, Loader2, X } from "lucide-react";
 import { useEffect, useState } from "react";
 import { Button } from "@/components/ui/button";
+import { useScopedT } from "@/contexts/I18nContext";
 import type { ExportProgress } from "@/lib/exporter";
 
 interface ExportDialogProps {
@@ -26,6 +27,7 @@ export function ExportDialog({
 	exportedFilePath,
 	onShowInFolder,
 }: ExportDialogProps) {
+	const t = useScopedT("dialogs");
 	const [showSuccess, setShowSuccess] = useState(false);
 
 	// Reset showSuccess when a new export starts or dialog reopens
@@ -65,25 +67,25 @@ export function ExportDialog({
 
 	// Get status message based on phase
 	const getStatusMessage = () => {
-		if (error) return "Please try again";
+		if (error) return t("export.tryAgain");
 		if (isCompiling || isFinalizing) {
 			if (exportFormat === "mp4") {
-				return "Finalizing video export...";
+				return t("export.finalizingVideo");
 			}
 			if (renderProgress !== undefined && renderProgress > 0) {
-				return `Compiling GIF... ${renderProgress}%`;
+				return t("export.compilingGifProgress", { progress: String(renderProgress) });
 			}
-			return "Compiling GIF... This may take a while";
+			return t("export.compilingGifWait");
 		}
-		return "This may take a moment...";
+		return t("export.takeMoment");
 	};
 
 	// Get title based on phase
 	const getTitle = () => {
-		if (error) return "Export Failed";
-		if (isFinalizing && exportFormat === "mp4") return "Finalizing Video";
-		if (isCompiling || isFinalizing) return "Compiling GIF";
-		return `Exporting ${formatLabel}`;
+		if (error) return t("export.failed");
+		if (isFinalizing && exportFormat === "mp4") return t("export.finalizingVideoTitle");
+		if (isCompiling || isFinalizing) return t("export.compilingGif");
+		return t("export.exportingFormat", { format: formatLabel });
 	};
 
 	return (
@@ -101,9 +103,11 @@ export function ExportDialog({
 									<Download className="w-6 h-6 text-[#34B27B]" />
 								</div>
 								<div className="flex flex-col gap-2">
-									<span className="text-xl font-bold text-slate-200 block">Export Complete</span>
+									<span className="text-xl font-bold text-slate-200 block">
+										{t("export.complete")}
+									</span>
 									<span className="text-sm text-slate-400">
-										Your {formatLabel.toLowerCase()} is ready
+										{t("export.yourFormatReady", { format: formatLabel.toLowerCase() })}
 									</span>
 									{exportedFilePath && (
 										<Button
@@ -111,7 +115,7 @@ export function ExportDialog({
 											onClick={onShowInFolder}
 											className="mt-2 w-fit px-3 py-1 text-sm rounded-md bg-white/10 hover:bg-white/20 text-slate-200"
 										>
-											Show in Folder
+											{t("export.showInFolder")}
 										</Button>
 									)}
 									{exportedFilePath && (
@@ -166,7 +170,11 @@ export function ExportDialog({
 					<div className="space-y-6">
 						<div className="space-y-2">
 							<div className="flex justify-between text-xs font-medium text-slate-400 uppercase tracking-wider">
-								<span>{isCompiling || isFinalizing ? "Compiling" : "Rendering Frames"}</span>
+								<span>
+									{isCompiling || isFinalizing
+										? t("export.compiling")
+										: t("export.renderingFrames")}
+								</span>
 								<span className="font-mono text-slate-200">
 									{isCompiling || isFinalizing ? (
 										renderProgress !== undefined && renderProgress > 0 ? (
@@ -174,7 +182,7 @@ export function ExportDialog({
 										) : (
 											<span className="flex items-center gap-2">
 												<Loader2 className="w-3 h-3 animate-spin" />
-												Processing...
+												{t("export.processing")}
 											</span>
 										)
 									) : (
@@ -218,19 +226,19 @@ export function ExportDialog({
 						<div className="grid grid-cols-2 gap-4">
 							<div className="bg-white/5 rounded-xl p-3 border border-white/5">
 								<div className="text-[10px] text-slate-500 uppercase tracking-wider mb-1">
-									{isCompiling || isFinalizing ? "Status" : "Format"}
+									{isCompiling || isFinalizing ? t("export.status") : t("export.format")}
 								</div>
 								<div className="text-slate-200 font-medium text-sm">
 									{isFinalizing && exportFormat === "mp4"
-										? "Finalizing..."
+										? t("export.finalizing")
 										: isCompiling || isFinalizing
-											? "Compiling..."
+											? t("export.compilingStatus")
 											: formatLabel}
 								</div>
 							</div>
 							<div className="bg-white/5 rounded-xl p-3 border border-white/5">
 								<div className="text-[10px] text-slate-500 uppercase tracking-wider mb-1">
-									Frames
+									{t("export.frames")}
 								</div>
 								<div className="text-slate-200 font-medium text-sm">
 									{progress.currentFrame} / {progress.totalFrames}
@@ -245,7 +253,7 @@ export function ExportDialog({
 									variant="destructive"
 									className="w-full py-6 bg-red-500/10 text-red-400 border border-red-500/20 hover:bg-red-500/20 hover:border-red-500/30 transition-all rounded-xl"
 								>
-									Cancel Export
+									{t("export.cancelExport")}
 								</Button>
 							</div>
 						)}
@@ -254,7 +262,9 @@ export function ExportDialog({
 
 				{showSuccess && (
 					<div className="text-center py-4 animate-in zoom-in-95">
-						<p className="text-lg text-slate-200 font-medium">{formatLabel} saved successfully!</p>
+						<p className="text-lg text-slate-200 font-medium">
+							{t("export.savedSuccessfully", { format: formatLabel })}
+						</p>
 					</div>
 				)}
 			</div>

src/components/video-editor/FormatSelector.tsx

@@ -1,4 +1,5 @@
 import { Film, Image } from "lucide-react";
+import { useScopedT } from "@/contexts/I18nContext";
 import type { ExportFormat } from "@/lib/exporter/types";
 import { cn } from "@/lib/utils";
 
@@ -8,26 +9,9 @@ interface FormatSelectorProps {
 	disabled?: boolean;
 }
 
-interface FormatOption {
-	value: ExportFormat;
-	label: string;
-	description: string;
-	icon: React.ReactNode;
-}
-
-const formatOptions: FormatOption[] = [
-	{
-		value: "mp4",
-		label: "MP4 Video",
-		description: "High quality video file",
-		icon: <Film className="w-5 h-5" />,
-	},
-	{
-		value: "gif",
-		label: "GIF Animation",
-		description: "Animated image for sharing",
-		icon: <Image className="w-5 h-5" />,
-	},
+const formatOptions: Array<{ value: ExportFormat; icon: React.ReactNode }> = [
+	{ value: "mp4", icon: <Film className="w-5 h-5" /> },
+	{ value: "gif", icon: <Image className="w-5 h-5" /> },
 ];
 
 export function FormatSelector({
@@ -35,10 +19,18 @@ export function FormatSelector({
 	onFormatChange,
 	disabled = false,
 }: FormatSelectorProps) {
+	const t = useScopedT("settings");
+
+	const formatLabels: Record<ExportFormat, { label: string; description: string }> = {
+		mp4: { label: t("exportFormat.mp4Video"), description: t("exportFormat.mp4Description") },
+		gif: { label: t("exportFormat.gifAnimation"), description: t("exportFormat.gifDescription") },
+	};
+
 	return (
 		<div className="grid grid-cols-2 gap-3">
 			{formatOptions.map((option) => {
 				const isSelected = selectedFormat === option.value;
+				const labels = formatLabels[option.value];
 				return (
 					<button
 						key={option.value}
@@ -63,8 +55,8 @@ export function FormatSelector({
 							{option.icon}
 						</div>
 						<div className="text-center">
-							<div className="font-medium text-sm">{option.label}</div>
-							<div className="text-xs text-slate-500 mt-0.5">{option.description}</div>
+							<div className="font-medium text-sm">{labels.label}</div>
+							<div className="text-xs text-slate-500 mt-0.5">{labels.description}</div>
 						</div>
 						{isSelected && (
 							<div className="absolute top-2 right-2 w-2 h-2 rounded-full bg-[#34B27B]" />

src/components/video-editor/KeyboardShortcutsHelp.tsx

@@ -1,9 +1,11 @@
 import { HelpCircle, Settings2 } from "lucide-react";
+import { useScopedT } from "@/contexts/I18nContext";
 import { useShortcuts } from "@/contexts/ShortcutsContext";
-import { FIXED_SHORTCUTS, formatBinding, SHORTCUT_ACTIONS, SHORTCUT_LABELS } from "@/lib/shortcuts";
+import { FIXED_SHORTCUTS, formatBinding, SHORTCUT_ACTIONS } from "@/lib/shortcuts";
 
 export function KeyboardShortcutsHelp() {
 	const { shortcuts, isMac, openConfig } = useShortcuts();
+	const t = useScopedT("shortcuts");
 
 	return (
 		<div className="relative group">
@@ -11,7 +13,7 @@ export function KeyboardShortcutsHelp() {
 
 			<div className="absolute right-0 top-full mt-2 w-64 bg-[#09090b] border border-white/10 rounded-lg p-3 opacity-0 invisible group-hover:opacity-100 group-hover:visible transition-all duration-200 shadow-xl z-50">
 				<div className="flex items-center justify-between mb-2">
-					<span className="text-xs font-semibold text-slate-200">Keyboard Shortcuts</span>
+					<span className="text-xs font-semibold text-slate-200">{t("title")}</span>
 					<button
 						type="button"
 						onClick={openConfig}
@@ -19,14 +21,14 @@ export function KeyboardShortcutsHelp() {
 						className="flex items-center gap-1 text-[10px] text-slate-500 hover:text-[#34B27B] transition-colors"
 					>
 						<Settings2 className="w-3 h-3" />
-						Customize
+						{t("customize")}
 					</button>
 				</div>
 
 				<div className="space-y-1.5 text-[10px]">
 					{SHORTCUT_ACTIONS.map((action) => (
 						<div key={action} className="flex items-center justify-between">
-							<span className="text-slate-400">{SHORTCUT_LABELS[action]}</span>
+							<span className="text-slate-400">{t(`actions.${action}`)}</span>
 							<kbd className="px-1 py-0.5 bg-white/5 border border-white/10 rounded text-[#34B27B] font-mono">
 								{formatBinding(shortcuts[action], isMac)}
 							</kbd>
@@ -35,8 +37,10 @@ export function KeyboardShortcutsHelp() {
 
 					<div className="pt-1 border-t border-white/5 mt-1 space-y-1.5">
 						{FIXED_SHORTCUTS.map((fixed) => (
-							<div key={fixed.label} className="flex items-center justify-between">
-								<span className="text-slate-400">{fixed.label}</span>
+							<div key={fixed.i18nKey} className="flex items-center justify-between">
+								<span className="text-slate-400">
+									{t(`fixedActions.${fixed.i18nKey}`, { defaultValue: fixed.label })}
+								</span>
 								<kbd className="px-1 py-0.5 bg-white/5 border border-white/10 rounded text-[#34B27B] font-mono">
 									{isMac
 										? fixed.display

src/components/video-editor/PlaybackControls.tsx

@@ -1,4 +1,5 @@
-import { Pause, Play } from "lucide-react";
+import { Maximize, Minimize, Pause, Play } from "lucide-react";
+import { useScopedT } from "@/contexts/I18nContext";
 import { cn } from "@/lib/utils";
 import { Button } from "../ui/button";
 
@@ -6,6 +7,8 @@ interface PlaybackControlsProps {
 	isPlaying: boolean;
 	currentTime: number;
 	duration: number;
+	isFullscreen?: boolean;
+	onToggleFullscreen?: () => void;
 	onTogglePlayPause: () => void;
 	onSeek: (time: number) => void;
 }
@@ -14,9 +17,13 @@ export default function PlaybackControls({
 	isPlaying,
 	currentTime,
 	duration,
+	isFullscreen = false,
+	onToggleFullscreen,
 	onTogglePlayPause,
 	onSeek,
 }: PlaybackControlsProps) {
+	const t = useScopedT("common");
+
 	function formatTime(seconds: number) {
 		if (!isFinite(seconds) || isNaN(seconds) || seconds < 0) return "0:00";
 		const mins = Math.floor(seconds / 60);
@@ -41,7 +48,7 @@ export default function PlaybackControls({
 						? "bg-white/10 text-white hover:bg-white/20"
 						: "bg-white text-black hover:bg-white/90 hover:scale-105 shadow-[0_0_15px_rgba(255,255,255,0.3)]",
 				)}
-				aria-label={isPlaying ? "Pause" : "Play"}
+				aria-label={isPlaying ? t("playback.pause") : t("playback.play")}
 			>
 				{isPlaying ? (
 					<Pause className="w-3.5 h-3.5 fill-current" />
@@ -84,6 +91,21 @@ export default function PlaybackControls({
 			<span className="text-[9px] font-medium text-slate-500 tabular-nums w-[30px]">
 				{formatTime(duration)}
 			</span>
+
+			{onToggleFullscreen && (
+				<Button
+					onClick={onToggleFullscreen}
+					size="icon"
+					className="w-7 h-7 rounded-full transition-all duration-200 border border-transparent hover:bg-white/10 text-white hover:border-white/10 shrink-0 shadow-none ml-0.5"
+					aria-label={isFullscreen ? t("playback.exitFullscreen") : t("playback.fullscreen")}
+				>
+					{isFullscreen ? (
+						<Minimize className="w-3.5 h-3.5" />
+					) : (
+						<Maximize className="w-3.5 h-3.5" />
+					)}
+				</Button>
+			)}
 		</div>
 	);
 }

src/components/video-editor/SettingsPanel.tsx

@@ -4,11 +4,9 @@ import {
 	Crop,
 	Download,
 	Film,
-	FolderOpen,
 	Image,
 	Lock,
 	Palette,
-	Save,
 	Sparkles,
 	Star,
 	Trash2,
@@ -25,14 +23,23 @@ import {
 	AccordionTrigger,
 } from "@/components/ui/accordion";
 import { Button } from "@/components/ui/button";
+import {
+	Select,
+	SelectContent,
+	SelectItem,
+	SelectTrigger,
+	SelectValue,
+} from "@/components/ui/select";
 import { Slider } from "@/components/ui/slider";
 import { Switch } from "@/components/ui/switch";
 import { Tabs, TabsContent, TabsList, TabsTrigger } from "@/components/ui/tabs";
+import { useScopedT } from "@/contexts/I18nContext";
 import { getAssetPath } from "@/lib/assetPath";
+import { WEBCAM_LAYOUT_PRESETS } from "@/lib/compositeLayout";
 import type { ExportFormat, ExportQuality, GifFrameRate, GifSizePreset } from "@/lib/exporter";
 import { GIF_FRAME_RATES, GIF_SIZE_PRESETS } from "@/lib/exporter";
 import { cn } from "@/lib/utils";
-import { type AspectRatio } from "@/utils/aspectRatioUtils";
+import { type AspectRatio, isPortraitAspectRatio } from "@/utils/aspectRatioUtils";
 import { getTestId } from "@/utils/getTestId";
 import { AnnotationSettingsPanel } from "./AnnotationSettingsPanel";
 import { CropControl } from "./CropControl";
@@ -43,7 +50,10 @@ import type {
 	CropRegion,
 	FigureData,
 	PlaybackSpeed,
+	WebcamLayoutPreset,
+	WebcamMaskShape,
 	ZoomDepth,
+	ZoomFocusMode,
 } from "./types";
 import { SPEED_OPTIONS } from "./types";
 
@@ -84,6 +94,9 @@ interface SettingsPanelProps {
 	onWallpaperChange: (path: string) => void;
 	selectedZoomDepth?: ZoomDepth | null;
 	onZoomDepthChange?: (depth: ZoomDepth) => void;
+	selectedZoomFocusMode?: ZoomFocusMode | null;
+	onZoomFocusModeChange?: (mode: ZoomFocusMode) => void;
+	hasCursorTelemetry?: boolean;
 	selectedZoomId?: string | null;
 	onZoomDelete?: (id: string) => void;
 	selectedTrimId?: string | null;
@@ -118,9 +131,9 @@ interface SettingsPanelProps {
 	gifSizePreset?: GifSizePreset;
 	onGifSizePresetChange?: (preset: GifSizePreset) => void;
 	gifOutputDimensions?: { width: number; height: number };
-	onSaveProject?: () => void;
-	onLoadProject?: () => void;
 	onExport?: () => void;
+	unsavedExport?: { arrayBuffer: ArrayBuffer; fileName: string; format: string } | null;
+	onSaveUnsavedExport?: () => void;
 	selectedAnnotationId?: string | null;
 	annotationRegions?: AnnotationRegion[];
 	onAnnotationContentChange?: (id: string, content: string) => void;
@@ -132,6 +145,11 @@ interface SettingsPanelProps {
 	selectedSpeedValue?: PlaybackSpeed | null;
 	onSpeedChange?: (speed: PlaybackSpeed) => void;
 	onSpeedDelete?: (id: string) => void;
+	hasWebcam?: boolean;
+	webcamLayoutPreset?: WebcamLayoutPreset;
+	onWebcamLayoutPresetChange?: (preset: WebcamLayoutPreset) => void;
+	webcamMaskShape?: import("./types").WebcamMaskShape;
+	onWebcamMaskShapeChange?: (shape: import("./types").WebcamMaskShape) => void;
 }
 
 export default SettingsPanel;
@@ -150,6 +168,9 @@ export function SettingsPanel({
 	onWallpaperChange,
 	selectedZoomDepth,
 	onZoomDepthChange,
+	selectedZoomFocusMode,
+	onZoomFocusModeChange,
+	hasCursorTelemetry = false,
 	selectedZoomId,
 	onZoomDelete,
 	selectedTrimId,
@@ -183,9 +204,9 @@ export function SettingsPanel({
 	gifSizePreset = "medium",
 	onGifSizePresetChange,
 	gifOutputDimensions = { width: 1280, height: 720 },
-	onSaveProject,
-	onLoadProject,
 	onExport,
+	unsavedExport,
+	onSaveUnsavedExport,
 	selectedAnnotationId,
 	annotationRegions = [],
 	onAnnotationContentChange,
@@ -197,7 +218,13 @@ export function SettingsPanel({
 	selectedSpeedValue,
 	onSpeedChange,
 	onSpeedDelete,
+	hasWebcam = false,
+	webcamLayoutPreset = "picture-in-picture",
+	onWebcamLayoutPresetChange,
+	webcamMaskShape = "rectangle",
+	onWebcamMaskShapeChange,
 }: SettingsPanelProps) {
+	const t = useScopedT("settings");
 	const [wallpaperPaths, setWallpaperPaths] = useState<string[]>([]);
 	const [customImages, setCustomImages] = useState<string[]>([]);
 	const fileInputRef = useRef<HTMLInputElement>(null);
@@ -363,8 +390,8 @@ export function SettingsPanel({
 		// Validate file type - only allow JPG/JPEG
 		const validTypes = ["image/jpeg", "image/jpg"];
 		if (!validTypes.includes(file.type)) {
-			toast.error("Invalid file type", {
-				description: "Please upload a JPG or JPEG image file.",
+			toast.error(t("imageUpload.invalidFileType"), {
+				description: t("imageUpload.jpgOnly"),
 			});
 			event.target.value = "";
 			return;
@@ -377,13 +404,13 @@ export function SettingsPanel({
 			if (dataUrl) {
 				setCustomImages((prev) => [...prev, dataUrl]);
 				onWallpaperChange(dataUrl);
-				toast.success("Custom image uploaded successfully!");
+				toast.success(t("imageUpload.uploadSuccess"));
 			}
 		};
 
 		reader.onerror = () => {
-			toast.error("Failed to upload image", {
-				description: "There was an error reading the file.",
+			toast.error(t("imageUpload.failedToUpload"), {
+				description: t("imageUpload.errorReading"),
 			});
 		};
 
@@ -449,7 +476,7 @@ export function SettingsPanel({
 			<div className="flex-1 overflow-y-auto custom-scrollbar p-4 pb-0">
 				<div className="mb-4">
 					<div className="flex items-center justify-between mb-3">
-						<span className="text-sm font-medium text-slate-200">Zoom Level</span>
+						<span className="text-sm font-medium text-slate-200">{t("zoom.level")}</span>
 						<div className="flex items-center gap-2">
 							{zoomEnabled && selectedZoomDepth && (
 								<span className="text-[10px] uppercase tracking-wider font-medium text-[#34B27B] bg-[#34B27B]/10 px-2 py-0.5 rounded-full">
@@ -483,9 +510,42 @@ export function SettingsPanel({
 						})}
 					</div>
 					{!zoomEnabled && (
-						<p className="text-[10px] text-slate-500 mt-2 text-center">
-							Select a zoom region to adjust
-						</p>
+						<p className="text-[10px] text-slate-500 mt-2 text-center">{t("zoom.selectRegion")}</p>
+					)}
+					{zoomEnabled && hasCursorTelemetry && (
+						<div className="mt-3">
+							<span className="text-sm font-medium text-slate-200 mb-2 block">
+								{t("zoom.focusMode.title")}
+							</span>
+							<div className="grid grid-cols-2 gap-1.5">
+								{(["manual", "auto"] as const).map((mode) => {
+									const isActive = selectedZoomFocusMode === mode;
+									return (
+										<Button
+											key={mode}
+											type="button"
+											onClick={() => onZoomFocusModeChange?.(mode)}
+											className={cn(
+												"h-auto w-full rounded-lg border px-2 py-2 text-center shadow-sm transition-all",
+												"duration-200 ease-out cursor-pointer",
+												isActive
+													? "border-[#34B27B] bg-[#34B27B] text-white shadow-[#34B27B]/20"
+													: "border-white/5 bg-white/5 text-slate-400 hover:bg-white/10 hover:border-white/10 hover:text-slate-200",
+											)}
+										>
+											<span className="text-xs font-semibold capitalize">
+												{t(`zoom.focusMode.${mode}`)}
+											</span>
+										</Button>
+									);
+								})}
+							</div>
+							{selectedZoomFocusMode === "auto" && (
+								<p className="text-[10px] text-slate-500 mt-1.5">
+									{t("zoom.focusMode.autoDescription")}
+								</p>
+							)}
+						</div>
 					)}
 					{zoomEnabled && (
 						<Button
@@ -495,7 +555,7 @@ export function SettingsPanel({
 							className="mt-2 w-full gap-2 bg-red-500/10 text-red-400 border border-red-500/20 hover:bg-red-500/20 hover:border-red-500/30 transition-all h-8 text-xs"
 						>
 							<Trash2 className="w-3 h-3" />
-							Delete Zoom
+							{t("zoom.deleteZoom")}
 						</Button>
 					)}
 				</div>
@@ -509,14 +569,14 @@ export function SettingsPanel({
 							className="w-full gap-2 bg-red-500/10 text-red-400 border border-red-500/20 hover:bg-red-500/20 hover:border-red-500/30 transition-all h-8 text-xs"
 						>
 							<Trash2 className="w-3 h-3" />
-							Delete Trim Region
+							{t("trim.deleteRegion")}
 						</Button>
 					</div>
 				)}
 
 				<div className="mb-4">
 					<div className="flex items-center justify-between mb-3">
-						<span className="text-sm font-medium text-slate-200">Playback Speed</span>
+						<span className="text-sm font-medium text-slate-200">{t("speed.playbackSpeed")}</span>
 						{selectedSpeedId && selectedSpeedValue && (
 							<span className="text-[10px] uppercase tracking-wider font-medium text-[#d97706] bg-[#d97706]/10 px-2 py-0.5 rounded-full">
 								{SPEED_OPTIONS.find((o) => o.speed === selectedSpeedValue)?.label ??
@@ -550,9 +610,7 @@ export function SettingsPanel({
 						})}
 					</div>
 					{!selectedSpeedId && (
-						<p className="text-[10px] text-slate-500 mt-2 text-center">
-							Select a speed region to adjust
-						</p>
+						<p className="text-[10px] text-slate-500 mt-2 text-center">{t("speed.selectRegion")}</p>
 					)}
 					{selectedSpeedId && (
 						<Button
@@ -562,23 +620,154 @@ export function SettingsPanel({
 							className="mt-2 w-full gap-2 bg-red-500/10 text-red-400 border border-red-500/20 hover:bg-red-500/20 hover:border-red-500/30 transition-all h-8 text-xs"
 						>
 							<Trash2 className="w-3 h-3" />
-							Delete Speed Region
+							{t("speed.deleteRegion")}
 						</Button>
 					)}
 				</div>
 
-				<Accordion type="multiple" defaultValue={["effects", "background"]} className="space-y-1">
+				<Accordion
+					type="multiple"
+					defaultValue={hasWebcam ? ["layout", "effects", "background"] : ["effects", "background"]}
+					className="space-y-1"
+				>
+					{hasWebcam && (
+						<AccordionItem
+							value="layout"
+							className="border-white/5 rounded-xl bg-white/[0.02] px-3"
+						>
+							<AccordionTrigger className="py-2.5 hover:no-underline">
+								<div className="flex items-center gap-2">
+									<Sparkles className="w-4 h-4 text-[#34B27B]" />
+									<span className="text-xs font-medium">{t("layout.title")}</span>
+								</div>
+							</AccordionTrigger>
+							<AccordionContent className="pb-3">
+								<div className="p-2 rounded-lg bg-white/5 border border-white/5">
+									<div className="text-[10px] font-medium text-slate-300 mb-1.5">
+										{t("layout.preset")}
+									</div>
+									<Select
+										value={webcamLayoutPreset}
+										onValueChange={(value: WebcamLayoutPreset) =>
+											onWebcamLayoutPresetChange?.(value)
+										}
+									>
+										<SelectTrigger className="h-8 bg-black/20 border-white/10 text-xs">
+											<SelectValue placeholder={t("layout.selectPreset")} />
+										</SelectTrigger>
+										<SelectContent>
+											{WEBCAM_LAYOUT_PRESETS.filter(
+												(preset) =>
+													preset.value === "picture-in-picture" ||
+													isPortraitAspectRatio(aspectRatio),
+											).map((preset) => (
+												<SelectItem key={preset.value} value={preset.value} className="text-xs">
+													{preset.value === "picture-in-picture"
+														? t("layout.pictureInPicture")
+														: t("layout.verticalStack")}
+												</SelectItem>
+											))}
+										</SelectContent>
+									</Select>
+								</div>
+								{webcamLayoutPreset === "picture-in-picture" && (
+									<div className="mt-2 p-2 rounded-lg bg-white/5 border border-white/5">
+										<div className="text-[10px] font-medium text-slate-300 mb-1.5">
+											{t("layout.webcamShape")}
+										</div>
+										<div className="grid grid-cols-4 gap-1.5">
+											{(
+												[
+													{ value: "rectangle", label: "Rect" },
+													{ value: "circle", label: "Circle" },
+													{ value: "square", label: "Square" },
+													{ value: "rounded", label: "Rounded" },
+												] as Array<{ value: WebcamMaskShape; label: string }>
+											).map((shape) => (
+												<button
+													key={shape.value}
+													type="button"
+													onClick={() => onWebcamMaskShapeChange?.(shape.value)}
+													className={cn(
+														"h-10 rounded-lg border flex flex-col items-center justify-center gap-0.5 transition-all",
+														webcamMaskShape === shape.value
+															? "bg-[#34B27B] border-[#34B27B] text-white"
+															: "bg-white/5 border-white/10 hover:bg-white/10 hover:border-white/20 text-slate-400",
+													)}
+												>
+													<svg
+														width="16"
+														height="16"
+														viewBox="0 0 16 16"
+														fill="none"
+														xmlns="http://www.w3.org/2000/svg"
+													>
+														{shape.value === "rectangle" && (
+															<rect
+																x="1"
+																y="3"
+																width="14"
+																height="10"
+																rx="2"
+																stroke="currentColor"
+																strokeWidth="1.5"
+															/>
+														)}
+														{shape.value === "circle" && (
+															<circle
+																cx="8"
+																cy="8"
+																r="6.5"
+																stroke="currentColor"
+																strokeWidth="1.5"
+															/>
+														)}
+														{shape.value === "square" && (
+															<rect
+																x="2"
+																y="2"
+																width="12"
+																height="12"
+																rx="1"
+																stroke="currentColor"
+																strokeWidth="1.5"
+															/>
+														)}
+														{shape.value === "rounded" && (
+															<rect
+																x="1"
+																y="3"
+																width="14"
+																height="10"
+																rx="5"
+																stroke="currentColor"
+																strokeWidth="1.5"
+															/>
+														)}
+													</svg>
+													<span className="text-[8px] leading-none">{shape.label}</span>
+												</button>
+											))}
+										</div>
+									</div>
+								)}
+							</AccordionContent>
+						</AccordionItem>
+					)}
+
 					<AccordionItem value="effects" className="border-white/5 rounded-xl bg-white/[0.02] px-3">
 						<AccordionTrigger className="py-2.5 hover:no-underline">
 							<div className="flex items-center gap-2">
 								<Sparkles className="w-4 h-4 text-[#34B27B]" />
-								<span className="text-xs font-medium">Video Effects</span>
+								<span className="text-xs font-medium">{t("effects.title")}</span>
 							</div>
 						</AccordionTrigger>
 						<AccordionContent className="pb-3">
 							<div className="grid grid-cols-2 gap-2 mb-3">
 								<div className="flex items-center justify-between p-2 rounded-lg bg-white/5 border border-white/5">
-									<div className="text-[10px] font-medium text-slate-300">Blur BG</div>
+									<div className="text-[10px] font-medium text-slate-300">
+										{t("effects.blurBg")}
+									</div>
 									<Switch
 										checked={showBlur}
 										onCheckedChange={onBlurChange}
@@ -590,9 +779,11 @@ export function SettingsPanel({
 							<div className="grid grid-cols-2 gap-2">
 								<div className="p-2 rounded-lg bg-white/5 border border-white/5">
 									<div className="flex items-center justify-between mb-1">
-										<div className="text-[10px] font-medium text-slate-300">Motion Blur</div>
+										<div className="text-[10px] font-medium text-slate-300">
+											{t("effects.motionBlur")}
+										</div>
 										<span className="text-[10px] text-slate-500 font-mono">
-											{motionBlurAmount === 0 ? "off" : motionBlurAmount.toFixed(2)}
+											{motionBlurAmount === 0 ? t("effects.off") : motionBlurAmount.toFixed(2)}
 										</span>
 									</div>
 									<Slider
@@ -607,7 +798,9 @@ export function SettingsPanel({
 								</div>
 								<div className="p-2 rounded-lg bg-white/5 border border-white/5">
 									<div className="flex items-center justify-between mb-1">
-										<div className="text-[10px] font-medium text-slate-300">Shadow</div>
+										<div className="text-[10px] font-medium text-slate-300">
+											{t("effects.shadow")}
+										</div>
 										<span className="text-[10px] text-slate-500 font-mono">
 											{Math.round(shadowIntensity * 100)}%
 										</span>
@@ -624,7 +817,9 @@ export function SettingsPanel({
 								</div>
 								<div className="p-2 rounded-lg bg-white/5 border border-white/5">
 									<div className="flex items-center justify-between mb-1">
-										<div className="text-[10px] font-medium text-slate-300">Roundness</div>
+										<div className="text-[10px] font-medium text-slate-300">
+											{t("effects.roundness")}
+										</div>
 										<span className="text-[10px] text-slate-500 font-mono">{borderRadius}px</span>
 									</div>
 									<Slider
@@ -637,18 +832,25 @@ export function SettingsPanel({
 										className="w-full [&_[role=slider]]:bg-[#34B27B] [&_[role=slider]]:border-[#34B27B] [&_[role=slider]]:h-3 [&_[role=slider]]:w-3"
 									/>
 								</div>
-								<div className="p-2 rounded-lg bg-white/5 border border-white/5">
+								<div
+									className={`p-2 rounded-lg bg-white/5 border border-white/5 ${webcamLayoutPreset === "vertical-stack" ? "opacity-40 pointer-events-none" : ""}`}
+								>
 									<div className="flex items-center justify-between mb-1">
-										<div className="text-[10px] font-medium text-slate-300">Padding</div>
-										<span className="text-[10px] text-slate-500 font-mono">{padding}%</span>
+										<div className="text-[10px] font-medium text-slate-300">
+											{t("effects.padding")}
+										</div>
+										<span className="text-[10px] text-slate-500 font-mono">
+											{webcamLayoutPreset === "vertical-stack" ? "—" : `${padding}%`}
+										</span>
 									</div>
 									<Slider
-										value={[padding]}
+										value={[webcamLayoutPreset === "vertical-stack" ? 0 : padding]}
 										onValueChange={(values) => onPaddingChange?.(values[0])}
 										onValueCommit={() => onPaddingCommit?.()}
 										min={0}
 										max={100}
 										step={1}
+										disabled={webcamLayoutPreset === "vertical-stack"}
 										className="w-full [&_[role=slider]]:bg-[#34B27B] [&_[role=slider]]:border-[#34B27B] [&_[role=slider]]:h-3 [&_[role=slider]]:w-3"
 									/>
 								</div>
@@ -660,7 +862,7 @@ export function SettingsPanel({
 								className="w-full mt-2 gap-1.5 bg-white/5 text-slate-200 border-white/10 hover:bg-white/10 hover:border-white/20 hover:text-white text-[10px] h-8 transition-all"
 							>
 								<Crop className="w-3 h-3" />
-								Crop Video
+								{t("crop.cropVideo")}
 							</Button>
 						</AccordionContent>
 					</AccordionItem>
@@ -672,7 +874,7 @@ export function SettingsPanel({
 						<AccordionTrigger className="py-2.5 hover:no-underline">
 							<div className="flex items-center gap-2">
 								<Palette className="w-4 h-4 text-[#34B27B]" />
-								<span className="text-xs font-medium">Background</span>
+								<span className="text-xs font-medium">{t("background.title")}</span>
 							</div>
 						</AccordionTrigger>
 						<AccordionContent className="pb-3">
@@ -682,19 +884,19 @@ export function SettingsPanel({
 										value="image"
 										className="data-[state=active]:bg-[#34B27B] data-[state=active]:text-white text-slate-400 text-[10px] py-1 rounded-md transition-all"
 									>
-										Image
+										{t("background.image")}
 									</TabsTrigger>
 									<TabsTrigger
 										value="color"
 										className="data-[state=active]:bg-[#34B27B] data-[state=active]:text-white text-slate-400 text-[10px] py-1 rounded-md transition-all"
 									>
-										Color
+										{t("background.color")}
 									</TabsTrigger>
 									<TabsTrigger
 										value="gradient"
 										className="data-[state=active]:bg-[#34B27B] data-[state=active]:text-white text-slate-400 text-[10px] py-1 rounded-md transition-all"
 									>
-										Gradient
+										{t("background.gradient")}
 									</TabsTrigger>
 								</TabsList>
 
@@ -713,7 +915,7 @@ export function SettingsPanel({
 											className="w-full gap-2 bg-white/5 text-slate-200 border-white/10 hover:bg-[#34B27B] hover:text-white hover:border-[#34B27B] transition-all h-7 text-[10px]"
 										>
 											<Upload className="w-3 h-3" />
-											Upload Custom
+											{t("background.uploadCustom")}
 										</Button>
 
 										<div className="grid grid-cols-7 gap-1.5">
@@ -814,7 +1016,7 @@ export function SettingsPanel({
 															: "border-white/10 hover:border-[#34B27B]/40 opacity-80 hover:opacity-100 bg-white/5",
 													)}
 													style={{ background: g }}
-													aria-label={`Gradient ${idx + 1}`}
+													aria-label={t("background.gradientLabel", { index: idx + 1 })}
 													onClick={() => {
 														setGradient(g);
 														onWallpaperChange(g);
@@ -840,10 +1042,8 @@ export function SettingsPanel({
 					<div className="fixed top-1/2 left-1/2 transform -translate-x-1/2 -translate-y-1/2 z-[60] bg-[#09090b] rounded-2xl shadow-2xl border border-white/10 p-8 w-[90vw] max-w-5xl max-h-[90vh] overflow-auto animate-in zoom-in-95 duration-200">
 						<div className="flex items-center justify-between mb-6">
 							<div>
-								<span className="text-xl font-bold text-slate-200">Crop Video</span>
-								<p className="text-sm text-slate-400 mt-2">
-									Drag on each side to adjust the crop area
-								</p>
+								<span className="text-xl font-bold text-slate-200">{t("crop.cropVideo")}</span>
+								<p className="text-sm text-slate-400 mt-2">{t("crop.dragInstruction")}</p>
 							</div>
 							<Button
 								variant="ghost"
@@ -885,7 +1085,7 @@ export function SettingsPanel({
 
 								<div className="flex flex-col gap-1">
 									<label className="text-[10px] font-medium text-slate-400 uppercase tracking-wider">
-										Ratio
+										{t("crop.ratio")}
 									</label>
 									<div className="flex items-center gap-1.5">
 										<select
@@ -894,7 +1094,7 @@ export function SettingsPanel({
 											className="h-8 rounded-md border border-white/10 bg-[#1a1a1f] px-2 text-xs text-slate-200 outline-none focus:border-[#34B27B]/50 cursor-pointer"
 										>
 											<option value="" className="bg-[#1a1a1f] text-slate-200">
-												Free
+												{t("crop.free")}
 											</option>
 											<option value="16:9" className="bg-[#1a1a1f] text-slate-200">
 												16:9
@@ -924,7 +1124,9 @@ export function SettingsPanel({
 													? "border-[#34B27B]/50 bg-[#34B27B]/10 text-[#34B27B]"
 													: "border-white/10 bg-white/5 text-slate-400 hover:text-slate-200",
 											)}
-											title={cropAspectLocked ? "Unlock aspect ratio" : "Lock aspect ratio"}
+											title={
+												cropAspectLocked ? t("crop.unlockAspectRatio") : t("crop.lockAspectRatio")
+											}
 										>
 											{cropAspectLocked ? (
 												<Lock className="w-3.5 h-3.5" />
@@ -946,7 +1148,7 @@ export function SettingsPanel({
 									size="lg"
 									className="bg-[#34B27B] hover:bg-[#34B27B]/90 text-white"
 								>
-									Done
+									{t("crop.done")}
 								</Button>
 							</div>
 						</div>
@@ -966,7 +1168,7 @@ export function SettingsPanel({
 						)}
 					>
 						<Film className="w-3.5 h-3.5" />
-						MP4
+						{t("exportFormat.mp4")}
 					</button>
 					<button
 						data-testid={getTestId("gif-format-button")}
@@ -979,7 +1181,7 @@ export function SettingsPanel({
 						)}
 					>
 						<Image className="w-3.5 h-3.5" />
-						GIF
+						{t("exportFormat.gif")}
 					</button>
 				</div>
 
@@ -994,7 +1196,7 @@ export function SettingsPanel({
 									: "text-slate-400 hover:text-slate-200",
 							)}
 						>
-							Low
+							{t("exportQuality.low")}
 						</button>
 						<button
 							onClick={() => onExportQualityChange?.("good")}
@@ -1005,7 +1207,7 @@ export function SettingsPanel({
 									: "text-slate-400 hover:text-slate-200",
 							)}
 						>
-							Medium
+							{t("exportQuality.medium")}
 						</button>
 						<button
 							onClick={() => onExportQualityChange?.("source")}
@@ -1016,7 +1218,7 @@ export function SettingsPanel({
 									: "text-slate-400 hover:text-slate-200",
 							)}
 						>
-							High
+							{t("exportQuality.high")}
 						</button>
 					</div>
 				)}
@@ -1063,7 +1265,7 @@ export function SettingsPanel({
 								{gifOutputDimensions.width} × {gifOutputDimensions.height}px
 							</span>
 							<div className="flex items-center gap-2">
-								<span className="text-[10px] text-slate-400">Loop</span>
+								<span className="text-[10px] text-slate-400">{t("gifSettings.loop")}</span>
 								<Switch
 									checked={gifLoop}
 									onCheckedChange={onGifLoopChange}
@@ -1074,27 +1276,17 @@ export function SettingsPanel({
 					</div>
 				)}
 
-				<div className="grid grid-cols-2 gap-2 mb-2">
+				{unsavedExport && (
 					<Button
 						type="button"
-						variant="outline"
-						onClick={onLoadProject}
-						className="h-8 text-[10px] font-medium gap-1.5 bg-white/5 border-white/10 text-slate-300 hover:bg-white/10"
+						size="lg"
+						onClick={onSaveUnsavedExport}
+						className="w-full mb-2 py-5 text-sm font-semibold flex items-center justify-center gap-2 bg-indigo-500 text-white rounded-xl shadow-lg shadow-indigo-500/20 hover:bg-indigo-500/90 hover:scale-[1.02] active:scale-[0.98] transition-all duration-200"
 					>
-						<FolderOpen className="w-3.5 h-3.5" />
-						Load Project
+						<Download className="w-4 h-4" />
+						{t("export.chooseSaveLocation")}
 					</Button>
-					<Button
-						type="button"
-						variant="outline"
-						onClick={onSaveProject}
-						className="h-8 text-[10px] font-medium gap-1.5 bg-white/5 border-white/10 text-slate-300 hover:bg-white/10"
-					>
-						<Save className="w-3.5 h-3.5" />
-						Save Project
-					</Button>
-				</div>
-
+				)}
 				<Button
 					data-testid={getTestId("export-button")}
 					type="button"
@@ -1103,7 +1295,7 @@ export function SettingsPanel({
 					className="w-full py-5 text-sm font-semibold flex items-center justify-center gap-2 bg-[#34B27B] text-white rounded-xl shadow-lg shadow-[#34B27B]/20 hover:bg-[#34B27B]/90 hover:scale-[1.02] active:scale-[0.98] transition-all duration-200"
 				>
 					<Download className="w-4 h-4" />
-					Export {exportFormat === "gif" ? "GIF" : "Video"}
+					{exportFormat === "gif" ? t("export.gifButton") : t("export.videoButton")}
 				</Button>
 
 				<div className="flex gap-2 mt-3">
@@ -1117,7 +1309,7 @@ export function SettingsPanel({
 						className="flex-1 flex items-center justify-center gap-1.5 text-[10px] text-slate-500 hover:text-slate-300 py-1.5 transition-colors"
 					>
 						<Bug className="w-3 h-3 text-[#34B27B]" />
-						Report Bug
+						{t("links.reportBug")}
 					</button>
 					<button
 						type="button"
@@ -1127,7 +1319,7 @@ export function SettingsPanel({
 						className="flex-1 flex items-center justify-center gap-1.5 text-[10px] text-slate-500 hover:text-slate-300 py-1.5 transition-colors"
 					>
 						<Star className="w-3 h-3 text-yellow-400" />
-						Star on GitHub
+						{t("links.starOnGithub")}
 					</button>
 				</div>
 			</div>

src/components/video-editor/ShortcutsConfigDialog.tsx

@@ -9,6 +9,7 @@ import {
 	DialogHeader,
 	DialogTitle,
 } from "@/components/ui/dialog";
+import { useScopedT } from "@/contexts/I18nContext";
 import { useShortcuts } from "@/contexts/ShortcutsContext";
 import {
 	DEFAULT_SHORTCUTS,
@@ -16,7 +17,6 @@ import {
 	findConflict,
 	formatBinding,
 	SHORTCUT_ACTIONS,
-	SHORTCUT_LABELS,
 	type ShortcutAction,
 	type ShortcutBinding,
 	type ShortcutConflict,
@@ -28,6 +28,8 @@ const MODIFIER_KEYS = new Set(["Control", "Shift", "Alt", "Meta"]);
 export function ShortcutsConfigDialog() {
 	const { shortcuts, isMac, isConfigOpen, closeConfig, setShortcuts, persistShortcuts } =
 		useShortcuts();
+	const t = useScopedT("shortcuts");
+	const tc = useScopedT("common");
 
 	const [draft, setDraft] = useState<ShortcutsConfig>(shortcuts);
 	const [captureFor, setCaptureFor] = useState<ShortcutAction | null>(null);
@@ -70,7 +72,7 @@ export function ShortcutsConfigDialog() {
 			setCaptureFor(null);
 
 			if (found?.type === "fixed") {
-				toast.error(`This shortcut is reserved for "${found.label}" and cannot be reassigned.`);
+				toast.error(t("reservedShortcut", { label: found.label }));
 				return;
 			}
 
@@ -84,7 +86,7 @@ export function ShortcutsConfigDialog() {
 
 		window.addEventListener("keydown", handleCapture, { capture: true });
 		return () => window.removeEventListener("keydown", handleCapture, { capture: true });
-	}, [captureFor, draft]);
+	}, [captureFor, draft, t]);
 
 	const handleSwap = useCallback(() => {
 		if (!conflict || conflict.conflictWith.type !== "configurable") return;
@@ -102,14 +104,14 @@ export function ShortcutsConfigDialog() {
 	const handleSave = useCallback(async () => {
 		setShortcuts(draft);
 		await persistShortcuts(draft);
-		toast.success("Keyboard shortcuts saved");
+		toast.success(t("savedToast"));
 		closeConfig();
-	}, [draft, setShortcuts, persistShortcuts, closeConfig]);
+	}, [draft, setShortcuts, persistShortcuts, closeConfig, t]);
 
 	const handleReset = useCallback(() => {
 		setDraft({ ...DEFAULT_SHORTCUTS });
-		toast.info("Reset to default shortcuts — click Save to apply");
-	}, []);
+		toast.info(t("resetToast"));
+	}, [t]);
 
 	const handleClose = useCallback(() => {
 		setCaptureFor(null);
@@ -128,13 +130,13 @@ export function ShortcutsConfigDialog() {
 				<DialogHeader>
 					<DialogTitle className="flex items-center gap-2 text-sm">
 						<Keyboard className="w-4 h-4 text-[#34B27B]" />
-						Keyboard Shortcuts
+						{t("title")}
 					</DialogTitle>
 				</DialogHeader>
 
 				<div className="space-y-0.5">
 					<p className="text-[10px] text-slate-500 mb-2 uppercase tracking-wide font-semibold">
-						Configurable
+						{t("configurable")}
 					</p>
 					{SHORTCUT_ACTIONS.map((action) => {
 						const isCapturing = captureFor === action;
@@ -142,14 +144,14 @@ export function ShortcutsConfigDialog() {
 						return (
 							<div key={action}>
 								<div className="flex items-center justify-between py-1.5 px-1 border-b border-white/5">
-									<span className="text-sm text-slate-300">{SHORTCUT_LABELS[action]}</span>
+									<span className="text-sm text-slate-300">{t(`actions.${action}`)}</span>
 									<button
 										type="button"
 										onClick={() => {
 											setConflict(null);
 											setCaptureFor(isCapturing ? null : action);
 										}}
-										title={isCapturing ? "Press Esc to cancel" : "Click to change"}
+										title={isCapturing ? t("pressEscToCancel") : t("clickToChange")}
 										className={[
 											"px-2 py-1 rounded text-xs font-mono border transition-all min-w-[90px] text-center select-none",
 											isCapturing
@@ -159,14 +161,14 @@ export function ShortcutsConfigDialog() {
 													: "bg-white/5 border-white/10 text-slate-200 hover:border-[#34B27B]/50 hover:text-[#34B27B] cursor-pointer",
 										].join(" ")}
 									>
-										{isCapturing ? "Press a key…" : formatBinding(draft[action], isMac)}
+										{isCapturing ? t("pressKey") : formatBinding(draft[action], isMac)}
 									</button>
 								</div>
 								{hasConflict && conflict?.conflictWith.type === "configurable" && (
 									<div className="flex items-center justify-between px-1 py-1.5 mb-0.5 bg-amber-500/10 border border-amber-500/20 rounded text-xs">
 										<span className="text-amber-400">
-											⚠ Already used by{" "}
-											<strong>{SHORTCUT_LABELS[conflict.conflictWith.action]}</strong>
+											⚠{" "}
+											{t("alreadyUsedBy", { action: t(`actions.${conflict.conflictWith.action}`) })}
 										</span>
 										<div className="flex gap-1.5">
 											<button
@@ -174,14 +176,14 @@ export function ShortcutsConfigDialog() {
 												onClick={handleSwap}
 												className="px-2 py-0.5 bg-amber-500/20 hover:bg-amber-500/30 border border-amber-500/40 rounded text-amber-300 font-medium transition-colors"
 											>
-												Swap
+												{t("swap")}
 											</button>
 											<button
 												type="button"
 												onClick={handleCancelConflict}
 												className="px-2 py-0.5 bg-white/5 hover:bg-white/10 border border-white/10 rounded text-slate-400 transition-colors"
 											>
-												Cancel
+												{tc("actions.cancel")}
 											</button>
 										</div>
 									</div>
@@ -193,14 +195,16 @@ export function ShortcutsConfigDialog() {
 
 				<div className="space-y-0.5 mt-2">
 					<p className="text-[10px] text-slate-500 mb-2 uppercase tracking-wide font-semibold">
-						Fixed
+						{t("fixed")}
 					</p>
-					{FIXED_SHORTCUTS.map(({ label, display }) => (
+					{FIXED_SHORTCUTS.map(({ i18nKey, label, display }) => (
 						<div
-							key={label}
+							key={i18nKey}
 							className="flex items-center justify-between py-1.5 px-1 border-b border-white/5 last:border-0"
 						>
-							<span className="text-sm text-slate-400">{label}</span>
+							<span className="text-sm text-slate-400">
+								{t(`fixedActions.${i18nKey}`, { defaultValue: label })}
+							</span>
 							<kbd className="px-2 py-1 bg-white/5 border border-white/10 rounded text-xs font-mono text-slate-400 min-w-[90px] text-center">
 								{display}
 							</kbd>
@@ -208,10 +212,7 @@ export function ShortcutsConfigDialog() {
 					))}
 				</div>
 
-				<p className="text-[10px] text-slate-500 mt-1">
-					Click a shortcut then press the new key combination. Press{" "}
-					<span className="font-mono border border-white/10 rounded px-1">Esc</span> to cancel.
-				</p>
+				<p className="text-[10px] text-slate-500 mt-1">{t("helpText")}</p>
 
 				<DialogFooter className="flex gap-2 sm:justify-between mt-2">
 					<Button
@@ -221,18 +222,18 @@ export function ShortcutsConfigDialog() {
 						onClick={handleReset}
 					>
 						<RotateCcw className="w-3 h-3" />
-						Reset to defaults
+						{t("resetToDefaults")}
 					</Button>
 					<div className="flex gap-2">
 						<Button variant="ghost" size="sm" onClick={handleClose}>
-							Cancel
+							{tc("actions.cancel")}
 						</Button>
 						<Button
 							size="sm"
 							className="bg-[#34B27B] hover:bg-[#2d9e6c] text-white"
 							onClick={handleSave}
 						>
-							Save
+							{tc("actions.save")}
 						</Button>
 					</div>
 				</DialogFooter>

src/components/video-editor/TutorialHelp.tsx

@@ -8,8 +8,10 @@ import {
 	DialogTitle,
 	DialogTrigger,
 } from "@/components/ui/dialog";
+import { useScopedT } from "@/contexts/I18nContext";
 
 export function TutorialHelp() {
+	const t = useScopedT("dialogs");
 	return (
 		<Dialog>
 			<DialogTrigger asChild>
@@ -19,33 +21,33 @@ export function TutorialHelp() {
 					className="h-7 px-2 text-xs text-slate-400 hover:text-slate-200 hover:bg-white/10 transition-all gap-1.5"
 				>
 					<HelpCircle className="w-3.5 h-3.5" />
-					<span className="font-medium">How trimming works</span>
+					<span className="font-medium">{t("tutorial.triggerLabel")}</span>
 				</Button>
 			</DialogTrigger>
 			<DialogContent className="max-w-2xl bg-[#09090b] border-white/10 [&>button]:text-slate-400 [&>button:hover]:text-white">
 				<DialogHeader>
 					<DialogTitle className="text-xl font-semibold text-slate-200 flex items-center gap-2">
-						<Scissors className="w-5 h-5 text-[#ef4444]" /> How Trimming Works
+						<Scissors className="w-5 h-5 text-[#ef4444]" /> {t("tutorial.title")}
 					</DialogTitle>
 					<DialogDescription className="text-slate-400">
-						Understanding how to cut out unwanted parts of your video.
+						{t("tutorial.description")}
 					</DialogDescription>
 				</DialogHeader>
 				<div className="mt-4 space-y-8">
 					{/* Explanation */}
 					<div className="bg-white/5 rounded-lg p-4 border border-white/5">
 						<p className="text-slate-300 leading-relaxed">
-							The Trim tool works by defining the segments you want to
-							<span className="text-[#ef4444] font-bold"> remove</span>. Any part of the timeline
-							that is
-							<span className="text-[#ef4444] font-bold"> covered</span> by a red trim segment will
-							be cut out when you export.
+							{t("tutorial.explanationBefore")}
+							<span className="text-[#ef4444] font-bold"> {t("tutorial.remove")}</span>
+							{t("tutorial.explanationMiddle")}
+							<span className="text-[#ef4444] font-bold"> {t("tutorial.covered")}</span>
+							{t("tutorial.explanationAfter")}
 						</p>
 					</div>
 					{/* Visual Illustration */}
 					<div className="space-y-2">
 						<h3 className="text-sm font-medium text-slate-400 uppercase tracking-wider">
-							Visual Example
+							{t("tutorial.visualExample")}
 						</h3>
 						<div className="relative h-24 bg-[#000] rounded-lg border border-white/10 flex items-center px-4 overflow-hidden select-none">
 							{/* Background track (Kept parts) */}
@@ -58,7 +60,7 @@ export function TutorialHelp() {
 								style={{ width: "20%" }}
 							>
 								<span className="text-[10px] font-bold text-[#ef4444] bg-black/50 px-1 rounded">
-									REMOVED
+									{t("tutorial.removed")}
 								</span>
 							</div>
 							{/* Removed Segment 2 */}
@@ -67,13 +69,19 @@ export function TutorialHelp() {
 								style={{ width: "15%" }}
 							>
 								<span className="text-[10px] font-bold text-[#ef4444] bg-black/50 px-1 rounded">
-									REMOVED
+									{t("tutorial.removed")}
 								</span>
 							</div>
 							{/* Labels for kept parts */}
-							<div className="absolute left-[5%] text-[10px] text-slate-400 font-medium">Kept</div>
-							<div className="absolute left-[50%] text-[10px] text-slate-400 font-medium">Kept</div>
-							<div className="absolute left-[90%] text-[10px] text-slate-400 font-medium">Kept</div>
+							<div className="absolute left-[5%] text-[10px] text-slate-400 font-medium">
+								{t("tutorial.kept")}
+							</div>
+							<div className="absolute left-[50%] text-[10px] text-slate-400 font-medium">
+								{t("tutorial.kept")}
+							</div>
+							<div className="absolute left-[90%] text-[10px] text-slate-400 font-medium">
+								{t("tutorial.kept")}
+							</div>
 						</div>
 						<div className="flex justify-center mt-2">
 							<ArrowRight className="w-4 h-4 text-slate-600 rotate-90" />
@@ -84,38 +92,38 @@ export function TutorialHelp() {
 								className="h-8 bg-slate-700 rounded flex items-center justify-center opacity-80"
 								style={{ width: "30%" }}
 							>
-								<span className="text-[10px] text-white font-medium">Part 1</span>
+								<span className="text-[10px] text-white font-medium">{t("tutorial.part1")}</span>
 							</div>
 							<div
 								className="h-8 bg-slate-700 rounded flex items-center justify-center opacity-80"
 								style={{ width: "30%" }}
 							>
-								<span className="text-[10px] text-white font-medium">Part 2</span>
+								<span className="text-[10px] text-white font-medium">{t("tutorial.part2")}</span>
 							</div>
 							<div
 								className="h-8 bg-slate-700 rounded flex items-center justify-center opacity-80"
 								style={{ width: "30%" }}
 							>
-								<span className="text-[10px] text-white font-medium">Part 3</span>
+								<span className="text-[10px] text-white font-medium">{t("tutorial.part3")}</span>
 							</div>
-							<span className="absolute right-4 text-xs text-slate-400">Final Video</span>
+							<span className="absolute right-4 text-xs text-slate-400">
+								{t("tutorial.finalVideo")}
+							</span>
 						</div>
 					</div>
 					{/* Steps */}
 					<div className="grid grid-cols-2 gap-4">
 						<div className="p-3 rounded bg-white/5 border border-white/5">
-							<div className="text-[#ef4444] font-bold mb-1">1. Add Trim</div>
+							<div className="text-[#ef4444] font-bold mb-1">{t("tutorial.step1Title")}</div>
 							<p className="text-xs text-slate-400">
-								Press
+								{t("tutorial.step1DescriptionBefore")}
 								<kbd className="bg-white/10 px-1 rounded text-slate-300">T</kbd>
-								or click the scissors icon to mark a section for removal.
+								{t("tutorial.step1DescriptionAfter")}
 							</p>
 						</div>
 						<div className="p-3 rounded bg-white/5 border border-white/5">
-							<div className="text-[#ef4444] font-bold mb-1">2. Adjust</div>
-							<p className="text-xs text-slate-400">
-								Drag the edges of the red region to cover exactly what you want to cut out.
-							</p>
+							<div className="text-[#ef4444] font-bold mb-1">{t("tutorial.step2Title")}</div>
+							<p className="text-xs text-slate-400">{t("tutorial.step2Description")}</p>
 						</div>
 					</div>
 				</div>

src/components/video-editor/VideoEditor.tsx

@@ -1,10 +1,13 @@
 import type { Span } from "dnd-timeline";
+import { FolderOpen, Languages, Save } from "lucide-react";
 import { useCallback, useEffect, useMemo, useRef, useState } from "react";
 import { Panel, PanelGroup, PanelResizeHandle } from "react-resizable-panels";
 import { toast } from "sonner";
-import { Toaster } from "@/components/ui/sonner";
+import { useI18n, useScopedT } from "@/contexts/I18nContext";
 import { useShortcuts } from "@/contexts/ShortcutsContext";
 import { INITIAL_EDITOR_STATE, useEditorHistory } from "@/hooks/useEditorHistory";
+import { type Locale, SUPPORTED_LOCALES } from "@/i18n/config";
+import { getLocaleName } from "@/i18n/loader";
 import {
 	calculateOutputDimensions,
 	type ExportFormat,
@@ -17,15 +20,22 @@ import {
 	type GifSizePreset,
 	VideoExporter,
 } from "@/lib/exporter";
+import { computeFrameStepTime } from "@/lib/frameStep";
 import type { ProjectMedia } from "@/lib/recordingSession";
 import { matchesShortcut } from "@/lib/shortcuts";
-import { getAspectRatioValue, getNativeAspectRatioValue } from "@/utils/aspectRatioUtils";
+import {
+	getAspectRatioValue,
+	getNativeAspectRatioValue,
+	isPortraitAspectRatio,
+} from "@/utils/aspectRatioUtils";
 import { ExportDialog } from "./ExportDialog";
 import PlaybackControls from "./PlaybackControls";
 import {
 	createProjectData,
+	createProjectSnapshot,
 	deriveNextId,
 	fromFileUrl,
+	hasProjectUnsavedChanges,
 	normalizeProjectEditor,
 	resolveProjectMedia,
 	toFileUrl,
@@ -49,6 +59,7 @@ import {
 	type TrimRegion,
 	type ZoomDepth,
 	type ZoomFocus,
+	type ZoomFocusMode,
 	type ZoomRegion,
 } from "./types";
 import VideoPlayback, { VideoPlaybackRef } from "./VideoPlayback";
@@ -76,6 +87,9 @@ export default function VideoEditor() {
 		borderRadius,
 		padding,
 		aspectRatio,
+		webcamLayoutPreset,
+		webcamMaskShape,
+		webcamPosition,
 	} = editorState;
 
 	// ── Non-undoable state
@@ -89,6 +103,10 @@ export default function VideoEditor() {
 	const [isPlaying, setIsPlaying] = useState(false);
 	const [currentTime, setCurrentTime] = useState(0);
 	const [duration, setDuration] = useState(0);
+	const currentTimeRef = useRef(currentTime);
+	currentTimeRef.current = currentTime;
+	const durationRef = useRef(duration);
+	durationRef.current = duration;
 	const [cursorTelemetry, setCursorTelemetry] = useState<CursorTelemetryPoint[]>([]);
 	const [selectedZoomId, setSelectedZoomId] = useState<string | null>(null);
 	const [selectedTrimId, setSelectedTrimId] = useState<string | null>(null);
@@ -105,13 +123,25 @@ export default function VideoEditor() {
 	const [gifSizePreset, setGifSizePreset] = useState<GifSizePreset>("medium");
 	const [exportedFilePath, setExportedFilePath] = useState<string | null>(null);
 	const [lastSavedSnapshot, setLastSavedSnapshot] = useState<string | null>(null);
+	const [unsavedExport, setUnsavedExport] = useState<{
+		arrayBuffer: ArrayBuffer;
+		fileName: string;
+		format: string;
+	} | null>(null);
+	const [isFullscreen, setIsFullscreen] = useState(false);
 
+	const playerContainerRef = useRef<HTMLDivElement>(null);
 	const videoPlaybackRef = useRef<VideoPlaybackRef>(null);
+
 	const nextZoomIdRef = useRef(1);
 	const nextTrimIdRef = useRef(1);
 	const nextSpeedIdRef = useRef(1);
 
 	const { shortcuts, isMac } = useShortcuts();
+	const t = useScopedT("editor");
+	const ts = useScopedT("settings");
+	const { locale, setLocale } = useI18n();
+
 	const nextAnnotationIdRef = useRef(1);
 	const nextAnnotationZIndexRef = useRef(1);
 	const exporterRef = useRef<VideoExporter | null>(null);
@@ -173,6 +203,9 @@ export default function VideoEditor() {
 				speedRegions: normalizedEditor.speedRegions,
 				annotationRegions: normalizedEditor.annotationRegions,
 				aspectRatio: normalizedEditor.aspectRatio,
+				webcamLayoutPreset: normalizedEditor.webcamLayoutPreset,
+				webcamMaskShape: normalizedEditor.webcamMaskShape,
+				webcamPosition: normalizedEditor.webcamPosition,
 			});
 			setExportQuality(normalizedEditor.exportQuality);
 			setExportFormat(normalizedEditor.exportFormat);
@@ -208,13 +241,11 @@ export default function VideoEditor() {
 				) + 1;
 
 			setLastSavedSnapshot(
-				JSON.stringify(
-					createProjectData(
-						webcamSourcePath
-							? { screenVideoPath: sourcePath, webcamVideoPath: webcamSourcePath }
-							: { screenVideoPath: sourcePath },
-						normalizedEditor,
-					),
+				createProjectSnapshot(
+					webcamSourcePath
+						? { screenVideoPath: sourcePath, webcamVideoPath: webcamSourcePath }
+						: { screenVideoPath: sourcePath },
+					normalizedEditor,
 				),
 			);
 			return true;
@@ -226,27 +257,28 @@ export default function VideoEditor() {
 		if (!currentProjectMedia) {
 			return null;
 		}
-		return JSON.stringify(
-			createProjectData(currentProjectMedia, {
-				wallpaper,
-				shadowIntensity,
-				showBlur,
-				motionBlurAmount,
-				borderRadius,
-				padding,
-				cropRegion,
-				zoomRegions,
-				trimRegions,
-				speedRegions,
-				annotationRegions,
-				aspectRatio,
-				exportQuality,
-				exportFormat,
-				gifFrameRate,
-				gifLoop,
-				gifSizePreset,
-			}),
-		);
+		return createProjectSnapshot(currentProjectMedia, {
+			wallpaper,
+			shadowIntensity,
+			showBlur,
+			motionBlurAmount,
+			borderRadius,
+			padding,
+			cropRegion,
+			zoomRegions,
+			trimRegions,
+			speedRegions,
+			annotationRegions,
+			aspectRatio,
+			webcamLayoutPreset,
+			webcamMaskShape,
+			webcamPosition,
+			exportQuality,
+			exportFormat,
+			gifFrameRate,
+			gifLoop,
+			gifSizePreset,
+		});
 	}, [
 		currentProjectMedia,
 		wallpaper,
@@ -261,6 +293,9 @@ export default function VideoEditor() {
 		speedRegions,
 		annotationRegions,
 		aspectRatio,
+		webcamLayoutPreset,
+		webcamMaskShape,
+		webcamPosition,
 		exportQuality,
 		exportFormat,
 		gifFrameRate,
@@ -268,12 +303,7 @@ export default function VideoEditor() {
 		gifSizePreset,
 	]);
 
-	const hasUnsavedChanges = Boolean(
-		currentProjectPath &&
-			currentProjectSnapshot &&
-			lastSavedSnapshot &&
-			currentProjectSnapshot !== lastSavedSnapshot,
-	);
+	const hasUnsavedChanges = hasProjectUnsavedChanges(currentProjectSnapshot, lastSavedSnapshot);
 
 	useEffect(() => {
 		async function loadInitialData() {
@@ -301,7 +331,14 @@ export default function VideoEditor() {
 					setWebcamVideoSourcePath(webcamSourcePath);
 					setWebcamVideoPath(webcamSourcePath ? toFileUrl(webcamSourcePath) : null);
 					setCurrentProjectPath(null);
-					setLastSavedSnapshot(null);
+					setLastSavedSnapshot(
+						createProjectSnapshot(
+							webcamSourcePath
+								? { screenVideoPath: sourcePath, webcamVideoPath: webcamSourcePath }
+								: { screenVideoPath: sourcePath },
+							INITIAL_EDITOR_STATE,
+						),
+					);
 					return;
 				}
 
@@ -313,7 +350,9 @@ export default function VideoEditor() {
 					setWebcamVideoSourcePath(null);
 					setWebcamVideoPath(null);
 					setCurrentProjectPath(null);
-					setLastSavedSnapshot(null);
+					setLastSavedSnapshot(
+						createProjectSnapshot({ screenVideoPath: sourcePath }, INITIAL_EDITOR_STATE),
+					);
 				} else {
 					setError("No video to load. Please record or select a video.");
 				}
@@ -330,12 +369,12 @@ export default function VideoEditor() {
 	const saveProject = useCallback(
 		async (forceSaveAs: boolean) => {
 			if (!videoPath) {
-				toast.error("No video loaded");
+				toast.error(t("errors.noVideoLoaded"));
 				return false;
 			}
 
 			if (!currentProjectMedia) {
-				toast.error("Unable to determine source video path");
+				toast.error(t("errors.unableToDetermineSourcePath"));
 				return false;
 			}
 
@@ -352,6 +391,9 @@ export default function VideoEditor() {
 				speedRegions,
 				annotationRegions,
 				aspectRatio,
+				webcamLayoutPreset,
+				webcamMaskShape,
+				webcamPosition,
 				exportQuality,
 				exportFormat,
 				gifFrameRate,
@@ -372,12 +414,12 @@ export default function VideoEditor() {
 			);
 
 			if (result.canceled) {
-				toast.info("Project save canceled");
+				toast.info(t("project.saveCanceled"));
 				return false;
 			}
 
 			if (!result.success) {
-				toast.error(result.message || "Failed to save project");
+				toast.error(result.message || t("project.failedToSave"));
 				return false;
 			}
 
@@ -386,7 +428,7 @@ export default function VideoEditor() {
 			}
 			setLastSavedSnapshot(projectSnapshot);
 
-			toast.success(`Project saved to ${result.path}`);
+			toast.success(t("project.savedTo", { path: result.path ?? "" }));
 			return true;
 		},
 		[
@@ -404,12 +446,16 @@ export default function VideoEditor() {
 			speedRegions,
 			annotationRegions,
 			aspectRatio,
+			webcamLayoutPreset,
+			webcamMaskShape,
+			webcamPosition,
 			exportQuality,
 			exportFormat,
 			gifFrameRate,
 			gifLoop,
 			gifSizePreset,
 			videoPath,
+			t,
 		],
 	);
 
@@ -510,6 +556,21 @@ export default function VideoEditor() {
 		}
 	}
 
+	const toggleFullscreen = useCallback(() => {
+		setIsFullscreen((prev) => !prev);
+	}, []);
+
+	useEffect(() => {
+		if (!isFullscreen) return;
+		const handleKeyDown = (e: KeyboardEvent) => {
+			if (e.key === "Escape") {
+				setIsFullscreen(false);
+			}
+		};
+		window.addEventListener("keydown", handleKeyDown);
+		return () => window.removeEventListener("keydown", handleKeyDown);
+	}, [isFullscreen]);
+
 	function handleSeek(time: number) {
 		const video = videoPlaybackRef.current?.video;
 		if (!video) return;
@@ -641,6 +702,18 @@ export default function VideoEditor() {
 		[selectedZoomId, pushState],
 	);
 
+	const handleZoomFocusModeChange = useCallback(
+		(focusMode: ZoomFocusMode) => {
+			if (!selectedZoomId) return;
+			pushState((prev) => ({
+				zoomRegions: prev.zoomRegions.map((region) =>
+					region.id === selectedZoomId ? { ...region, focusMode } : region,
+				),
+			}));
+		},
+		[selectedZoomId, pushState],
+	);
+
 	const handleZoomDelete = useCallback(
 		(id: string) => {
 			pushState((prev) => ({ zoomRegions: prev.zoomRegions.filter((r) => r.id !== id) }));
@@ -879,6 +952,40 @@ export default function VideoEditor() {
 				return;
 			}
 
+			// Frame-step navigation (arrow keys, no modifiers)
+			if (
+				(e.key === "ArrowLeft" || e.key === "ArrowRight") &&
+				!e.ctrlKey &&
+				!e.metaKey &&
+				!e.shiftKey &&
+				!e.altKey
+			) {
+				const target = e.target;
+				if (
+					target instanceof HTMLInputElement ||
+					target instanceof HTMLTextAreaElement ||
+					target instanceof HTMLSelectElement ||
+					(target instanceof HTMLElement &&
+						(target.isContentEditable ||
+							target.closest('[role="separator"], [role="slider"], [role="spinbutton"]')))
+				) {
+					return;
+				}
+				e.preventDefault();
+				const video = videoPlaybackRef.current?.video;
+				if (!video) {
+					return;
+				}
+				const direction = e.key === "ArrowLeft" ? "backward" : "forward";
+				const newTime = computeFrameStepTime(
+					video.currentTime,
+					Number.isFinite(video.duration) ? video.duration : durationRef.current,
+					direction,
+				);
+				video.currentTime = newTime;
+				return;
+			}
+
 			const isInput =
 				e.target instanceof HTMLInputElement || e.target instanceof HTMLTextAreaElement;
 
@@ -961,6 +1068,27 @@ export default function VideoEditor() {
 		[handleShowExportedFile],
 	);
 
+	const handleSaveUnsavedExport = useCallback(async () => {
+		if (!unsavedExport) return;
+		try {
+			const saveResult = await window.electronAPI.saveExportedVideo(
+				unsavedExport.arrayBuffer,
+				unsavedExport.fileName,
+			);
+			if (saveResult.canceled) {
+				toast.info("Export canceled");
+			} else if (saveResult.success && saveResult.path) {
+				setUnsavedExport(null);
+				handleExportSaved(unsavedExport.format === "gif" ? "GIF" : "Video", saveResult.path);
+			} else {
+				toast.error(saveResult.message || "Failed to save export");
+			}
+		} catch (error) {
+			console.error("Error saving unsaved export:", error);
+			toast.error("Failed to save exported video");
+		}
+	}, [unsavedExport, handleExportSaved]);
+
 	const handleExport = useCallback(
 		async (settings: ExportSettings) => {
 			if (!videoPath) {
@@ -1021,8 +1149,12 @@ export default function VideoEditor() {
 						videoPadding: padding,
 						cropRegion,
 						annotationRegions,
+						webcamLayoutPreset,
+						webcamMaskShape,
+						webcamPosition,
 						previewWidth,
 						previewHeight,
+						cursorTelemetry,
 						onProgress: (progress: ExportProgress) => {
 							setExportProgress(progress);
 						},
@@ -1039,8 +1171,10 @@ export default function VideoEditor() {
 						const saveResult = await window.electronAPI.saveExportedVideo(arrayBuffer, fileName);
 
 						if (saveResult.canceled) {
+							setUnsavedExport({ arrayBuffer, fileName, format: "gif" });
 							toast.info("Export canceled");
-						} else if (saveResult.success) {
+						} else if (saveResult.success && saveResult.path) {
+							setUnsavedExport(null);
 							handleExportSaved("GIF", saveResult.path);
 						} else {
 							setExportError(saveResult.message || "Failed to save GIF");
@@ -1148,8 +1282,12 @@ export default function VideoEditor() {
 						padding,
 						cropRegion,
 						annotationRegions,
+						webcamLayoutPreset,
+						webcamMaskShape,
+						webcamPosition,
 						previewWidth,
 						previewHeight,
+						cursorTelemetry,
 						onProgress: (progress: ExportProgress) => {
 							setExportProgress(progress);
 						},
@@ -1166,8 +1304,10 @@ export default function VideoEditor() {
 						const saveResult = await window.electronAPI.saveExportedVideo(arrayBuffer, fileName);
 
 						if (saveResult.canceled) {
+							setUnsavedExport({ arrayBuffer, fileName, format: "mp4" });
 							toast.info("Export canceled");
-						} else if (saveResult.success) {
+						} else if (saveResult.success && saveResult.path) {
+							setUnsavedExport(null);
 							handleExportSaved("Video", saveResult.path);
 						} else {
 							setExportError(saveResult.message || "Failed to save video");
@@ -1212,8 +1352,12 @@ export default function VideoEditor() {
 			annotationRegions,
 			isPlaying,
 			aspectRatio,
+			webcamLayoutPreset,
+			webcamMaskShape,
+			webcamPosition,
 			exportQuality,
 			handleExportSaved,
+			cursorTelemetry,
 		],
 	);
 
@@ -1232,11 +1376,16 @@ export default function VideoEditor() {
 		// Build export settings from current state
 		const sourceWidth = video.videoWidth || 1920;
 		const sourceHeight = video.videoHeight || 1080;
+		const aspectRatioValue =
+			aspectRatio === "native"
+				? getNativeAspectRatioValue(sourceWidth, sourceHeight, cropRegion)
+				: getAspectRatioValue(aspectRatio);
 		const gifDimensions = calculateOutputDimensions(
 			sourceWidth,
 			sourceHeight,
 			gifSizePreset,
 			GIF_SIZE_PRESETS,
+			aspectRatioValue,
 		);
 
 		const settings: ExportSettings = {
@@ -1260,7 +1409,17 @@ export default function VideoEditor() {
 
 		// Start export immediately
 		handleExport(settings);
-	}, [videoPath, exportFormat, exportQuality, gifFrameRate, gifLoop, gifSizePreset, handleExport]);
+	}, [
+		videoPath,
+		exportFormat,
+		exportQuality,
+		gifFrameRate,
+		gifLoop,
+		gifSizePreset,
+		aspectRatio,
+		cropRegion,
+		handleExport,
+	]);
 
 	const handleCancelExport = useCallback(() => {
 		if (exporterRef.current) {
@@ -1304,203 +1463,279 @@ export default function VideoEditor() {
 				className="h-10 flex-shrink-0 bg-[#09090b]/80 backdrop-blur-md border-b border-white/5 flex items-center justify-between px-6 z-50"
 				style={{ WebkitAppRegion: "drag" } as React.CSSProperties}
 			>
-				<div className="flex-1" />
+				<div
+					className="flex-1 flex items-center gap-1"
+					style={{ WebkitAppRegion: "no-drag" } as React.CSSProperties}
+				>
+					<div
+						className={`flex items-center gap-1 px-2 py-1 rounded-md text-white/50 hover:text-white/90 hover:bg-white/10 transition-all duration-150 ${isMac ? "ml-14" : "ml-2"}`}
+					>
+						<Languages size={14} />
+						<select
+							value={locale}
+							onChange={(e) => setLocale(e.target.value as Locale)}
+							className="bg-transparent text-[11px] font-medium outline-none cursor-pointer appearance-none pr-1"
+							style={{ color: "inherit" }}
+						>
+							{SUPPORTED_LOCALES.map((loc) => (
+								<option key={loc} value={loc} className="bg-[#09090b] text-white">
+									{getLocaleName(loc)}
+								</option>
+							))}
+						</select>
+					</div>
+					<button
+						type="button"
+						onClick={handleLoadProject}
+						className="flex items-center gap-1 px-2 py-1 rounded-md text-white/50 hover:text-white/90 hover:bg-white/10 transition-all duration-150 text-[11px] font-medium"
+					>
+						<FolderOpen size={14} />
+						{ts("project.load")}
+					</button>
+					<button
+						type="button"
+						onClick={handleSaveProject}
+						className="flex items-center gap-1 px-2 py-1 rounded-md text-white/50 hover:text-white/90 hover:bg-white/10 transition-all duration-150 text-[11px] font-medium"
+					>
+						<Save size={14} />
+						{ts("project.save")}
+					</button>
+				</div>
 			</div>
 
 			<div className="flex-1 p-5 gap-4 flex min-h-0 relative">
 				{/* Left Column - Video & Timeline */}
-				<PanelGroup direction="horizontal" className="gap-3">
-					<Panel>
-						<PanelGroup direction="vertical" className="gap-3">
-							{/* Top section: video preview and controls */}
-							<Panel defaultSize={70} maxSize={70} minSize={40}>
-								<div className="w-full h-full flex flex-col items-center justify-center bg-black/40 rounded-2xl border border-white/5 shadow-2xl overflow-hidden">
-									{/* Video preview */}
-									<div className="w-full flex justify-center items-center flex-auto mt-1.5">
-										<div
-											className="relative flex justify-center items-center w-auto h-full max-w-full box-border"
-											style={{
-												aspectRatio:
-													aspectRatio === "native"
-														? getNativeAspectRatioValue(
-																videoPlaybackRef.current?.video?.videoWidth || 1920,
-																videoPlaybackRef.current?.video?.videoHeight || 1080,
-																cropRegion,
-															)
-														: getAspectRatioValue(aspectRatio),
-											}}
-										>
-											<VideoPlayback
-												key={`${videoPath || "no-video"}:${webcamVideoPath || "no-webcam"}`}
-												aspectRatio={aspectRatio}
-												ref={videoPlaybackRef}
-												videoPath={videoPath || ""}
-												webcamVideoPath={webcamVideoPath || undefined}
-												onDurationChange={setDuration}
-												onTimeUpdate={setCurrentTime}
-												currentTime={currentTime}
-												onPlayStateChange={setIsPlaying}
-												onError={setError}
-												wallpaper={wallpaper}
-												zoomRegions={zoomRegions}
-												selectedZoomId={selectedZoomId}
-												onSelectZoom={handleSelectZoom}
-												onZoomFocusChange={handleZoomFocusChange}
-												onZoomFocusDragEnd={commitState}
-												isPlaying={isPlaying}
-												showShadow={shadowIntensity > 0}
-												shadowIntensity={shadowIntensity}
-												showBlur={showBlur}
-												motionBlurAmount={motionBlurAmount}
-												borderRadius={borderRadius}
-												padding={padding}
-												cropRegion={cropRegion}
-												trimRegions={trimRegions}
-												speedRegions={speedRegions}
-												annotationRegions={annotationRegions}
-												selectedAnnotationId={selectedAnnotationId}
-												onSelectAnnotation={handleSelectAnnotation}
-												onAnnotationPositionChange={handleAnnotationPositionChange}
-												onAnnotationSizeChange={handleAnnotationSizeChange}
-											/>
-										</div>
-									</div>
-									{/* Playback controls */}
-									<div className="w-full flex justify-center items-center h-12 flex-shrink-0 px-3 py-1.5 my-1.5">
-										<div className="w-full max-w-[700px]">
-											<PlaybackControls
-												isPlaying={isPlaying}
-												currentTime={currentTime}
-												duration={duration}
-												onTogglePlayPause={togglePlayPause}
-												onSeek={handleSeek}
-											/>
-										</div>
+				<div className="flex-[7] flex flex-col gap-3 min-w-0 h-full">
+					<PanelGroup direction="vertical" className="gap-3">
+						{/* Top section: video preview and controls */}
+						<Panel defaultSize={70} maxSize={70} minSize={40}>
+							<div
+								ref={playerContainerRef}
+								className={
+									isFullscreen
+										? "fixed inset-0 z-[99999] w-full h-full flex flex-col items-center justify-center bg-[#09090b]"
+										: "w-full h-full flex flex-col items-center justify-center bg-black/40 rounded-2xl border border-white/5 shadow-2xl overflow-hidden relative"
+								}
+							>
+								{/* Video preview */}
+								<div className="w-full flex justify-center items-center flex-auto mt-1.5">
+									<div
+										className="relative flex justify-center items-center w-auto h-full max-w-full box-border"
+										style={{
+											aspectRatio:
+												aspectRatio === "native"
+													? getNativeAspectRatioValue(
+															videoPlaybackRef.current?.video?.videoWidth || 1920,
+															videoPlaybackRef.current?.video?.videoHeight || 1080,
+															cropRegion,
+														)
+													: getAspectRatioValue(aspectRatio),
+										}}
+									>
+										<VideoPlayback
+											key={`${videoPath || "no-video"}:${webcamVideoPath || "no-webcam"}`}
+											aspectRatio={aspectRatio}
+											ref={videoPlaybackRef}
+											videoPath={videoPath || ""}
+											webcamVideoPath={webcamVideoPath || undefined}
+											webcamLayoutPreset={webcamLayoutPreset}
+											webcamMaskShape={webcamMaskShape}
+											webcamPosition={webcamPosition}
+											onWebcamPositionChange={(pos) => updateState({ webcamPosition: pos })}
+											onWebcamPositionDragEnd={commitState}
+											onDurationChange={setDuration}
+											onTimeUpdate={setCurrentTime}
+											currentTime={currentTime}
+											onPlayStateChange={setIsPlaying}
+											onError={setError}
+											wallpaper={wallpaper}
+											zoomRegions={zoomRegions}
+											selectedZoomId={selectedZoomId}
+											onSelectZoom={handleSelectZoom}
+											onZoomFocusChange={handleZoomFocusChange}
+											onZoomFocusDragEnd={commitState}
+											isPlaying={isPlaying}
+											showShadow={shadowIntensity > 0}
+											shadowIntensity={shadowIntensity}
+											showBlur={showBlur}
+											motionBlurAmount={motionBlurAmount}
+											borderRadius={borderRadius}
+											padding={padding}
+											cropRegion={cropRegion}
+											trimRegions={trimRegions}
+											speedRegions={speedRegions}
+											annotationRegions={annotationRegions}
+											selectedAnnotationId={selectedAnnotationId}
+											onSelectAnnotation={handleSelectAnnotation}
+											onAnnotationPositionChange={handleAnnotationPositionChange}
+											onAnnotationSizeChange={handleAnnotationSizeChange}
+											cursorTelemetry={cursorTelemetry}
+										/>
 									</div>
 								</div>
-							</Panel>
-
-							<PanelResizeHandle className="bg-[#09090b]/80 hover:bg-[#09090b] transition-colors rounded-full flex items-center justify-center">
-								<div className="w-8 h-1 bg-white/20 rounded-full"></div>
-							</PanelResizeHandle>
-
-							{/* Timeline section */}
-							<Panel defaultSize={30} maxSize={60} minSize={30}>
-								<div className="h-full bg-[#09090b] rounded-2xl border border-white/5 shadow-lg overflow-hidden flex flex-col">
-									<TimelineEditor
-										videoDuration={duration}
-										currentTime={currentTime}
-										onSeek={handleSeek}
-										cursorTelemetry={cursorTelemetry}
-										zoomRegions={zoomRegions}
-										onZoomAdded={handleZoomAdded}
-										onZoomSuggested={handleZoomSuggested}
-										onZoomSpanChange={handleZoomSpanChange}
-										onZoomDelete={handleZoomDelete}
-										selectedZoomId={selectedZoomId}
-										onSelectZoom={handleSelectZoom}
-										trimRegions={trimRegions}
-										onTrimAdded={handleTrimAdded}
-										onTrimSpanChange={handleTrimSpanChange}
-										onTrimDelete={handleTrimDelete}
-										selectedTrimId={selectedTrimId}
-										onSelectTrim={handleSelectTrim}
-										speedRegions={speedRegions}
-										onSpeedAdded={handleSpeedAdded}
-										onSpeedSpanChange={handleSpeedSpanChange}
-										onSpeedDelete={handleSpeedDelete}
-										selectedSpeedId={selectedSpeedId}
-										onSelectSpeed={handleSelectSpeed}
-										annotationRegions={annotationRegions}
-										onAnnotationAdded={handleAnnotationAdded}
-										onAnnotationSpanChange={handleAnnotationSpanChange}
-										onAnnotationDelete={handleAnnotationDelete}
-										selectedAnnotationId={selectedAnnotationId}
-										onSelectAnnotation={handleSelectAnnotation}
-										aspectRatio={aspectRatio}
-										onAspectRatioChange={(ar) => pushState({ aspectRatio: ar })}
-									/>
+								{/* Playback controls */}
+								<div className="w-full flex justify-center items-center h-12 flex-shrink-0 px-3 py-1.5 my-1.5">
+									<div className="w-full max-w-[700px]">
+										<PlaybackControls
+											isPlaying={isPlaying}
+											currentTime={currentTime}
+											duration={duration}
+											isFullscreen={isFullscreen}
+											onToggleFullscreen={toggleFullscreen}
+											onTogglePlayPause={togglePlayPause}
+											onSeek={handleSeek}
+										/>
+									</div>
 								</div>
-							</Panel>
-						</PanelGroup>
-					</Panel>
+							</div>
+						</Panel>
 
-					<PanelResizeHandle className="h-full bg-[#09090b]/80 hover:bg-[#09090b] transition-colors rounded-full flex items-center justify-center">
-						<div className="w-1 h-8 bg-white/20 rounded-full"></div>
-					</PanelResizeHandle>
+						<PanelResizeHandle className="bg-[#09090b]/80 hover:bg-[#09090b] transition-colors rounded-full flex items-center justify-center">
+							<div className="w-8 h-1 bg-white/20 rounded-full"></div>
+						</PanelResizeHandle>
 
-					{/* Right section: settings panel */}
-					<Panel defaultSize={30} minSize={25} maxSize={50}>
-						<SettingsPanel
-							selected={wallpaper}
-							onWallpaperChange={(w) => pushState({ wallpaper: w })}
-							selectedZoomDepth={
-								selectedZoomId ? zoomRegions.find((z) => z.id === selectedZoomId)?.depth : null
-							}
-							onZoomDepthChange={(depth) => selectedZoomId && handleZoomDepthChange(depth)}
-							selectedZoomId={selectedZoomId}
-							onZoomDelete={handleZoomDelete}
-							selectedTrimId={selectedTrimId}
-							onTrimDelete={handleTrimDelete}
-							shadowIntensity={shadowIntensity}
-							onShadowChange={(v) => updateState({ shadowIntensity: v })}
-							onShadowCommit={commitState}
-							showBlur={showBlur}
-							onBlurChange={(v) => pushState({ showBlur: v })}
-							motionBlurAmount={motionBlurAmount}
-							onMotionBlurChange={(v) => updateState({ motionBlurAmount: v })}
-							onMotionBlurCommit={commitState}
-							borderRadius={borderRadius}
-							onBorderRadiusChange={(v) => updateState({ borderRadius: v })}
-							onBorderRadiusCommit={commitState}
-							padding={padding}
-							onPaddingChange={(v) => updateState({ padding: v })}
-							onPaddingCommit={commitState}
-							cropRegion={cropRegion}
-							onCropChange={(r) => pushState({ cropRegion: r })}
-							aspectRatio={aspectRatio}
-							videoElement={videoPlaybackRef.current?.video || null}
-							exportQuality={exportQuality}
-							onExportQualityChange={setExportQuality}
-							exportFormat={exportFormat}
-							onExportFormatChange={setExportFormat}
-							gifFrameRate={gifFrameRate}
-							onGifFrameRateChange={setGifFrameRate}
-							gifLoop={gifLoop}
-							onGifLoopChange={setGifLoop}
-							gifSizePreset={gifSizePreset}
-							onGifSizePresetChange={setGifSizePreset}
-							gifOutputDimensions={calculateOutputDimensions(
-								videoPlaybackRef.current?.video?.videoWidth || 1920,
-								videoPlaybackRef.current?.video?.videoHeight || 1080,
-								gifSizePreset,
-								GIF_SIZE_PRESETS,
-							)}
-							onExport={handleOpenExportDialog}
-							selectedAnnotationId={selectedAnnotationId}
-							annotationRegions={annotationRegions}
-							onAnnotationContentChange={handleAnnotationContentChange}
-							onAnnotationTypeChange={handleAnnotationTypeChange}
-							onAnnotationStyleChange={handleAnnotationStyleChange}
-							onAnnotationFigureDataChange={handleAnnotationFigureDataChange}
-							onAnnotationDelete={handleAnnotationDelete}
-							onSaveProject={handleSaveProject}
-							onLoadProject={handleLoadProject}
-							selectedSpeedId={selectedSpeedId}
-							selectedSpeedValue={
-								selectedSpeedId
-									? (speedRegions.find((r) => r.id === selectedSpeedId)?.speed ?? null)
-									: null
-							}
-							onSpeedChange={handleSpeedChange}
-							onSpeedDelete={handleSpeedDelete}
-						/>
-					</Panel>
-				</PanelGroup>
+						{/* Timeline section */}
+						<Panel defaultSize={30} maxSize={60} minSize={30}>
+							<div className="h-full bg-[#09090b] rounded-2xl border border-white/5 shadow-lg overflow-hidden flex flex-col">
+								<TimelineEditor
+									videoDuration={duration}
+									currentTime={currentTime}
+									onSeek={handleSeek}
+									cursorTelemetry={cursorTelemetry}
+									zoomRegions={zoomRegions}
+									onZoomAdded={handleZoomAdded}
+									onZoomSuggested={handleZoomSuggested}
+									onZoomSpanChange={handleZoomSpanChange}
+									onZoomDelete={handleZoomDelete}
+									selectedZoomId={selectedZoomId}
+									onSelectZoom={handleSelectZoom}
+									trimRegions={trimRegions}
+									onTrimAdded={handleTrimAdded}
+									onTrimSpanChange={handleTrimSpanChange}
+									onTrimDelete={handleTrimDelete}
+									selectedTrimId={selectedTrimId}
+									onSelectTrim={handleSelectTrim}
+									speedRegions={speedRegions}
+									onSpeedAdded={handleSpeedAdded}
+									onSpeedSpanChange={handleSpeedSpanChange}
+									onSpeedDelete={handleSpeedDelete}
+									selectedSpeedId={selectedSpeedId}
+									onSelectSpeed={handleSelectSpeed}
+									annotationRegions={annotationRegions}
+									onAnnotationAdded={handleAnnotationAdded}
+									onAnnotationSpanChange={handleAnnotationSpanChange}
+									onAnnotationDelete={handleAnnotationDelete}
+									selectedAnnotationId={selectedAnnotationId}
+									onSelectAnnotation={handleSelectAnnotation}
+									aspectRatio={aspectRatio}
+									onAspectRatioChange={(ar) =>
+										pushState({
+											aspectRatio: ar,
+											webcamLayoutPreset:
+												!isPortraitAspectRatio(ar) && webcamLayoutPreset === "vertical-stack"
+													? "picture-in-picture"
+													: webcamLayoutPreset,
+										})
+									}
+								/>
+							</div>
+						</Panel>
+					</PanelGroup>
+				</div>
+
+				{/* Right section: settings panel */}
+				<div className="flex-[3] min-w-[280px] max-w-[420px] h-full">
+					<SettingsPanel
+						selected={wallpaper}
+						onWallpaperChange={(w) => pushState({ wallpaper: w })}
+						selectedZoomDepth={
+							selectedZoomId ? zoomRegions.find((z) => z.id === selectedZoomId)?.depth : null
+						}
+						onZoomDepthChange={(depth) => selectedZoomId && handleZoomDepthChange(depth)}
+						selectedZoomFocusMode={
+							selectedZoomId
+								? (zoomRegions.find((z) => z.id === selectedZoomId)?.focusMode ?? "manual")
+								: null
+						}
+						onZoomFocusModeChange={(mode) => selectedZoomId && handleZoomFocusModeChange(mode)}
+						hasCursorTelemetry={cursorTelemetry.length > 0}
+						selectedZoomId={selectedZoomId}
+						onZoomDelete={handleZoomDelete}
+						selectedTrimId={selectedTrimId}
+						onTrimDelete={handleTrimDelete}
+						shadowIntensity={shadowIntensity}
+						onShadowChange={(v) => updateState({ shadowIntensity: v })}
+						onShadowCommit={commitState}
+						showBlur={showBlur}
+						onBlurChange={(v) => pushState({ showBlur: v })}
+						motionBlurAmount={motionBlurAmount}
+						onMotionBlurChange={(v) => updateState({ motionBlurAmount: v })}
+						onMotionBlurCommit={commitState}
+						borderRadius={borderRadius}
+						onBorderRadiusChange={(v) => updateState({ borderRadius: v })}
+						onBorderRadiusCommit={commitState}
+						padding={padding}
+						onPaddingChange={(v) => updateState({ padding: v })}
+						onPaddingCommit={commitState}
+						cropRegion={cropRegion}
+						onCropChange={(r) => pushState({ cropRegion: r })}
+						aspectRatio={aspectRatio}
+						hasWebcam={Boolean(webcamVideoPath)}
+						webcamLayoutPreset={webcamLayoutPreset}
+						onWebcamLayoutPresetChange={(preset) =>
+							pushState({
+								webcamLayoutPreset: preset,
+								webcamPosition: preset === "vertical-stack" ? null : webcamPosition,
+							})
+						}
+						webcamMaskShape={webcamMaskShape}
+						onWebcamMaskShapeChange={(shape) => pushState({ webcamMaskShape: shape })}
+						videoElement={videoPlaybackRef.current?.video || null}
+						exportQuality={exportQuality}
+						onExportQualityChange={setExportQuality}
+						exportFormat={exportFormat}
+						onExportFormatChange={setExportFormat}
+						gifFrameRate={gifFrameRate}
+						onGifFrameRateChange={setGifFrameRate}
+						gifLoop={gifLoop}
+						onGifLoopChange={setGifLoop}
+						gifSizePreset={gifSizePreset}
+						onGifSizePresetChange={setGifSizePreset}
+						gifOutputDimensions={calculateOutputDimensions(
+							videoPlaybackRef.current?.video?.videoWidth || 1920,
+							videoPlaybackRef.current?.video?.videoHeight || 1080,
+							gifSizePreset,
+							GIF_SIZE_PRESETS,
+							aspectRatio === "native"
+								? getNativeAspectRatioValue(
+										videoPlaybackRef.current?.video?.videoWidth || 1920,
+										videoPlaybackRef.current?.video?.videoHeight || 1080,
+										cropRegion,
+									)
+								: getAspectRatioValue(aspectRatio),
+						)}
+						onExport={handleOpenExportDialog}
+						selectedAnnotationId={selectedAnnotationId}
+						annotationRegions={annotationRegions}
+						onAnnotationContentChange={handleAnnotationContentChange}
+						onAnnotationTypeChange={handleAnnotationTypeChange}
+						onAnnotationStyleChange={handleAnnotationStyleChange}
+						onAnnotationFigureDataChange={handleAnnotationFigureDataChange}
+						onAnnotationDelete={handleAnnotationDelete}
+						selectedSpeedId={selectedSpeedId}
+						selectedSpeedValue={
+							selectedSpeedId
+								? (speedRegions.find((r) => r.id === selectedSpeedId)?.speed ?? null)
+								: null
+						}
+						onSpeedChange={handleSpeedChange}
+						onSpeedDelete={handleSpeedDelete}
+						unsavedExport={unsavedExport}
+						onSaveUnsavedExport={handleSaveUnsavedExport}
+					/>
+				</div>
 			</div>
 
-			<Toaster theme="dark" className="pointer-events-auto" />
-
 			<ExportDialog
 				isOpen={showExportDialog}
 				onClose={() => setShowExportDialog(false)}

src/components/video-editor/VideoPlayback.tsx

@@ -19,7 +19,13 @@ import {
 	useState,
 } from "react";
 import { getAssetPath } from "@/lib/assetPath";
-import { computeWebcamOverlayLayout, type WebcamOverlayLayout } from "@/lib/webcamOverlay";
+import {
+	getWebcamLayoutCssBoxShadow,
+	type Size,
+	type StyledRenderRect,
+	type WebcamLayoutPreset,
+} from "@/lib/compositeLayout";
+import { getCssClipPath } from "@/lib/webcamMaskShapes";
 import {
 	type AspectRatio,
 	formatAspectRatioForCSS,
@@ -36,10 +42,14 @@ import {
 	type ZoomRegion,
 } from "./types";
 import {
+	AUTO_FOLLOW_RAMP_DISTANCE,
+	AUTO_FOLLOW_SMOOTHING_FACTOR,
+	AUTO_FOLLOW_SMOOTHING_FACTOR_MAX,
 	DEFAULT_FOCUS,
 	ZOOM_SCALE_DEADZONE,
 	ZOOM_TRANSLATION_DEADZONE_PX,
 } from "./videoPlayback/constants";
+import { adaptiveSmoothFactor, smoothCursorFocus } from "./videoPlayback/cursorFollowUtils";
 import { clampFocusToStage as clampFocusToStageUtil } from "./videoPlayback/focusUtils";
 import { layoutVideoContent as layoutVideoContentUtil } from "./videoPlayback/layoutUtils";
 import { clamp01 } from "./videoPlayback/mathUtils";
@@ -57,6 +67,11 @@ import {
 interface VideoPlaybackProps {
 	videoPath: string;
 	webcamVideoPath?: string;
+	webcamLayoutPreset: WebcamLayoutPreset;
+	webcamMaskShape?: import("./types").WebcamMaskShape;
+	webcamPosition?: { cx: number; cy: number } | null;
+	onWebcamPositionChange?: (position: { cx: number; cy: number }) => void;
+	onWebcamPositionDragEnd?: () => void;
 	onDurationChange: (duration: number) => void;
 	onTimeUpdate: (time: number) => void;
 	currentTime: number;
@@ -84,6 +99,7 @@ interface VideoPlaybackProps {
 	onSelectAnnotation?: (id: string | null) => void;
 	onAnnotationPositionChange?: (id: string, position: { x: number; y: number }) => void;
 	onAnnotationSizeChange?: (id: string, size: { width: number; height: number }) => void;
+	cursorTelemetry?: import("./types").CursorTelemetryPoint[];
 }
 
 export interface VideoPlaybackRef {
@@ -101,6 +117,11 @@ const VideoPlayback = forwardRef<VideoPlaybackRef, VideoPlaybackProps>(
 		{
 			videoPath,
 			webcamVideoPath,
+			webcamLayoutPreset,
+			webcamMaskShape,
+			webcamPosition,
+			onWebcamPositionChange,
+			onWebcamPositionDragEnd,
 			onDurationChange,
 			onTimeUpdate,
 			currentTime,
@@ -128,13 +149,13 @@ const VideoPlayback = forwardRef<VideoPlaybackRef, VideoPlaybackProps>(
 			onSelectAnnotation,
 			onAnnotationPositionChange,
 			onAnnotationSizeChange,
+			cursorTelemetry = [],
 		},
 		ref,
 	) => {
 		const videoRef = useRef<HTMLVideoElement | null>(null);
 		const webcamVideoRef = useRef<HTMLVideoElement | null>(null);
 		const containerRef = useRef<HTMLDivElement | null>(null);
-		const stageRef = useRef<HTMLDivElement | null>(null);
 		const appRef = useRef<Application | null>(null);
 		const videoSpriteRef = useRef<Sprite | null>(null);
 		const videoContainerRef = useRef<Container | null>(null);
@@ -144,13 +165,11 @@ const VideoPlayback = forwardRef<VideoPlaybackRef, VideoPlaybackProps>(
 		const [videoReady, setVideoReady] = useState(false);
 		const overlayRef = useRef<HTMLDivElement | null>(null);
 		const focusIndicatorRef = useRef<HTMLDivElement | null>(null);
-		const [webcamLayout, setWebcamLayout] = useState<WebcamOverlayLayout | null>(null);
-		const [webcamDimensions, setWebcamDimensions] = useState<{
-			width: number;
-			height: number;
-		} | null>(null);
+		const [webcamLayout, setWebcamLayout] = useState<StyledRenderRect | null>(null);
+		const [webcamDimensions, setWebcamDimensions] = useState<Size | null>(null);
 		const currentTimeRef = useRef(0);
 		const zoomRegionsRef = useRef<ZoomRegion[]>([]);
+		const cursorTelemetryRef = useRef<import("./types").CursorTelemetryPoint[]>([]);
 		const selectedZoomIdRef = useRef<string | null>(null);
 		const animationStateRef = useRef({
 			scale: 1,
@@ -164,6 +183,8 @@ const VideoPlayback = forwardRef<VideoPlaybackRef, VideoPlaybackProps>(
 		const blurFilterRef = useRef<BlurFilter | null>(null);
 		const motionBlurFilterRef = useRef<MotionBlurFilter | null>(null);
 		const isDraggingFocusRef = useRef(false);
+		const isDraggingWebcamRef = useRef(false);
+		const webcamDragOffsetRef = useRef({ dx: 0, dy: 0 });
 		const stageSizeRef = useRef({ width: 0, height: 0 });
 		const videoSizeRef = useRef({ width: 0, height: 0 });
 		const baseScaleRef = useRef(1);
@@ -183,6 +204,8 @@ const VideoPlayback = forwardRef<VideoPlaybackRef, VideoPlaybackProps>(
 		const onTimeUpdateRef = useRef(onTimeUpdate);
 		const onPlayStateChangeRef = useRef(onPlayStateChange);
 		const videoReadyRafRef = useRef<number | null>(null);
+		const smoothedAutoFocusRef = useRef<ZoomFocus | null>(null);
+		const prevTargetProgressRef = useRef(0);
 
 		const clampFocusToStage = useCallback((focus: ZoomFocus, depth: ZoomDepth) => {
 			return clampFocusToStageUtil(focus, depth, stageSizeRef.current);
@@ -258,6 +281,10 @@ const VideoPlayback = forwardRef<VideoPlaybackRef, VideoPlaybackProps>(
 				lockedVideoDimensions: lockedVideoDimensionsRef.current,
 				borderRadius,
 				padding,
+				webcamDimensions,
+				webcamLayoutPreset,
+				webcamPosition,
+				webcamMaskShape,
 			});
 
 			if (result) {
@@ -267,6 +294,7 @@ const VideoPlayback = forwardRef<VideoPlaybackRef, VideoPlaybackProps>(
 				baseOffsetRef.current = result.baseOffset;
 				baseMaskRef.current = result.maskRect;
 				cropBoundsRef.current = result.cropBounds;
+				setWebcamLayout(result.webcamRect);
 
 				// Reset camera container to identity
 				cameraContainer.scale.set(1);
@@ -279,7 +307,16 @@ const VideoPlayback = forwardRef<VideoPlaybackRef, VideoPlaybackProps>(
 
 				updateOverlayForRegion(activeRegion);
 			}
-		}, [updateOverlayForRegion, cropRegion, borderRadius, padding]);
+		}, [
+			updateOverlayForRegion,
+			cropRegion,
+			borderRadius,
+			padding,
+			webcamDimensions,
+			webcamLayoutPreset,
+			webcamPosition,
+			webcamMaskShape,
+		]);
 
 		useEffect(() => {
 			layoutVideoContentRef.current = layoutVideoContent;
@@ -356,6 +393,7 @@ const VideoPlayback = forwardRef<VideoPlaybackRef, VideoPlaybackProps>(
 			if (!regionId) return;
 			const region = zoomRegionsRef.current.find((r) => r.id === regionId);
 			if (!region) return;
+			if (region.focusMode === "auto") return;
 			onSelectZoom(region.id);
 			event.preventDefault();
 			isDraggingFocusRef.current = true;
@@ -388,10 +426,61 @@ const VideoPlayback = forwardRef<VideoPlaybackRef, VideoPlaybackProps>(
 			endFocusDrag(event);
 		};
 
+		// ── Webcam PiP drag handlers ──
+
+		const handleWebcamPointerDown = (event: React.PointerEvent<HTMLVideoElement>) => {
+			if (isPlayingRef.current) return;
+			if (webcamLayoutPreset !== "picture-in-picture") return;
+			event.preventDefault();
+			event.stopPropagation();
+			isDraggingWebcamRef.current = true;
+			event.currentTarget.setPointerCapture(event.pointerId);
+
+			const webcamEl = event.currentTarget;
+			const webcamRect = webcamEl.getBoundingClientRect();
+			webcamDragOffsetRef.current = {
+				dx: event.clientX - (webcamRect.left + webcamRect.width / 2),
+				dy: event.clientY - (webcamRect.top + webcamRect.height / 2),
+			};
+		};
+
+		const handleWebcamPointerMove = (event: React.PointerEvent<HTMLVideoElement>) => {
+			if (!isDraggingWebcamRef.current) return;
+			event.preventDefault();
+			event.stopPropagation();
+
+			const containerEl = containerRef.current;
+			if (!containerEl || !onWebcamPositionChange) return;
+
+			const containerRect = containerEl.getBoundingClientRect();
+			const cx = clamp01(
+				(event.clientX - webcamDragOffsetRef.current.dx - containerRect.left) / containerRect.width,
+			);
+			const cy = clamp01(
+				(event.clientY - webcamDragOffsetRef.current.dy - containerRect.top) / containerRect.height,
+			);
+			onWebcamPositionChange({ cx, cy });
+		};
+
+		const handleWebcamPointerUp = (event: React.PointerEvent<HTMLVideoElement>) => {
+			if (!isDraggingWebcamRef.current) return;
+			isDraggingWebcamRef.current = false;
+			try {
+				event.currentTarget.releasePointerCapture(event.pointerId);
+			} catch {
+				// Pointer may already be released.
+			}
+			onWebcamPositionDragEnd?.();
+		};
+
 		useEffect(() => {
 			zoomRegionsRef.current = zoomRegions;
 		}, [zoomRegions]);
 
+		useEffect(() => {
+			cursorTelemetryRef.current = cursorTelemetry;
+		}, [cursorTelemetry]);
+
 		useEffect(() => {
 			selectedZoomIdRef.current = selectedZoomId;
 		}, [selectedZoomId]);
@@ -760,10 +849,16 @@ const VideoPlayback = forwardRef<VideoPlaybackRef, VideoPlaybackProps>(
 			};
 
 			const ticker = () => {
+				const bm = baseMaskRef.current;
+				const ss = stageSizeRef.current;
+				const viewportRatio =
+					bm.width > 0 && bm.height > 0
+						? { widthRatio: ss.width / bm.width, heightRatio: ss.height / bm.height }
+						: undefined;
 				const { region, strength, blendedScale, transition } = findDominantRegion(
 					zoomRegionsRef.current,
 					currentTimeRef.current,
-					{ connectZooms: true },
+					{ connectZooms: true, cursorTelemetry: cursorTelemetryRef.current, viewportRatio },
 				);
 
 				const defaultFocus = DEFAULT_FOCUS;
@@ -784,6 +879,47 @@ const VideoPlayback = forwardRef<VideoPlaybackRef, VideoPlaybackProps>(
 					targetFocus = regionFocus;
 					targetProgress = strength;
 
+					// Apply adaptive smoothing for auto-follow mode
+					if (region.focusMode === "auto" && !transition) {
+						const raw = targetFocus;
+						const isZoomingIn =
+							targetProgress < 0.999 && targetProgress >= prevTargetProgressRef.current;
+						if (targetProgress >= 0.999) {
+							// Full zoom: adaptive smoothing — moves faster when far, decelerates when close
+							const prev = smoothedAutoFocusRef.current ?? raw;
+							const factor = adaptiveSmoothFactor(
+								raw,
+								prev,
+								AUTO_FOLLOW_SMOOTHING_FACTOR,
+								AUTO_FOLLOW_SMOOTHING_FACTOR_MAX,
+								AUTO_FOLLOW_RAMP_DISTANCE,
+							);
+							const smoothed = smoothCursorFocus(raw, prev, factor);
+							smoothedAutoFocusRef.current = smoothed;
+							targetFocus = smoothed;
+						} else if (isZoomingIn) {
+							// Zoom-in: track cursor directly so zoom always aims at current cursor
+							// position; keep ref in sync to avoid snap when full-zoom begins
+							smoothedAutoFocusRef.current = raw;
+						} else {
+							// Zoom-out: keep smoothing for continuity — avoids snap at zoom-out start
+							const prev = smoothedAutoFocusRef.current ?? raw;
+							const factor = adaptiveSmoothFactor(
+								raw,
+								prev,
+								AUTO_FOLLOW_SMOOTHING_FACTOR,
+								AUTO_FOLLOW_SMOOTHING_FACTOR_MAX,
+								AUTO_FOLLOW_RAMP_DISTANCE,
+							);
+							const smoothed = smoothCursorFocus(raw, prev, factor);
+							smoothedAutoFocusRef.current = smoothed;
+							targetFocus = smoothed;
+						}
+					} else if (region.focusMode !== "auto") {
+						smoothedAutoFocusRef.current = null;
+					}
+					prevTargetProgressRef.current = targetProgress;
+
 					// Handle connected zoom transitions (pan between adjacent zoom regions)
 					if (transition) {
 						const startTransform = computeZoomTransform({
@@ -910,6 +1046,10 @@ const VideoPlayback = forwardRef<VideoPlaybackRef, VideoPlaybackProps>(
 		};
 
 		const [resolvedWallpaper, setResolvedWallpaper] = useState<string | null>(null);
+		const webcamCssBoxShadow = useMemo(
+			() => getWebcamLayoutCssBoxShadow(webcamLayoutPreset),
+			[webcamLayoutPreset],
+		);
 
 		useEffect(() => {
 			const webcamVideo = webcamVideoRef.current;
@@ -934,34 +1074,6 @@ const VideoPlayback = forwardRef<VideoPlaybackRef, VideoPlaybackProps>(
 			};
 		}, [webcamVideoPath]);
 
-		useEffect(() => {
-			const stage = stageRef.current;
-			if (!stage || !webcamDimensions) {
-				setWebcamLayout(null);
-				return;
-			}
-
-			const updateLayout = () => {
-				const layout = computeWebcamOverlayLayout({
-					stageWidth: stage.clientWidth,
-					stageHeight: stage.clientHeight,
-					videoWidth: webcamDimensions.width,
-					videoHeight: webcamDimensions.height,
-				});
-				setWebcamLayout(layout);
-			};
-
-			updateLayout();
-
-			if (typeof ResizeObserver === "undefined") {
-				return;
-			}
-
-			const observer = new ResizeObserver(updateLayout);
-			observer.observe(stage);
-			return () => observer.disconnect();
-		}, [webcamDimensions]);
-
 		useEffect(() => {
 			const webcamVideo = webcamVideoRef.current;
 			if (!webcamVideo || !webcamVideoPath) {
@@ -1075,7 +1187,6 @@ const VideoPlayback = forwardRef<VideoPlaybackRef, VideoPlaybackProps>(
 
 		return (
 			<div
-				ref={stageRef}
 				className="relative rounded-sm overflow-hidden"
 				style={{
 					width: "100%",
@@ -1109,27 +1220,47 @@ const VideoPlayback = forwardRef<VideoPlaybackRef, VideoPlaybackProps>(
 								: "none",
 					}}
 				/>
-				{webcamVideoPath && (
-					<video
-						ref={webcamVideoRef}
-						src={webcamVideoPath}
-						className="absolute object-cover pointer-events-none"
-						style={{
-							left: webcamLayout?.x ?? 0,
-							top: webcamLayout?.y ?? 0,
-							width: webcamLayout?.width ?? 0,
-							height: webcamLayout?.height ?? 0,
-							borderRadius: webcamLayout?.borderRadius ?? 0,
-							boxShadow: "0 12px 36px rgba(0,0,0,0.35), 0 4px 12px rgba(0,0,0,0.22)",
-							zIndex: 20,
-							opacity: webcamLayout ? 1 : 0,
-							backgroundColor: "#000",
-						}}
-						muted
-						preload="metadata"
-						playsInline
-					/>
-				)}
+				{webcamVideoPath &&
+					(() => {
+						const clipPath = getCssClipPath(webcamLayout?.maskShape ?? "rectangle");
+						const useClipPath = !!clipPath;
+						return (
+							<div
+								className="absolute"
+								style={{
+									left: webcamLayout?.x ?? 0,
+									top: webcamLayout?.y ?? 0,
+									width: webcamLayout?.width ?? 0,
+									height: webcamLayout?.height ?? 0,
+									zIndex: 20,
+									opacity: webcamLayout ? 1 : 0,
+									filter:
+										useClipPath && webcamCssBoxShadow !== "none"
+											? `drop-shadow(${webcamCssBoxShadow})`
+											: undefined,
+								}}
+							>
+								<video
+									ref={webcamVideoRef}
+									src={webcamVideoPath}
+									className={`w-full h-full object-cover ${webcamLayoutPreset === "picture-in-picture" ? "cursor-grab active:cursor-grabbing" : "pointer-events-none"}`}
+									style={{
+										borderRadius: useClipPath ? 0 : (webcamLayout?.borderRadius ?? 0),
+										clipPath: clipPath ?? undefined,
+										boxShadow: useClipPath ? "none" : webcamCssBoxShadow,
+										backgroundColor: "#000",
+									}}
+									onPointerDown={handleWebcamPointerDown}
+									onPointerMove={handleWebcamPointerMove}
+									onPointerUp={handleWebcamPointerUp}
+									onPointerLeave={handleWebcamPointerUp}
+									muted
+									preload="metadata"
+									playsInline
+								/>
+							</div>
+						);
+					})()}
 				{/* Only render overlay after PIXI and video are fully initialized */}
 				{pixiReady && videoReady && (
 					<div

src/components/video-editor/projectPersistence.test.ts

@@ -1,6 +1,9 @@
 import { describe, expect, it } from "vitest";
 import {
 	createProjectData,
+	createProjectSnapshot,
+	hasProjectUnsavedChanges,
+	normalizeProjectEditor,
 	PROJECT_VERSION,
 	resolveProjectMedia,
 	validateProjectData,
@@ -39,6 +42,8 @@ describe("projectPersistence media compatibility", () => {
 				speedRegions: [],
 				annotationRegions: [],
 				aspectRatio: "16:9",
+				webcamLayoutPreset: "picture-in-picture",
+				webcamMaskShape: "circle",
 				exportQuality: "good",
 				exportFormat: "mp4",
 				gifFrameRate: 15,
@@ -54,4 +59,47 @@ describe("projectPersistence media compatibility", () => {
 		});
 		expect(validateProjectData(project)).toBe(true);
 	});
+
+	it("normalizes webcam mask shape values safely", () => {
+		expect(normalizeProjectEditor({ webcamMaskShape: "rounded" }).webcamMaskShape).toBe("rounded");
+		expect(
+			normalizeProjectEditor({ webcamMaskShape: "not-a-real-shape" as never }).webcamMaskShape,
+		).toBe("rectangle");
+	});
+});
+
+it("creates stable snapshots for identical project state", () => {
+	const media = {
+		screenVideoPath: "/tmp/screen.webm",
+		webcamVideoPath: "/tmp/webcam.webm",
+	};
+	const editor = normalizeProjectEditor({
+		wallpaper: "/wallpapers/wallpaper1.jpg",
+		shadowIntensity: 0,
+		showBlur: false,
+		motionBlurAmount: 0,
+		borderRadius: 0,
+		padding: 50,
+		cropRegion: { x: 0, y: 0, width: 1, height: 1 },
+		zoomRegions: [],
+		trimRegions: [],
+		speedRegions: [],
+		annotationRegions: [],
+		aspectRatio: "16:9",
+		webcamLayoutPreset: "picture-in-picture",
+		webcamMaskShape: "circle",
+		exportQuality: "good",
+		exportFormat: "mp4",
+		gifFrameRate: 15,
+		gifLoop: true,
+		gifSizePreset: "medium",
+	});
+
+	expect(createProjectSnapshot(media, editor)).toBe(createProjectSnapshot(media, editor));
+});
+
+it("detects unsaved changes from differing snapshots", () => {
+	expect(hasProjectUnsavedChanges(null, null)).toBe(false);
+	expect(hasProjectUnsavedChanges("same", "same")).toBe(false);
+	expect(hasProjectUnsavedChanges("current", "baseline")).toBe(true);
 });

src/components/video-editor/projectPersistence.ts

@@ -11,9 +11,15 @@ import {
 	DEFAULT_CROP_REGION,
 	DEFAULT_FIGURE_DATA,
 	DEFAULT_PLAYBACK_SPEED,
+	DEFAULT_WEBCAM_LAYOUT_PRESET,
+	DEFAULT_WEBCAM_MASK_SHAPE,
+	DEFAULT_WEBCAM_POSITION,
 	DEFAULT_ZOOM_DEPTH,
 	type SpeedRegion,
 	type TrimRegion,
+	type WebcamLayoutPreset,
+	type WebcamMaskShape,
+	type WebcamPosition,
 	type ZoomRegion,
 } from "./types";
 
@@ -39,6 +45,9 @@ export interface ProjectEditorState {
 	speedRegions: SpeedRegion[];
 	annotationRegions: AnnotationRegion[];
 	aspectRatio: AspectRatio;
+	webcamLayoutPreset: WebcamLayoutPreset;
+	webcamMaskShape: WebcamMaskShape;
+	webcamPosition: WebcamPosition | null;
 	exportQuality: ExportQuality;
 	exportFormat: ExportFormat;
 	gifFrameRate: GifFrameRate;
@@ -183,6 +192,7 @@ export function normalizeProjectEditor(editor: Partial<ProjectEditorState>): Pro
 							cx: clamp(isFiniteNumber(region.focus?.cx) ? region.focus.cx : 0.5, 0, 1),
 							cy: clamp(isFiniteNumber(region.focus?.cy) ? region.focus.cy : 0.5, 0, 1),
 						},
+						focusMode: region.focusMode === "auto" ? "auto" : "manual",
 					};
 				})
 		: [];
@@ -341,6 +351,28 @@ export function normalizeProjectEditor(editor: Partial<ProjectEditorState>): Pro
 		annotationRegions: normalizedAnnotationRegions,
 		aspectRatio:
 			editor.aspectRatio && validAspectRatios.has(editor.aspectRatio) ? editor.aspectRatio : "16:9",
+		webcamLayoutPreset:
+			editor.webcamLayoutPreset === "vertical-stack" ||
+			editor.webcamLayoutPreset === "picture-in-picture"
+				? editor.webcamLayoutPreset
+				: DEFAULT_WEBCAM_LAYOUT_PRESET,
+		webcamMaskShape:
+			editor.webcamMaskShape === "rectangle" ||
+			editor.webcamMaskShape === "circle" ||
+			editor.webcamMaskShape === "square" ||
+			editor.webcamMaskShape === "rounded"
+				? editor.webcamMaskShape
+				: DEFAULT_WEBCAM_MASK_SHAPE,
+		webcamPosition:
+			editor.webcamPosition &&
+			typeof editor.webcamPosition === "object" &&
+			isFiniteNumber((editor.webcamPosition as WebcamPosition).cx) &&
+			isFiniteNumber((editor.webcamPosition as WebcamPosition).cy)
+				? {
+						cx: clamp((editor.webcamPosition as WebcamPosition).cx, 0, 1),
+						cy: clamp((editor.webcamPosition as WebcamPosition).cy, 0, 1),
+					}
+				: DEFAULT_WEBCAM_POSITION,
 		exportQuality:
 			editor.exportQuality === "medium" || editor.exportQuality === "source"
 				? editor.exportQuality
@@ -373,3 +405,19 @@ export function createProjectData(
 		editor,
 	};
 }
+
+export function createProjectSnapshot(
+	media: ProjectMedia,
+	editor: Partial<ProjectEditorState>,
+): string {
+	return JSON.stringify(createProjectData(media, normalizeProjectEditor(editor)));
+}
+
+export function hasProjectUnsavedChanges(
+	currentSnapshot: string | null,
+	baselineSnapshot: string | null,
+): boolean {
+	return Boolean(
+		currentSnapshot !== null && baselineSnapshot !== null && currentSnapshot !== baselineSnapshot,
+	);
+}

src/components/video-editor/timeline/TimelineEditor.tsx

@@ -20,6 +20,7 @@ import {
 	DropdownMenuItem,
 	DropdownMenuTrigger,
 } from "@/components/ui/dropdown-menu";
+import { useScopedT } from "@/contexts/I18nContext";
 import { useShortcuts } from "@/contexts/ShortcutsContext";
 import { matchesShortcut } from "@/lib/shortcuts";
 import { cn } from "@/lib/utils";
@@ -169,6 +170,33 @@ function createInitialRange(totalMs: number): Range {
 	return { start: 0, end: FALLBACK_RANGE_MS };
 }
 
+function clampVisibleRange(candidate: Range, totalMs: number): Range {
+	if (totalMs <= 0) {
+		return candidate;
+	}
+
+	const span = Math.max(candidate.end - candidate.start, 1);
+
+	if (span >= totalMs) {
+		return { start: 0, end: totalMs };
+	}
+
+	const start = Math.max(0, Math.min(candidate.start, totalMs - span));
+	return { start, end: start + span };
+}
+
+function normalizeWheelDelta(delta: number, deltaMode: number, pageSizePx: number): number {
+	if (deltaMode === WheelEvent.DOM_DELTA_LINE) {
+		return delta * 16;
+	}
+
+	if (deltaMode === WheelEvent.DOM_DELTA_PAGE) {
+		return delta * pageSizePx;
+	}
+
+	return delta;
+}
+
 function formatTimeLabel(milliseconds: number, intervalMs: number) {
 	const totalSeconds = milliseconds / 1000;
 	const hours = Math.floor(totalSeconds / 3600);
@@ -204,18 +232,21 @@ function PlaybackCursor({
 	currentTimeMs,
 	videoDurationMs,
 	onSeek,
+	onRangeChange,
 	timelineRef,
 	keyframes = [],
 }: {
 	currentTimeMs: number;
 	videoDurationMs: number;
 	onSeek?: (time: number) => void;
+	onRangeChange?: (updater: (previous: Range) => Range) => void;
 	timelineRef: React.RefObject<HTMLDivElement>;
 	keyframes?: { id: string; time: number }[];
 }) {
 	const { sidebarWidth, direction, range, valueToPixels, pixelsToValue } = useTimelineContext();
 	const sideProperty = direction === "rtl" ? "right" : "left";
 	const [isDragging, setIsDragging] = useState(false);
+	const [dragPreviewTimeMs, setDragPreviewTimeMs] = useState<number | null>(null);
 
 	useEffect(() => {
 		if (!isDragging) return;
@@ -225,6 +256,7 @@ function PlaybackCursor({
 
 			const rect = timelineRef.current.getBoundingClientRect();
 			const clickX = e.clientX - rect.left - sidebarWidth;
+			const contentWidth = Math.max(rect.width - sidebarWidth, 1);
 
 			// Allow dragging outside to 0 or max, but clamp the value
 			const relativeMs = pixelsToValue(clickX);
@@ -243,11 +275,51 @@ function PlaybackCursor({
 				absoluteMs = nearbyKeyframe.time;
 			}
 
+			setDragPreviewTimeMs(absoluteMs);
+
+			const visibleMs = range.end - range.start;
+			if (onRangeChange && visibleMs > 0 && videoDurationMs > visibleMs) {
+				const msPerPixel = visibleMs / contentWidth;
+				const overflowLeftPx = Math.max(0, -clickX);
+				const overflowRightPx = Math.max(0, clickX - contentWidth);
+
+				if (overflowLeftPx > 0 && range.start > 0) {
+					const shiftMs = overflowLeftPx * msPerPixel;
+					onRangeChange((previous) => {
+						const nextRange = clampVisibleRange(
+							{
+								start: previous.start - shiftMs,
+								end: previous.end - shiftMs,
+							},
+							videoDurationMs,
+						);
+						return nextRange.start === previous.start && nextRange.end === previous.end
+							? previous
+							: nextRange;
+					});
+				} else if (overflowRightPx > 0 && range.end < videoDurationMs) {
+					const shiftMs = overflowRightPx * msPerPixel;
+					onRangeChange((previous) => {
+						const nextRange = clampVisibleRange(
+							{
+								start: previous.start + shiftMs,
+								end: previous.end + shiftMs,
+							},
+							videoDurationMs,
+						);
+						return nextRange.start === previous.start && nextRange.end === previous.end
+							? previous
+							: nextRange;
+					});
+				}
+			}
+
 			onSeek(absoluteMs / 1000);
 		};
 
 		const handleMouseUp = () => {
 			setIsDragging(false);
+			setDragPreviewTimeMs(null);
 			document.body.style.cursor = "";
 		};
 
@@ -263,6 +335,7 @@ function PlaybackCursor({
 	}, [
 		isDragging,
 		onSeek,
+		onRangeChange,
 		timelineRef,
 		sidebarWidth,
 		range.start,
@@ -272,11 +345,14 @@ function PlaybackCursor({
 		keyframes,
 	]);
 
-	if (videoDurationMs <= 0 || currentTimeMs < 0) {
+	const displayTimeMs =
+		isDragging && dragPreviewTimeMs !== null ? dragPreviewTimeMs : currentTimeMs;
+
+	if (videoDurationMs <= 0 || displayTimeMs < 0) {
 		return null;
 	}
 
-	const clampedTime = Math.min(currentTimeMs, videoDurationMs);
+	const clampedTime = Math.min(displayTimeMs, videoDurationMs);
 
 	if (clampedTime < range.start || clampedTime > range.end) {
 		return null;
@@ -299,6 +375,7 @@ function PlaybackCursor({
 				}}
 				onMouseDown={(e) => {
 					e.stopPropagation(); // Prevent timeline click
+					setDragPreviewTimeMs(currentTimeMs);
 					setIsDragging(true);
 				}}
 			>
@@ -444,6 +521,7 @@ function Timeline({
 	videoDurationMs,
 	currentTimeMs,
 	onSeek,
+	onRangeChange,
 	onSelectZoom,
 	onSelectTrim,
 	onSelectAnnotation,
@@ -458,6 +536,7 @@ function Timeline({
 	videoDurationMs: number;
 	currentTimeMs: number;
 	onSeek?: (time: number) => void;
+	onRangeChange?: (updater: (previous: Range) => Range) => void;
 	onSelectZoom?: (id: string | null) => void;
 	onSelectTrim?: (id: string | null) => void;
 	onSelectAnnotation?: (id: string | null) => void;
@@ -468,6 +547,7 @@ function Timeline({
 	selectedSpeedId?: string | null;
 	keyframes?: { id: string; time: number }[];
 }) {
+	const t = useScopedT("timeline");
 	const { setTimelineRef, style, sidebarWidth, range, pixelsToValue } = useTimelineContext();
 	const localTimelineRef = useRef<HTMLDivElement | null>(null);
 
@@ -514,6 +594,46 @@ function Timeline({
 		],
 	);
 
+	const handleTimelineWheel = useCallback(
+		(event: React.WheelEvent<HTMLDivElement>) => {
+			if (!onRangeChange || event.ctrlKey || event.metaKey || videoDurationMs <= 0) {
+				return;
+			}
+
+			const visibleMs = range.end - range.start;
+			if (visibleMs <= 0 || videoDurationMs <= visibleMs) {
+				return;
+			}
+
+			const dominantDelta =
+				Math.abs(event.deltaX) > Math.abs(event.deltaY) ? event.deltaX : event.deltaY;
+			if (dominantDelta === 0) {
+				return;
+			}
+
+			event.preventDefault();
+
+			const pageWidthPx = Math.max(event.currentTarget.clientWidth - sidebarWidth, 1);
+			const normalizedDeltaPx = normalizeWheelDelta(dominantDelta, event.deltaMode, pageWidthPx);
+			const shiftMs = pixelsToValue(normalizedDeltaPx);
+
+			onRangeChange((previous) => {
+				const nextRange = clampVisibleRange(
+					{
+						start: previous.start + shiftMs,
+						end: previous.end + shiftMs,
+					},
+					videoDurationMs,
+				);
+
+				return nextRange.start === previous.start && nextRange.end === previous.end
+					? previous
+					: nextRange;
+			});
+		},
+		[onRangeChange, videoDurationMs, range.end, range.start, sidebarWidth, pixelsToValue],
+	);
+
 	const zoomItems = items.filter((item) => item.rowId === ZOOM_ROW_ID);
 	const trimItems = items.filter((item) => item.rowId === TRIM_ROW_ID);
 	const annotationItems = items.filter((item) => item.rowId === ANNOTATION_ROW_ID);
@@ -525,6 +645,7 @@ function Timeline({
 			style={style}
 			className="select-none bg-[#09090b] min-h-[140px] relative cursor-pointer group"
 			onClick={handleTimelineClick}
+			onWheel={handleTimelineWheel}
 		>
 			<div className="absolute inset-0 bg-[linear-gradient(to_right,#ffffff03_1px,transparent_1px)] bg-[length:20px_100%] pointer-events-none" />
 			<TimelineAxis videoDurationMs={videoDurationMs} currentTimeMs={currentTimeMs} />
@@ -532,11 +653,12 @@ function Timeline({
 				currentTimeMs={currentTimeMs}
 				videoDurationMs={videoDurationMs}
 				onSeek={onSeek}
+				onRangeChange={onRangeChange}
 				timelineRef={localTimelineRef}
 				keyframes={keyframes}
 			/>
 
-			<Row id={ZOOM_ROW_ID} isEmpty={zoomItems.length === 0} hint="Press Z to add zoom">
+			<Row id={ZOOM_ROW_ID} isEmpty={zoomItems.length === 0} hint={t("hints.pressZoom")}>
 				{zoomItems.map((item) => (
 					<Item
 						id={item.id}
@@ -553,7 +675,7 @@ function Timeline({
 				))}
 			</Row>
 
-			<Row id={TRIM_ROW_ID} isEmpty={trimItems.length === 0} hint="Press T to add trim">
+			<Row id={TRIM_ROW_ID} isEmpty={trimItems.length === 0} hint={t("hints.pressTrim")}>
 				{trimItems.map((item) => (
 					<Item
 						id={item.id}
@@ -572,7 +694,7 @@ function Timeline({
 			<Row
 				id={ANNOTATION_ROW_ID}
 				isEmpty={annotationItems.length === 0}
-				hint="Press A to add annotation"
+				hint={t("hints.pressAnnotation")}
 			>
 				{annotationItems.map((item) => (
 					<Item
@@ -589,7 +711,7 @@ function Timeline({
 				))}
 			</Row>
 
-			<Row id={SPEED_ROW_ID} isEmpty={speedItems.length === 0} hint="Press S to add speed">
+			<Row id={SPEED_ROW_ID} isEmpty={speedItems.length === 0} hint={t("hints.pressSpeed")}>
 				{speedItems.map((item) => (
 					<Item
 						id={item.id}
@@ -642,6 +764,7 @@ export default function TimelineEditor({
 	aspectRatio,
 	onAspectRatioChange,
 }: TimelineEditorProps) {
+	const t = useScopedT("timeline");
 	const totalMs = useMemo(() => Math.max(0, Math.round(videoDuration * 1000)), [videoDuration]);
 	const currentTimeMs = useMemo(() => Math.round(currentTime * 1000), [currentTime]);
 	const timelineScale = useMemo(() => calculateTimelineScale(videoDuration), [videoDuration]);
@@ -657,17 +780,15 @@ export default function TimelineEditor({
 	const [keyframes, setKeyframes] = useState<{ id: string; time: number }[]>([]);
 	const [selectedKeyframeId, setSelectedKeyframeId] = useState<string | null>(null);
 	const [scrollLabels, setScrollLabels] = useState({
-		pan: "Shift + Ctrl + Scroll",
+		pan: "Scroll",
 		zoom: "Ctrl + Scroll",
 	});
 	const timelineContainerRef = useRef<HTMLDivElement>(null);
 	const { shortcuts: keyShortcuts, isMac } = useShortcuts();
 
 	useEffect(() => {
-		formatShortcut(["shift", "mod", "Scroll"]).then((pan) => {
-			formatShortcut(["mod", "Scroll"]).then((zoom) => {
-				setScrollLabels({ pan, zoom });
-			});
+		formatShortcut(["mod", "Scroll"]).then((zoom) => {
+			setScrollLabels({ pan: "Scroll", zoom });
 		});
 	}, []);
 
@@ -848,15 +969,15 @@ export default function TimelineEditor({
 			(region) => startPos >= region.startMs && startPos < region.endMs,
 		);
 		if (isOverlapping || gapToNext <= 0) {
-			toast.error("Cannot place zoom here", {
-				description: "Zoom already exists at this location or not enough space available.",
+			toast.error(t("errors.cannotPlaceZoom"), {
+				description: t("errors.zoomExistsAtLocation"),
 			});
 			return;
 		}
 
 		const actualDuration = Math.min(defaultRegionDurationMs, gapToNext);
 		onZoomAdded({ start: startPos, end: startPos + actualDuration });
-	}, [videoDuration, totalMs, currentTimeMs, zoomRegions, onZoomAdded, defaultRegionDurationMs]);
+	}, [videoDuration, totalMs, currentTimeMs, zoomRegions, onZoomAdded, defaultRegionDurationMs, t]);
 
 	const handleSuggestZooms = useCallback(() => {
 		if (!videoDuration || videoDuration === 0 || totalMs === 0) {
@@ -864,13 +985,13 @@ export default function TimelineEditor({
 		}
 
 		if (!onZoomSuggested) {
-			toast.error("Zoom suggestion handler unavailable");
+			toast.error(t("errors.zoomSuggestionUnavailable"));
 			return;
 		}
 
 		if (cursorTelemetry.length < 2) {
-			toast.info("No cursor telemetry available", {
-				description: "Record a screencast first to generate cursor-based suggestions.",
+			toast.info(t("errors.noCursorTelemetry"), {
+				description: t("errors.noCursorTelemetryDescription"),
 			});
 			return;
 		}
@@ -887,8 +1008,8 @@ export default function TimelineEditor({
 		const normalizedSamples = normalizeCursorTelemetry(cursorTelemetry, totalMs);
 
 		if (normalizedSamples.length < 2) {
-			toast.info("No usable cursor telemetry", {
-				description: "The recording does not include enough cursor movement data.",
+			toast.info(t("errors.noUsableTelemetry"), {
+				description: t("errors.noUsableTelemetryDescription"),
 			});
 			return;
 		}
@@ -896,8 +1017,8 @@ export default function TimelineEditor({
 		const dwellCandidates = detectZoomDwellCandidates(normalizedSamples);
 
 		if (dwellCandidates.length === 0) {
-			toast.info("No clear cursor dwell moments found", {
-				description: "Try a recording with slower cursor pauses on important actions.",
+			toast.info(t("errors.noDwellMoments"), {
+				description: t("errors.noDwellMomentsDescription"),
 			});
 			return;
 		}
@@ -934,13 +1055,17 @@ export default function TimelineEditor({
 		});
 
 		if (addedCount === 0) {
-			toast.info("No auto-zoom slots available", {
-				description: "Detected dwell points overlap existing zoom regions.",
+			toast.info(t("errors.noAutoZoomSlots"), {
+				description: t("errors.noAutoZoomSlotsDescription"),
 			});
 			return;
 		}
 
-		toast.success(`Added ${addedCount} cursor-based zoom suggestion${addedCount === 1 ? "" : "s"}`);
+		toast.success(
+			addedCount === 1
+				? t("success.addedZoomSuggestions", { count: String(addedCount) })
+				: t("success.addedZoomSuggestionsPlural", { count: String(addedCount) }),
+		);
 	}, [
 		videoDuration,
 		totalMs,
@@ -948,6 +1073,7 @@ export default function TimelineEditor({
 		zoomRegions,
 		onZoomSuggested,
 		cursorTelemetry,
+		t,
 	]);
 
 	const handleAddTrim = useCallback(() => {
@@ -972,15 +1098,15 @@ export default function TimelineEditor({
 			(region) => startPos >= region.startMs && startPos < region.endMs,
 		);
 		if (isOverlapping || gapToNext <= 0) {
-			toast.error("Cannot place trim here", {
-				description: "Trim already exists at this location or not enough space available.",
+			toast.error(t("errors.cannotPlaceTrim"), {
+				description: t("errors.trimExistsAtLocation"),
 			});
 			return;
 		}
 
 		const actualDuration = Math.min(defaultRegionDurationMs, gapToNext);
 		onTrimAdded({ start: startPos, end: startPos + actualDuration });
-	}, [videoDuration, totalMs, currentTimeMs, trimRegions, onTrimAdded, defaultRegionDurationMs]);
+	}, [videoDuration, totalMs, currentTimeMs, trimRegions, onTrimAdded, defaultRegionDurationMs, t]);
 
 	const handleAddSpeed = useCallback(() => {
 		if (!videoDuration || videoDuration === 0 || totalMs === 0 || !onSpeedAdded) {
@@ -1004,15 +1130,23 @@ export default function TimelineEditor({
 			(region) => startPos >= region.startMs && startPos < region.endMs,
 		);
 		if (isOverlapping || gapToNext <= 0) {
-			toast.error("Cannot place speed here", {
-				description: "Speed region already exists at this location or not enough space available.",
+			toast.error(t("errors.cannotPlaceSpeed"), {
+				description: t("errors.speedExistsAtLocation"),
 			});
 			return;
 		}
 
 		const actualDuration = Math.min(defaultRegionDurationMs, gapToNext);
 		onSpeedAdded({ start: startPos, end: startPos + actualDuration });
-	}, [videoDuration, totalMs, currentTimeMs, speedRegions, onSpeedAdded, defaultRegionDurationMs]);
+	}, [
+		videoDuration,
+		totalMs,
+		currentTimeMs,
+		speedRegions,
+		onSpeedAdded,
+		defaultRegionDurationMs,
+		t,
+	]);
 
 	const handleAddAnnotation = useCallback(() => {
 		if (!videoDuration || videoDuration === 0 || totalMs === 0 || !onAnnotationAdded) {
@@ -1135,7 +1269,7 @@ export default function TimelineEditor({
 			id: region.id,
 			rowId: ZOOM_ROW_ID,
 			span: { start: region.startMs, end: region.endMs },
-			label: `Zoom ${index + 1}`,
+			label: t("labels.zoomItem", { index: String(index + 1) }),
 			zoomDepth: region.depth,
 			variant: "zoom",
 		}));
@@ -1144,7 +1278,7 @@ export default function TimelineEditor({
 			id: region.id,
 			rowId: TRIM_ROW_ID,
 			span: { start: region.startMs, end: region.endMs },
-			label: `Trim ${index + 1}`,
+			label: t("labels.trimItem", { index: String(index + 1) }),
 			variant: "trim",
 		}));
 
@@ -1153,12 +1287,12 @@ export default function TimelineEditor({
 
 			if (region.type === "text") {
 				// Show text preview
-				const preview = region.content.trim() || "Empty text";
+				const preview = region.content.trim() || t("labels.emptyText");
 				label = preview.length > 20 ? `${preview.substring(0, 20)}...` : preview;
 			} else if (region.type === "image") {
-				label = "Image";
+				label = t("labels.imageItem");
 			} else {
-				label = "Annotation";
+				label = t("labels.annotationItem");
 			}
 
 			return {
@@ -1174,13 +1308,13 @@ export default function TimelineEditor({
 			id: region.id,
 			rowId: SPEED_ROW_ID,
 			span: { start: region.startMs, end: region.endMs },
-			label: `Speed ${index + 1}`,
+			label: t("labels.speedItem", { index: String(index + 1) }),
 			speedValue: region.speed,
 			variant: "speed",
 		}));
 
 		return [...zooms, ...trims, ...annotations, ...speeds];
-	}, [zoomRegions, trimRegions, annotationRegions, speedRegions]);
+	}, [zoomRegions, trimRegions, annotationRegions, speedRegions, t]);
 
 	// Flat list of all non-annotation region spans for neighbour-clamping during drag/resize
 	const allRegionSpans = useMemo(() => {
@@ -1222,8 +1356,8 @@ export default function TimelineEditor({
 					<Plus className="w-6 h-6 text-slate-600" />
 				</div>
 				<div className="text-center">
-					<p className="text-sm font-medium text-slate-300">No Video Loaded</p>
-					<p className="text-xs text-slate-500 mt-1">Drag and drop a video to start editing</p>
+					<p className="text-sm font-medium text-slate-300">{t("emptyState.noVideo")}</p>
+					<p className="text-xs text-slate-500 mt-1">{t("emptyState.dragAndDrop")}</p>
 				</div>
 			</div>
 		);
@@ -1238,7 +1372,7 @@ export default function TimelineEditor({
 						variant="ghost"
 						size="icon"
 						className="h-7 w-7 text-slate-400 hover:text-[#34B27B] hover:bg-[#34B27B]/10 transition-all"
-						title="Add Zoom (Z)"
+						title={t("buttons.addZoom")}
 					>
 						<ZoomIn className="w-4 h-4" />
 					</Button>
@@ -1247,7 +1381,7 @@ export default function TimelineEditor({
 						variant="ghost"
 						size="icon"
 						className="h-7 w-7 text-slate-400 hover:text-[#34B27B] hover:bg-[#34B27B]/10 transition-all"
-						title="Suggest Zooms from Cursor"
+						title={t("buttons.suggestZooms")}
 					>
 						<WandSparkles className="w-4 h-4" />
 					</Button>
@@ -1256,7 +1390,7 @@ export default function TimelineEditor({
 						variant="ghost"
 						size="icon"
 						className="h-7 w-7 text-slate-400 hover:text-[#ef4444] hover:bg-[#ef4444]/10 transition-all"
-						title="Add Trim (T)"
+						title={t("buttons.addTrim")}
 					>
 						<Scissors className="w-4 h-4" />
 					</Button>
@@ -1265,7 +1399,7 @@ export default function TimelineEditor({
 						variant="ghost"
 						size="icon"
 						className="h-7 w-7 text-slate-400 hover:text-[#B4A046] hover:bg-[#B4A046]/10 transition-all"
-						title="Add Annotation (A)"
+						title={t("buttons.addAnnotation")}
 					>
 						<MessageSquare className="w-4 h-4" />
 					</Button>
@@ -1274,7 +1408,7 @@ export default function TimelineEditor({
 						variant="ghost"
 						size="icon"
 						className="h-7 w-7 text-slate-400 hover:text-[#d97706] hover:bg-[#d97706]/10 transition-all"
-						title="Add Speed (S)"
+						title={t("buttons.addSpeed")}
 					>
 						<Gauge className="w-4 h-4" />
 					</Button>
@@ -1313,13 +1447,13 @@ export default function TimelineEditor({
 						<kbd className="px-1.5 py-0.5 bg-white/5 border border-white/10 rounded text-[#34B27B] font-sans">
 							{scrollLabels.pan}
 						</kbd>
-						<span>Pan</span>
+						<span>{t("labels.pan")}</span>
 					</span>
 					<span className="flex items-center gap-1.5">
 						<kbd className="px-1.5 py-0.5 bg-white/5 border border-white/10 rounded text-[#34B27B] font-sans">
 							{scrollLabels.zoom}
 						</kbd>
-						<span>Zoom</span>
+						<span>{t("labels.zoom")}</span>
 					</span>
 				</div>
 			</div>
@@ -1351,6 +1485,7 @@ export default function TimelineEditor({
 						videoDurationMs={totalMs}
 						currentTimeMs={currentTimeMs}
 						onSeek={onSeek}
+						onRangeChange={setRange}
 						onSelectZoom={onSelectZoom}
 						onSelectTrim={onSelectTrim}
 						onSelectAnnotation={onSelectAnnotation}

src/components/video-editor/types.ts

@@ -1,4 +1,21 @@
+import type { WebcamLayoutPreset } from "@/lib/compositeLayout";
+
 export type ZoomDepth = 1 | 2 | 3 | 4 | 5 | 6;
+export type ZoomFocusMode = "manual" | "auto";
+export type { WebcamLayoutPreset };
+
+export const DEFAULT_WEBCAM_LAYOUT_PRESET: WebcamLayoutPreset = "picture-in-picture";
+
+export type WebcamMaskShape = "rectangle" | "circle" | "square" | "rounded";
+
+export const DEFAULT_WEBCAM_MASK_SHAPE: WebcamMaskShape = "rectangle";
+
+export interface WebcamPosition {
+	cx: number; // normalized horizontal center (0-1)
+	cy: number; // normalized vertical center (0-1)
+}
+
+export const DEFAULT_WEBCAM_POSITION: WebcamPosition | null = null;
 
 export interface ZoomFocus {
 	cx: number; // normalized horizontal center (0-1)
@@ -11,6 +28,7 @@ export interface ZoomRegion {
 	endMs: number;
 	depth: ZoomDepth;
 	focus: ZoomFocus;
+	focusMode?: ZoomFocusMode;
 }
 
 export interface CursorTelemetryPoint {

src/components/video-editor/videoPlayback/constants.ts

@@ -8,3 +8,6 @@ export const VIEWPORT_SCALE = 0.8;
 export const SMOOTHING_FACTOR = 0.12;
 export const ZOOM_TRANSLATION_DEADZONE_PX = 1.25;
 export const ZOOM_SCALE_DEADZONE = 0.002;
+export const AUTO_FOLLOW_SMOOTHING_FACTOR = 0.1;
+export const AUTO_FOLLOW_SMOOTHING_FACTOR_MAX = 0.25;
+export const AUTO_FOLLOW_RAMP_DISTANCE = 0.15;

src/components/video-editor/videoPlayback/cursorFollowUtils.ts

@@ -0,0 +1,73 @@
+import type { CursorTelemetryPoint, ZoomFocus } from "../types";
+
+/**
+ * Binary-search the sorted telemetry array and linearly interpolate
+ * the cursor position at the given playback time.
+ */
+export function interpolateCursorAt(
+	telemetry: CursorTelemetryPoint[],
+	timeMs: number,
+): ZoomFocus | null {
+	if (telemetry.length === 0) return null;
+
+	if (timeMs <= telemetry[0].timeMs) {
+		return { cx: telemetry[0].cx, cy: telemetry[0].cy };
+	}
+
+	const last = telemetry[telemetry.length - 1];
+	if (timeMs >= last.timeMs) {
+		return { cx: last.cx, cy: last.cy };
+	}
+
+	let lo = 0;
+	let hi = telemetry.length - 1;
+
+	while (lo < hi - 1) {
+		const mid = (lo + hi) >>> 1;
+		if (telemetry[mid].timeMs <= timeMs) {
+			lo = mid;
+		} else {
+			hi = mid;
+		}
+	}
+
+	const before = telemetry[lo];
+	const after = telemetry[hi];
+	const span = after.timeMs - before.timeMs;
+	const t = span > 0 ? (timeMs - before.timeMs) / span : 0;
+
+	return {
+		cx: before.cx + (after.cx - before.cx) * t,
+		cy: before.cy + (after.cy - before.cy) * t,
+	};
+}
+
+/**
+ * Exponential smoothing to reduce jitter from high-frequency cursor data.
+ * Lower factor = smoother / more lag, higher = more responsive.
+ */
+export function smoothCursorFocus(raw: ZoomFocus, prev: ZoomFocus, factor: number): ZoomFocus {
+	return {
+		cx: prev.cx + (raw.cx - prev.cx) * factor,
+		cy: prev.cy + (raw.cy - prev.cy) * factor,
+	};
+}
+
+/**
+ * Compute an adaptive smoothing factor that scales with distance:
+ * far from target → faster (maxFactor), close → slower (minFactor).
+ * This replaces the hard deadzone with a natural deceleration curve.
+ */
+export function adaptiveSmoothFactor(
+	raw: ZoomFocus,
+	prev: ZoomFocus,
+	minFactor: number,
+	maxFactor: number,
+	rampDistance: number,
+): number {
+	const dx = raw.cx - prev.cx;
+	const dy = raw.cy - prev.cy;
+	const distance = Math.sqrt(dx * dx + dy * dy);
+	const t = Math.min(1, distance / rampDistance);
+	return minFactor + (maxFactor - minFactor) * t;
+}

src/components/video-editor/videoPlayback/focusUtils.ts

@@ -39,9 +39,16 @@ function getFocusBounds(depth: ZoomDepth) {
 	return getFocusBoundsForScale(zoomScale);
 }
 
-function getFocusBoundsForScale(zoomScale: number) {
-	const marginX = 1 / (2 * zoomScale);
-	const marginY = 1 / (2 * zoomScale);
+interface ViewportRatio {
+	widthRatio: number;
+	heightRatio: number;
+}
+
+function getFocusBoundsForScale(zoomScale: number, viewportRatio?: ViewportRatio) {
+	const wr = viewportRatio?.widthRatio ?? 1;
+	const hr = viewportRatio?.heightRatio ?? 1;
+	const marginX = Math.min(0.5, wr / (2 * zoomScale));
+	const marginY = Math.min(0.5, hr / (2 * zoomScale));
 
 	return {
 		minX: marginX,
@@ -65,12 +72,16 @@ export function clampFocusToStage(
 	};
 }
 
-export function clampFocusToScale(focus: ZoomFocus, zoomScale: number): ZoomFocus {
+export function clampFocusToScale(
+	focus: ZoomFocus,
+	zoomScale: number,
+	viewportRatio?: ViewportRatio,
+): ZoomFocus {
 	const baseFocus = {
 		cx: clamp(focus.cx, 0, 1),
 		cy: clamp(focus.cy, 0, 1),
 	};
-	const bounds = getFocusBoundsForScale(zoomScale);
+	const bounds = getFocusBoundsForScale(zoomScale, viewportRatio);
 
 	return {
 		cx: clamp(baseFocus.cx, bounds.minX, bounds.maxX),
@@ -78,12 +89,16 @@ export function clampFocusToScale(focus: ZoomFocus, zoomScale: number): ZoomFocu
 	};
 }
 
-export function softenFocusToScale(focus: ZoomFocus, zoomScale: number): ZoomFocus {
+export function softenFocusToScale(
+	focus: ZoomFocus,
+	zoomScale: number,
+	viewportRatio?: ViewportRatio,
+): ZoomFocus {
 	const baseFocus = {
 		cx: clamp(focus.cx, 0, 1),
 		cy: clamp(focus.cy, 0, 1),
 	};
-	const bounds = getFocusBoundsForScale(zoomScale);
+	const bounds = getFocusBoundsForScale(zoomScale, viewportRatio);
 	const horizontalRange = bounds.maxX - bounds.minX;
 	const verticalRange = bounds.maxY - bounds.minY;
 	const horizontalSoftness = Math.min(0.12, horizontalRange * 0.35);

src/components/video-editor/videoPlayback/layoutUtils.ts

@@ -1,5 +1,12 @@
 import { Application, Graphics, Sprite } from "pixi.js";
-import type { CropRegion } from "../types";
+import {
+	computeCompositeLayout,
+	type RenderRect,
+	type Size,
+	type StyledRenderRect,
+	type WebcamLayoutPreset,
+} from "@/lib/compositeLayout";
+import type { CropRegion, WebcamMaskShape } from "../types";
 
 interface LayoutParams {
 	container: HTMLDivElement;
@@ -11,6 +18,10 @@ interface LayoutParams {
 	lockedVideoDimensions?: { width: number; height: number } | null;
 	borderRadius?: number;
 	padding?: number;
+	webcamDimensions?: Size | null;
+	webcamLayoutPreset?: WebcamLayoutPreset;
+	webcamPosition?: { cx: number; cy: number } | null;
+	webcamMaskShape?: WebcamMaskShape;
 }
 
 interface LayoutResult {
@@ -18,7 +29,8 @@ interface LayoutResult {
 	videoSize: { width: number; height: number };
 	baseScale: number;
 	baseOffset: { x: number; y: number };
-	maskRect: { x: number; y: number; width: number; height: number };
+	maskRect: RenderRect;
+	webcamRect: StyledRenderRect | null;
 	cropBounds: { startX: number; endX: number; startY: number; endY: number };
 }
 
@@ -33,6 +45,10 @@ export function layoutVideoContent(params: LayoutParams): LayoutResult | null {
 		lockedVideoDimensions,
 		borderRadius = 0,
 		padding = 0,
+		webcamDimensions,
+		webcamLayoutPreset,
+		webcamPosition,
+		webcamMaskShape,
 	} = params;
 
 	const videoWidth = lockedVideoDimensions?.width || videoElement.videoWidth;
@@ -67,15 +83,35 @@ export function layoutVideoContent(params: LayoutParams): LayoutResult | null {
 
 	// Calculate scale to fit the cropped area in the viewport
 	// Padding is a percentage (0-100), where 50 matches the original VIEWPORT_SCALE of 0.8
-	const paddingScale = 1.0 - (padding / 100) * 0.4;
+	// Vertical stack ignores padding — it's full-bleed
+	const effectivePadding = webcamLayoutPreset === "vertical-stack" ? 0 : padding;
+	const paddingScale = 1.0 - (effectivePadding / 100) * 0.4;
 	const maxDisplayWidth = width * paddingScale;
 	const maxDisplayHeight = height * paddingScale;
 
-	const scale = Math.min(
-		maxDisplayWidth / croppedVideoWidth,
-		maxDisplayHeight / croppedVideoHeight,
-		1,
-	);
+	const compositeLayout = computeCompositeLayout({
+		canvasSize: { width, height },
+		maxContentSize: { width: maxDisplayWidth, height: maxDisplayHeight },
+		screenSize: { width: croppedVideoWidth, height: croppedVideoHeight },
+		webcamSize: webcamDimensions,
+		layoutPreset: webcamLayoutPreset,
+		webcamPosition,
+		webcamMaskShape,
+	});
+
+	if (!compositeLayout) {
+		return null;
+	}
+
+	const screenRect = compositeLayout.screenRect;
+
+	// Cover mode: scale to fill the rect (may crop), otherwise fit-to-width
+	let scale: number;
+	if (compositeLayout.screenCover) {
+		scale = Math.max(screenRect.width / croppedVideoWidth, screenRect.height / croppedVideoHeight);
+	} else {
+		scale = screenRect.width / croppedVideoWidth;
+	}
 
 	videoSprite.scale.set(scale);
 
@@ -83,31 +119,25 @@ export function layoutVideoContent(params: LayoutParams): LayoutResult | null {
 	const fullVideoDisplayWidth = videoWidth * scale;
 	const fullVideoDisplayHeight = videoHeight * scale;
 
-	// Calculate display size of just the cropped region
+	// Position the video so the cropped region is centered within the screenRect
 	const croppedDisplayWidth = croppedVideoWidth * scale;
 	const croppedDisplayHeight = croppedVideoHeight * scale;
-
-	// Center the cropped region in the container
-	const centerOffsetX = (width - croppedDisplayWidth) / 2;
-	const centerOffsetY = (height - croppedDisplayHeight) / 2;
-
-	// Position the full video sprite so that when we apply the mask,
-	// the cropped region appears centered
-	// The crop starts at (crop.x * videoWidth, crop.y * videoHeight) in video coordinates
-	// In display coordinates, that's (crop.x * fullVideoDisplayWidth, crop.y * fullVideoDisplayHeight)
-	// We want that point to be at centerOffsetX, centerOffsetY
-	const spriteX = centerOffsetX - crop.x * fullVideoDisplayWidth;
-	const spriteY = centerOffsetY - crop.y * fullVideoDisplayHeight;
+	const offsetX = screenRect.x + (screenRect.width - croppedDisplayWidth) / 2;
+	const offsetY = screenRect.y + (screenRect.height - croppedDisplayHeight) / 2;
+	const spriteX = offsetX - crop.x * fullVideoDisplayWidth;
+	const spriteY = offsetY - crop.y * fullVideoDisplayHeight;
 
 	videoSprite.position.set(spriteX, spriteY);
 
-	// Create a mask that only shows the cropped region (centered in container)
-	const maskX = centerOffsetX;
-	const maskY = centerOffsetY;
-
-	// Apply border radius
+	// Apply border radius — mask clips the video to the screenRect
 	maskGraphics.clear();
-	maskGraphics.roundRect(maskX, maskY, croppedDisplayWidth, croppedDisplayHeight, borderRadius);
+	maskGraphics.roundRect(
+		screenRect.x,
+		screenRect.y,
+		screenRect.width,
+		screenRect.height,
+		compositeLayout.screenCover ? 0 : borderRadius,
+	);
 	maskGraphics.fill({ color: 0xffffff });
 
 	return {
@@ -115,7 +145,8 @@ export function layoutVideoContent(params: LayoutParams): LayoutResult | null {
 		videoSize: { width: croppedVideoWidth, height: croppedVideoHeight },
 		baseScale: scale,
 		baseOffset: { x: spriteX, y: spriteY },
-		maskRect: { x: maskX, y: maskY, width: croppedDisplayWidth, height: croppedDisplayHeight },
+		maskRect: compositeLayout.screenRect,
+		webcamRect: compositeLayout.webcamRect,
 		cropBounds: { startX: cropStartX, endX: cropEndX, startY: cropStartY, endY: cropEndY },
 	};
 }

src/components/video-editor/videoPlayback/overlayUtils.ts

@@ -14,7 +14,7 @@ interface OverlayUpdateParams {
 export function updateOverlayIndicator(params: OverlayUpdateParams) {
 	const { overlayEl, indicatorEl, region, focusOverride, videoSize, baseScale, isPlaying } = params;
 
-	if (!region) {
+	if (!region || region.focusMode === "auto") {
 		indicatorEl.style.display = "none";
 		overlayEl.style.pointerEvents = "none";
 		return;

src/components/video-editor/videoPlayback/zoomRegionUtils.ts

@@ -1,6 +1,7 @@
-import type { ZoomFocus, ZoomRegion } from "../types";
+import type { CursorTelemetryPoint, ZoomFocus, ZoomRegion } from "../types";
 import { ZOOM_DEPTH_SCALES } from "../types";
 import { TRANSITION_WINDOW_MS, ZOOM_IN_TRANSITION_WINDOW_MS } from "./constants";
+import { interpolateCursorAt } from "./cursorFollowUtils";
 import { clampFocusToScale } from "./focusUtils";
 import { clamp01, cubicBezier, easeOutScreenStudio } from "./mathUtils";
 
@@ -10,6 +11,8 @@ const ZOOM_IN_OVERLAP_MS = 500;
 
 type DominantRegionOptions = {
 	connectZooms?: boolean;
+	cursorTelemetry?: CursorTelemetryPoint[];
+	viewportRatio?: ViewportRatio;
 };
 
 type ConnectedRegionPair = {
@@ -64,8 +67,33 @@ function getLinearFocus(start: ZoomFocus, end: ZoomFocus, amount: number): ZoomF
 	};
 }
 
-function getResolvedFocus(region: ZoomRegion, zoomScale: number): ZoomFocus {
-	return clampFocusToScale(region.focus, zoomScale);
+interface ViewportRatio {
+	widthRatio: number;
+	heightRatio: number;
+}
+
+function getResolvedFocus(
+	region: ZoomRegion,
+	zoomScale: number,
+	timeMs?: number,
+	cursorTelemetry?: CursorTelemetryPoint[],
+	viewportRatio?: ViewportRatio,
+): ZoomFocus {
+	let focus = region.focus;
+
+	if (
+		region.focusMode === "auto" &&
+		cursorTelemetry &&
+		cursorTelemetry.length > 0 &&
+		timeMs !== undefined
+	) {
+		const cursorFocus = interpolateCursorAt(cursorTelemetry, timeMs);
+		if (cursorFocus) {
+			focus = cursorFocus;
+		}
+	}
+
+	return clampFocusToScale(focus, zoomScale, viewportRatio);
 }
 
 function getConnectedRegionPairs(regions: ZoomRegion[]) {
@@ -96,6 +124,8 @@ function getActiveRegion(
 	regions: ZoomRegion[],
 	timeMs: number,
 	connectedPairs: ConnectedRegionPair[],
+	cursorTelemetry?: CursorTelemetryPoint[],
+	viewportRatio?: ViewportRatio,
 ) {
 	const activeRegions = regions
 		.map((region) => {
@@ -130,21 +160,32 @@ function getActiveRegion(
 	return {
 		region: {
 			...activeRegion,
-			focus: getResolvedFocus(activeRegion, activeScale),
+			focus: getResolvedFocus(activeRegion, activeScale, timeMs, cursorTelemetry, viewportRatio),
 		},
 		strength: activeRegions[0].strength,
 		blendedScale: null,
 	};
 }
 
-function getConnectedRegionHold(timeMs: number, connectedPairs: ConnectedRegionPair[]) {
+function getConnectedRegionHold(
+	timeMs: number,
+	connectedPairs: ConnectedRegionPair[],
+	cursorTelemetry?: CursorTelemetryPoint[],
+	viewportRatio?: ViewportRatio,
+) {
 	for (const pair of connectedPairs) {
 		if (timeMs > pair.transitionEnd && timeMs < pair.nextRegion.startMs) {
 			const nextScale = ZOOM_DEPTH_SCALES[pair.nextRegion.depth];
 			return {
 				region: {
 					...pair.nextRegion,
-					focus: getResolvedFocus(pair.nextRegion, nextScale),
+					focus: getResolvedFocus(
+						pair.nextRegion,
+						nextScale,
+						timeMs,
+						cursorTelemetry,
+						viewportRatio,
+					),
 				},
 				strength: 1,
 				blendedScale: null,
@@ -155,7 +196,12 @@ function getConnectedRegionHold(timeMs: number, connectedPairs: ConnectedRegionP
 	return null;
 }
 
-function getConnectedRegionTransition(connectedPairs: ConnectedRegionPair[], timeMs: number) {
+function getConnectedRegionTransition(
+	connectedPairs: ConnectedRegionPair[],
+	timeMs: number,
+	cursorTelemetry?: CursorTelemetryPoint[],
+	viewportRatio?: ViewportRatio,
+) {
 	for (const pair of connectedPairs) {
 		const { currentRegion, nextRegion, transitionStart, transitionEnd } = pair;
 
@@ -169,8 +215,23 @@ function getConnectedRegionTransition(connectedPairs: ConnectedRegionPair[], tim
 		const currentScale = ZOOM_DEPTH_SCALES[currentRegion.depth];
 		const nextScale = ZOOM_DEPTH_SCALES[nextRegion.depth];
 		const transitionScale = lerp(currentScale, nextScale, transitionProgress);
-		const currentFocus = getResolvedFocus(currentRegion, currentScale);
-		const nextFocus = getResolvedFocus(nextRegion, nextScale);
+		// Both regions share the same timeMs, so interpolate cursor once and reuse.
+		const sharedCursorFocus =
+			cursorTelemetry && cursorTelemetry.length > 0
+				? interpolateCursorAt(cursorTelemetry, timeMs)
+				: null;
+		const currentFocus = clampFocusToScale(
+			currentRegion.focusMode === "auto" && sharedCursorFocus
+				? sharedCursorFocus
+				: currentRegion.focus,
+			currentScale,
+			viewportRatio,
+		);
+		const nextFocus = clampFocusToScale(
+			nextRegion.focusMode === "auto" && sharedCursorFocus ? sharedCursorFocus : nextRegion.focus,
+			nextScale,
+			viewportRatio,
+		);
 		const transitionFocus = getLinearFocus(currentFocus, nextFocus, transitionProgress);
 
 		return {
@@ -204,20 +265,22 @@ export function findDominantRegion(
 	transition: ConnectedPanTransition | null;
 } {
 	const connectedPairs = options.connectZooms ? getConnectedRegionPairs(regions) : [];
+	const telemetry = options.cursorTelemetry;
+	const vr = options.viewportRatio;
 
 	if (options.connectZooms) {
-		const connectedTransition = getConnectedRegionTransition(connectedPairs, timeMs);
+		const connectedTransition = getConnectedRegionTransition(connectedPairs, timeMs, telemetry, vr);
 		if (connectedTransition) {
 			return connectedTransition;
 		}
 
-		const connectedHold = getConnectedRegionHold(timeMs, connectedPairs);
+		const connectedHold = getConnectedRegionHold(timeMs, connectedPairs, telemetry, vr);
 		if (connectedHold) {
 			return { ...connectedHold, transition: null };
 		}
 	}
 
-	const activeRegion = getActiveRegion(regions, timeMs, connectedPairs);
+	const activeRegion = getActiveRegion(regions, timeMs, connectedPairs, telemetry, vr);
 	return activeRegion
 		? { ...activeRegion, transition: null }
 		: { region: null, strength: 0, blendedScale: null, transition: null };

src/contexts/I18nContext.tsx

@@ -0,0 +1,90 @@
+import {
+	createContext,
+	type ReactNode,
+	useCallback,
+	useContext,
+	useEffect,
+	useMemo,
+	useState,
+} from "react";
+import {
+	DEFAULT_LOCALE,
+	type I18nNamespace,
+	LOCALE_STORAGE_KEY,
+	type Locale,
+	SUPPORTED_LOCALES,
+} from "@/i18n/config";
+import { translate } from "@/i18n/loader";
+
+type TranslateVars = Record<string, string | number>;
+
+interface I18nContextValue {
+	locale: Locale;
+	setLocale: (locale: Locale) => void;
+	t: (qualifiedKey: string, vars?: TranslateVars) => string;
+}
+
+const I18nContext = createContext<I18nContextValue | null>(null);
+
+export function useI18n(): I18nContextValue {
+	const ctx = useContext(I18nContext);
+	if (!ctx) throw new Error("useI18n must be used within <I18nProvider>");
+	return ctx;
+}
+
+export function useScopedT(namespace: I18nNamespace) {
+	const { locale } = useI18n();
+	return useCallback(
+		(key: string, vars?: TranslateVars): string => translate(locale, namespace, key, vars),
+		[locale, namespace],
+	);
+}
+
+function isSupportedLocale(value: string): value is Locale {
+	return (SUPPORTED_LOCALES as readonly string[]).includes(value);
+}
+
+function getInitialLocale(): Locale {
+	try {
+		const stored = localStorage.getItem(LOCALE_STORAGE_KEY);
+		if (stored && isSupportedLocale(stored)) return stored;
+	} catch {
+		// localStorage may be unavailable
+	}
+	return DEFAULT_LOCALE;
+}
+
+export function I18nProvider({ children }: { children: ReactNode }) {
+	const [locale, setLocaleState] = useState<Locale>(getInitialLocale);
+
+	const setLocale = useCallback((newLocale: Locale) => {
+		setLocaleState(newLocale);
+		try {
+			localStorage.setItem(LOCALE_STORAGE_KEY, newLocale);
+		} catch {
+			// localStorage may be unavailable
+		}
+		document.documentElement.lang = newLocale;
+		// Notify Electron main process
+		window.electronAPI?.setLocale?.(newLocale);
+	}, []);
+
+	useEffect(() => {
+		document.documentElement.lang = locale;
+	}, [locale]);
+
+	const t = useCallback(
+		(qualifiedKey: string, vars?: TranslateVars): string => {
+			const dotIndex = qualifiedKey.indexOf(".");
+			if (dotIndex === -1) return qualifiedKey;
+			const namespace = qualifiedKey.slice(0, dotIndex) as I18nNamespace;
+			const key = qualifiedKey.slice(dotIndex + 1);
+			return translate(locale, namespace, key, vars);
+		},
+		[locale],
+	);
+
+	const value = useMemo<I18nContextValue>(() => ({ locale, setLocale, t }), [locale, setLocale, t]);
+
+	return <I18nContext.Provider value={value}>{children}</I18nContext.Provider>;
+}

src/hooks/useCameraDevices.test.ts

@@ -0,0 +1,113 @@
+import { act, renderHook, waitFor } from "@testing-library/react";
+import { afterEach, beforeEach, describe, expect, it, vi } from "vitest";
+import { useCameraDevices } from "./useCameraDevices";
+
+// Mock navigator.mediaDevices
+const mockDevices = [
+	{ kind: "videoinput", deviceId: "cam1", label: "Camera 1", groupId: "group1" },
+	{ kind: "videoinput", deviceId: "cam2", label: "Camera 2", groupId: "group1" },
+	{ kind: "audioinput", deviceId: "mic1", label: "Mic 1", groupId: "group2" },
+];
+
+const mockGetUserMedia = vi.fn().mockResolvedValue({
+	getTracks: () => [{ stop: vi.fn() }],
+});
+
+const mockEnumerateDevices = vi.fn().mockResolvedValue(mockDevices);
+
+Object.defineProperty(global.navigator, "mediaDevices", {
+	value: {
+		enumerateDevices: mockEnumerateDevices,
+		getUserMedia: mockGetUserMedia,
+		addEventListener: vi.fn(),
+		removeEventListener: vi.fn(),
+	},
+	configurable: true,
+});
+
+describe("useCameraDevices", () => {
+	beforeEach(() => {
+		vi.clearAllMocks();
+		mockEnumerateDevices.mockResolvedValue(mockDevices);
+		mockGetUserMedia.mockResolvedValue({
+			getTracks: () => [{ stop: vi.fn() }],
+		});
+	});
+
+	afterEach(() => {
+		vi.resetAllMocks();
+	});
+
+	it("should list video input devices", async () => {
+		const { result } = renderHook(() => useCameraDevices(true));
+
+		await waitFor(() => {
+			expect(result.current.devices).toHaveLength(2);
+		});
+
+		expect(result.current.devices[0].label).toBe("Camera 1");
+		expect(result.current.devices[1].deviceId).toBe("cam2");
+	});
+
+	it("should set first device as default", async () => {
+		const { result } = renderHook(() => useCameraDevices(true));
+
+		await waitFor(() => {
+			expect(result.current.selectedDeviceId).toBe("cam1");
+		});
+	});
+
+	it("should use device ID as fallback label when label is missing", async () => {
+		mockEnumerateDevices.mockResolvedValueOnce([
+			{ kind: "videoinput", deviceId: "cam1abc123456", label: "", groupId: "group1" },
+		]);
+
+		const { result } = renderHook(() => useCameraDevices(true));
+
+		await waitFor(() => {
+			expect(result.current.devices[0]?.label).toBe("Camera cam1abc1");
+		});
+
+		expect(mockGetUserMedia).not.toHaveBeenCalled();
+	});
+
+	it("should set error state when enumeration fails", async () => {
+		mockEnumerateDevices.mockRejectedValueOnce(new Error("Permission denied"));
+
+		const { result } = renderHook(() => useCameraDevices(true));
+
+		await waitFor(() => {
+			expect(result.current.error).toBe("Permission denied");
+		});
+
+		expect(result.current.devices).toHaveLength(0);
+		expect(result.current.isLoading).toBe(false);
+	});
+
+	it("should fall back to first available device when selected device is unplugged", async () => {
+		const { result } = renderHook(() => useCameraDevices(true));
+
+		await waitFor(() => {
+			expect(result.current.selectedDeviceId).toBe("cam1");
+		});
+
+		// Simulate cam1 being unplugged — only cam2 remains
+		const cam2Only = [
+			{ kind: "videoinput", deviceId: "cam2", label: "Camera 2", groupId: "group1" },
+		];
+		mockEnumerateDevices.mockResolvedValueOnce(cam2Only);
+
+		// Trigger devicechange event via the registered handler
+		const devicechangeHandler = (
+			navigator.mediaDevices.addEventListener as ReturnType<typeof vi.fn>
+		).mock.calls[0]?.[1] as (() => void) | undefined;
+
+		await act(async () => {
+			devicechangeHandler?.();
+		});
+
+		await waitFor(() => {
+			expect(result.current.selectedDeviceId).toBe("cam2");
+		});
+	});
+});

src/hooks/useCameraDevices.ts

@@ -0,0 +1,64 @@
+import { useEffect, useRef, useState } from "react";
+
+export interface CameraDevice {
+	deviceId: string;
+	label: string;
+	groupId: string;
+}
+
+export function useCameraDevices(enabled: boolean = false) {
+	const [devices, setDevices] = useState<CameraDevice[]>([]);
+	const [selectedDeviceId, setSelectedDeviceId] = useState<string>("");
+	const [isLoading, setIsLoading] = useState(false);
+	const [error, setError] = useState<string | null>(null);
+	const selectedDeviceIdRef = useRef(selectedDeviceId);
+	selectedDeviceIdRef.current = selectedDeviceId;
+
+	useEffect(() => {
+		if (!enabled) return;
+		let mounted = true;
+
+		const loadDevices = async () => {
+			try {
+				setIsLoading(true);
+				setError(null);
+
+				// Enumerate without requesting a second stream — the recorder handles
+				// the real acquisition; unlabeled devices fall back to their device ID.
+				const allDevices = await navigator.mediaDevices.enumerateDevices();
+				const videoInputs = allDevices
+					.filter((device) => device.kind === "videoinput")
+					.map((device) => ({
+						deviceId: device.deviceId,
+						label: device.label || `Camera ${device.deviceId.slice(0, 8)}`,
+						groupId: device.groupId,
+					}));
+
+				if (mounted) {
+					setDevices(videoInputs);
+					const currentId = selectedDeviceIdRef.current;
+					const stillAvailable = videoInputs.some((d) => d.deviceId === currentId);
+					if (!currentId || !stillAvailable) {
+						setSelectedDeviceId(videoInputs[0]?.deviceId ?? "");
+					}
+					setIsLoading(false);
+				}
+			} catch (err) {
+				if (mounted) {
+					setError(err instanceof Error ? err.message : "Failed to load cameras");
+					setIsLoading(false);
+				}
+			}
+		};
+
+		loadDevices();
+
+		navigator.mediaDevices.addEventListener("devicechange", loadDevices);
+		return () => {
+			mounted = false;
+			navigator.mediaDevices.removeEventListener("devicechange", loadDevices);
+		};
+	}, [enabled]);
+
+	return { devices, selectedDeviceId, setSelectedDeviceId, isLoading, error };
+}

src/hooks/useEditorHistory.ts

@@ -4,9 +4,17 @@ import type {
 	CropRegion,
 	SpeedRegion,
 	TrimRegion,
+	WebcamLayoutPreset,
+	WebcamMaskShape,
+	WebcamPosition,
 	ZoomRegion,
 } from "@/components/video-editor/types";
-import { DEFAULT_CROP_REGION } from "@/components/video-editor/types";
+import {
+	DEFAULT_CROP_REGION,
+	DEFAULT_WEBCAM_LAYOUT_PRESET,
+	DEFAULT_WEBCAM_MASK_SHAPE,
+	DEFAULT_WEBCAM_POSITION,
+} from "@/components/video-editor/types";
 import type { AspectRatio } from "@/utils/aspectRatioUtils";
 
 // Undoable state — selection IDs are intentionally excluded (undoing a
@@ -24,6 +32,9 @@ export interface EditorState {
 	borderRadius: number;
 	padding: number;
 	aspectRatio: AspectRatio;
+	webcamLayoutPreset: WebcamLayoutPreset;
+	webcamMaskShape: WebcamMaskShape;
+	webcamPosition: WebcamPosition | null;
 }
 
 export const INITIAL_EDITOR_STATE: EditorState = {
@@ -39,6 +50,9 @@ export const INITIAL_EDITOR_STATE: EditorState = {
 	borderRadius: 0,
 	padding: 50,
 	aspectRatio: "16:9",
+	webcamLayoutPreset: DEFAULT_WEBCAM_LAYOUT_PRESET,
+	webcamMaskShape: DEFAULT_WEBCAM_MASK_SHAPE,
+	webcamPosition: DEFAULT_WEBCAM_POSITION,
 };
 
 type StateUpdate = Partial<EditorState> | ((prev: EditorState) => Partial<EditorState>);

src/hooks/useScreenRecorder.ts

@@ -1,6 +1,8 @@
 import { fixWebmDuration } from "@fix-webm-duration/fix";
 import { useCallback, useEffect, useRef, useState } from "react";
 import { toast } from "sonner";
+import { useScopedT } from "@/contexts/I18nContext";
+import { requestCameraAccess } from "@/lib/requestCameraAccess";
 
 const TARGET_FRAME_RATE = 60;
 const MIN_FRAME_RATE = 30;
@@ -39,12 +41,18 @@ const WEBCAM_TARGET_FRAME_RATE = 30;
 
 type UseScreenRecorderReturn = {
 	recording: boolean;
+	paused: boolean;
+	elapsedSeconds: number;
 	toggleRecording: () => void;
+	togglePaused: () => void;
 	restartRecording: () => void;
+	cancelRecording: () => void;
 	microphoneEnabled: boolean;
 	setMicrophoneEnabled: (enabled: boolean) => void;
 	microphoneDeviceId: string | undefined;
 	setMicrophoneDeviceId: (deviceId: string | undefined) => void;
+	webcamDeviceId: string | undefined;
+	setWebcamDeviceId: (deviceId: string | undefined) => void;
 	systemAudioEnabled: boolean;
 	setSystemAudioEnabled: (enabled: boolean) => void;
 	webcamEnabled: boolean;
@@ -79,9 +87,13 @@ function createRecorderHandle(stream: MediaStream, options: MediaRecorderOptions
 }
 
 export function useScreenRecorder(): UseScreenRecorderReturn {
+	const t = useScopedT("editor");
 	const [recording, setRecording] = useState(false);
+	const [paused, setPaused] = useState(false);
+	const [elapsedSeconds, setElapsedSeconds] = useState(0);
 	const [microphoneEnabled, setMicrophoneEnabled] = useState(false);
 	const [microphoneDeviceId, setMicrophoneDeviceId] = useState<string | undefined>(undefined);
+	const [webcamDeviceId, setWebcamDeviceId] = useState<string | undefined>(undefined);
 	const [systemAudioEnabled, setSystemAudioEnabled] = useState(false);
 	const [webcamEnabled, setWebcamEnabledState] = useState(false);
 	const screenRecorder = useRef<RecorderHandle | null>(null);
@@ -91,13 +103,20 @@ export function useScreenRecorder(): UseScreenRecorderReturn {
 	const microphoneStream = useRef<MediaStream | null>(null);
 	const webcamStream = useRef<MediaStream | null>(null);
 	const mixingContext = useRef<AudioContext | null>(null);
-	const startTime = useRef<number>(0);
 	const recordingId = useRef<number>(0);
+	const accumulatedDurationMs = useRef(0);
+	const segmentStartedAt = useRef<number | null>(null);
 	const finalizingRecordingId = useRef<number | null>(null);
 	const allowAutoFinalize = useRef(false);
 	const discardRecordingId = useRef<number | null>(null);
 	const restarting = useRef(false);
 
+	const getRecordingDurationMs = useCallback(() => {
+		const segmentDuration =
+			segmentStartedAt.current === null ? 0 : Date.now() - segmentStartedAt.current;
+		return accumulatedDurationMs.current + segmentDuration;
+	}, []);
+
 	const selectMimeType = () => {
 		const preferred = [
 			"video/webm;codecs=av1",
@@ -151,37 +170,29 @@ export function useScreenRecorder(): UseScreenRecorderReturn {
 		}
 	}, []);
 
-	const setWebcamEnabled = useCallback(async (enabled: boolean) => {
-		if (!enabled) {
-			setWebcamEnabledState(false);
-			return true;
-		}
+	const setWebcamEnabled = useCallback(
+		async (enabled: boolean) => {
+			if (!enabled) {
+				setWebcamEnabledState(false);
+				return true;
+			}
 
-		const accessResult = await window.electronAPI.requestCameraAccess();
-		if (!accessResult.success) {
-			toast.error("Failed to request camera access.");
-			return false;
-		}
+			const accessResult = await requestCameraAccess();
+			if (!accessResult.success) {
+				toast.error(t("recording.failedCameraAccess"));
+				return false;
+			}
 
-		if (!accessResult.granted) {
-			toast.error("Camera access is blocked. Enable it in system settings to use the webcam.");
-			return false;
-		}
+			if (!accessResult.granted) {
+				toast.error(t("recording.cameraBlocked"));
+				return false;
+			}
 
-		try {
-			const probeStream = await navigator.mediaDevices.getUserMedia({
-				audio: false,
-				video: true,
-			});
-			probeStream.getTracks().forEach((track) => track.stop());
 			setWebcamEnabledState(true);
 			return true;
-		} catch (error) {
-			console.warn("Failed to preflight webcam access:", error);
-			toast.error("Camera access denied. Webcam overlay will stay disabled.");
-			return false;
-		}
-	}, []);
+		},
+		[t],
+	);
 
 	const finalizeRecording = useCallback(
 		(
@@ -204,6 +215,10 @@ export function useScreenRecorder(): UseScreenRecorderReturn {
 
 			teardownMedia();
 			setRecording(false);
+			setPaused(false);
+			setElapsedSeconds(0);
+			accumulatedDurationMs.current = 0;
+			segmentStartedAt.current = null;
 			window.electronAPI?.setRecordingState(false);
 
 			void (async () => {
@@ -275,7 +290,7 @@ export function useScreenRecorder(): UseScreenRecorderReturn {
 		}
 
 		const activeWebcamRecorder = webcamRecorder.current;
-		const duration = Date.now() - startTime.current;
+		const duration = getRecordingDurationMs();
 		const activeRecordingId = recordingId.current;
 
 		finalizeRecording(
@@ -285,7 +300,10 @@ export function useScreenRecorder(): UseScreenRecorderReturn {
 			activeRecordingId,
 		);
 
-		if (activeScreenRecorder.recorder.state === "recording") {
+		if (
+			activeScreenRecorder.recorder.state === "recording" ||
+			activeScreenRecorder.recorder.state === "paused"
+		) {
 			try {
 				activeScreenRecorder.recorder.stop();
 			} catch {
@@ -293,7 +311,10 @@ export function useScreenRecorder(): UseScreenRecorderReturn {
 			}
 		}
 		if (activeWebcamRecorder) {
-			if (activeWebcamRecorder.recorder.state === "recording") {
+			if (
+				activeWebcamRecorder.recorder.state === "recording" ||
+				activeWebcamRecorder.recorder.state === "paused"
+			) {
 				try {
 					activeWebcamRecorder.recorder.stop();
 				} catch {
@@ -318,14 +339,20 @@ export function useScreenRecorder(): UseScreenRecorderReturn {
 			restarting.current = false;
 			discardRecordingId.current = null;
 
-			if (screenRecorder.current?.recorder.state === "recording") {
+			if (
+				screenRecorder.current?.recorder.state === "recording" ||
+				screenRecorder.current?.recorder.state === "paused"
+			) {
 				try {
 					screenRecorder.current.recorder.stop();
 				} catch {
 					// Ignore recorder teardown errors during cleanup.
 				}
 			}
-			if (webcamRecorder.current?.recorder.state === "recording") {
+			if (
+				webcamRecorder.current?.recorder.state === "recording" ||
+				webcamRecorder.current?.recorder.state === "paused"
+			) {
 				try {
 					webcamRecorder.current.recorder.stop();
 				} catch {
@@ -342,7 +369,7 @@ export function useScreenRecorder(): UseScreenRecorderReturn {
 		try {
 			const selectedSource = await window.electronAPI.getSelectedSource();
 			if (!selectedSource) {
-				alert("Please select a source to record");
+				alert(t("recording.selectSource"));
 				return;
 			}
 
@@ -372,7 +399,7 @@ export function useScreenRecorder(): UseScreenRecorderReturn {
 					} as unknown as MediaStreamConstraints);
 				} catch (audioErr) {
 					console.warn("System audio capture failed, falling back to video-only:", audioErr);
-					toast.error("System audio not available. Recording without system audio.");
+					toast.error(t("recording.systemAudioUnavailable"));
 					screenMediaStream = await navigator.mediaDevices.getUserMedia({
 						audio: false,
 						video: videoConstraints,
@@ -405,7 +432,7 @@ export function useScreenRecorder(): UseScreenRecorderReturn {
 					});
 				} catch (audioError) {
 					console.warn("Failed to get microphone access:", audioError);
-					toast.error("Microphone access denied. Recording will continue without audio.");
+					toast.error(t("recording.microphoneDenied"));
 					setMicrophoneEnabled(false);
 				}
 			}
@@ -414,11 +441,18 @@ export function useScreenRecorder(): UseScreenRecorderReturn {
 				try {
 					webcamStream.current = await navigator.mediaDevices.getUserMedia({
 						audio: false,
-						video: {
-							width: { ideal: WEBCAM_TARGET_WIDTH },
-							height: { ideal: WEBCAM_TARGET_HEIGHT },
-							frameRate: { ideal: WEBCAM_TARGET_FRAME_RATE, max: WEBCAM_TARGET_FRAME_RATE },
-						},
+						video: webcamDeviceId
+							? {
+									deviceId: { exact: webcamDeviceId },
+									width: { ideal: WEBCAM_TARGET_WIDTH },
+									height: { ideal: WEBCAM_TARGET_HEIGHT },
+									frameRate: { ideal: WEBCAM_TARGET_FRAME_RATE, max: WEBCAM_TARGET_FRAME_RATE },
+								}
+							: {
+									width: { ideal: WEBCAM_TARGET_WIDTH },
+									height: { ideal: WEBCAM_TARGET_HEIGHT },
+									frameRate: { ideal: WEBCAM_TARGET_FRAME_RATE, max: WEBCAM_TARGET_FRAME_RATE },
+								},
 					});
 				} catch (cameraError) {
 					console.warn("Failed to get webcam access:", cameraError);
@@ -427,7 +461,7 @@ export function useScreenRecorder(): UseScreenRecorderReturn {
 						webcamStream.current = null;
 					}
 					setWebcamEnabledState(false);
-					toast.error("Camera access denied. Recording will continue without webcam.");
+					toast.error(t("recording.cameraDenied"));
 				}
 			}
 
@@ -513,9 +547,12 @@ export function useScreenRecorder(): UseScreenRecorderReturn {
 			}
 
 			recordingId.current = Date.now();
-			startTime.current = recordingId.current;
+			accumulatedDurationMs.current = 0;
+			segmentStartedAt.current = Date.now();
 			allowAutoFinalize.current = true;
 			setRecording(true);
+			setPaused(false);
+			setElapsedSeconds(0);
 			window.electronAPI?.setRecordingState(true);
 
 			const activeScreenRecorder = screenRecorder.current;
@@ -531,7 +568,7 @@ export function useScreenRecorder(): UseScreenRecorderReturn {
 						finalizeRecording(
 							activeScreenRecorder,
 							activeWebcamRecorder ?? null,
-							Math.max(0, Date.now() - startTime.current),
+							Math.max(0, getRecordingDurationMs()),
 							activeRecordingId,
 						);
 					},
@@ -542,17 +579,61 @@ export function useScreenRecorder(): UseScreenRecorderReturn {
 			console.error("Failed to start recording:", error);
 			const errorMsg = error instanceof Error ? error.message : "Failed to start recording";
 			if (errorMsg.includes("Permission denied") || errorMsg.includes("NotAllowedError")) {
-				toast.error("Recording permission denied. Please allow screen recording.");
+				toast.error(t("recording.permissionDenied"));
 			} else {
 				toast.error(errorMsg);
 			}
 			setRecording(false);
+			setPaused(false);
+			setElapsedSeconds(0);
+			accumulatedDurationMs.current = 0;
+			segmentStartedAt.current = null;
 			screenRecorder.current = null;
 			webcamRecorder.current = null;
 			teardownMedia();
 		}
 	};
 
+	const togglePaused = () => {
+		const activeScreenRecorder = screenRecorder.current?.recorder;
+		if (!activeScreenRecorder || activeScreenRecorder.state === "inactive") {
+			return;
+		}
+
+		const activeWebcamRecorder = webcamRecorder.current?.recorder;
+
+		if (activeScreenRecorder.state === "paused") {
+			try {
+				activeScreenRecorder.resume();
+				if (activeWebcamRecorder?.state === "paused") {
+					activeWebcamRecorder.resume();
+				}
+				segmentStartedAt.current = Date.now();
+				setPaused(false);
+			} catch (error) {
+				console.error("Failed to resume recording:", error);
+			}
+			return;
+		}
+
+		if (activeScreenRecorder.state !== "recording") {
+			return;
+		}
+
+		try {
+			accumulatedDurationMs.current = getRecordingDurationMs();
+			segmentStartedAt.current = null;
+			setElapsedSeconds(Math.floor(accumulatedDurationMs.current / 1000));
+			activeScreenRecorder.pause();
+			if (activeWebcamRecorder?.state === "recording") {
+				activeWebcamRecorder.pause();
+			}
+			setPaused(true);
+		} catch (error) {
+			console.error("Failed to pause recording:", error);
+		}
+	};
+
 	const toggleRecording = () => {
 		recording ? stopRecording.current() : startRecording();
 	};
@@ -561,13 +642,14 @@ export function useScreenRecorder(): UseScreenRecorderReturn {
 		if (restarting.current) return;
 
 		const activeScreenRecorder = screenRecorder.current;
-		if (!activeScreenRecorder || activeScreenRecorder.recorder.state !== "recording") return;
+		if (!activeScreenRecorder || activeScreenRecorder.recorder.state === "inactive") return;
 
 		const activeWebcamRecorder = webcamRecorder.current;
 		const activeRecordingId = recordingId.current;
 
 		restarting.current = true;
 		discardRecordingId.current = activeRecordingId;
+		allowAutoFinalize.current = false;
 
 		const stopPromises = [
 			new Promise<void>((resolve) => {
@@ -575,7 +657,10 @@ export function useScreenRecorder(): UseScreenRecorderReturn {
 			}),
 		];
 
-		if (activeWebcamRecorder?.recorder.state === "recording") {
+		if (
+			activeWebcamRecorder?.recorder.state === "recording" ||
+			activeWebcamRecorder?.recorder.state === "paused"
+		) {
 			stopPromises.push(
 				new Promise<void>((resolve) => {
 					activeWebcamRecorder.recorder.addEventListener("stop", () => resolve(), {
@@ -595,14 +680,49 @@ export function useScreenRecorder(): UseScreenRecorderReturn {
 		}
 	};
 
+	useEffect(() => {
+		if (!recording) {
+			setElapsedSeconds(0);
+			return;
+		}
+
+		setElapsedSeconds(Math.floor(getRecordingDurationMs() / 1000));
+		if (paused) {
+			return;
+		}
+
+		const interval = window.setInterval(() => {
+			setElapsedSeconds(Math.floor(getRecordingDurationMs() / 1000));
+		}, 250);
+
+		return () => window.clearInterval(interval);
+	}, [getRecordingDurationMs, paused, recording]);
+
+	const cancelRecording = () => {
+		const activeScreenRecorder = screenRecorder.current;
+		if (!activeScreenRecorder || activeScreenRecorder.recorder.state !== "recording") return;
+
+		const activeRecordingId = recordingId.current;
+		discardRecordingId.current = activeRecordingId;
+		allowAutoFinalize.current = false;
+
+		stopRecording.current();
+	};
+
 	return {
 		recording,
+		paused,
+		elapsedSeconds,
 		toggleRecording,
+		togglePaused,
 		restartRecording,
+		cancelRecording,
 		microphoneEnabled,
 		setMicrophoneEnabled,
 		microphoneDeviceId,
 		setMicrophoneDeviceId,
+		webcamDeviceId,
+		setWebcamDeviceId,
 		systemAudioEnabled,
 		setSystemAudioEnabled,
 		webcamEnabled,

src/i18n/config.ts

@@ -0,0 +1,16 @@
+export const DEFAULT_LOCALE = "en" as const;
+export const SUPPORTED_LOCALES = ["en", "zh-CN", "es"] as const;
+export const I18N_NAMESPACES = [
+	"common",
+	"dialogs",
+	"editor",
+	"launch",
+	"settings",
+	"shortcuts",
+	"timeline",
+] as const;
+
+export type Locale = (typeof SUPPORTED_LOCALES)[number];
+export type I18nNamespace = (typeof I18N_NAMESPACES)[number];
+
+export const LOCALE_STORAGE_KEY = "openscreen-locale";

src/i18n/loader.ts

@@ -0,0 +1,60 @@
+import { DEFAULT_LOCALE, type I18nNamespace, type Locale } from "./config";
+
+type MessageMap = Record<string, unknown>;
+
+const modules = import.meta.glob("./locales/**/*.json", { eager: true }) as Record<
+	string,
+	{ default: MessageMap }
+>;
+
+const messages: Record<string, Record<string, MessageMap>> = {};
+
+for (const [path, mod] of Object.entries(modules)) {
+	// path looks like "./locales/en/common.json"
+	const parts = path.replace("./locales/", "").replace(".json", "").split("/");
+	const locale = parts[0];
+	const namespace = parts[1];
+	if (!messages[locale]) messages[locale] = {};
+	messages[locale][namespace] = mod.default;
+}
+
+function getMessageValue(obj: unknown, dotPath: string): string | undefined {
+	const keys = dotPath.split(".");
+	let current: unknown = obj;
+	for (const key of keys) {
+		if (current == null || typeof current !== "object") return undefined;
+		current = (current as Record<string, unknown>)[key];
+	}
+	return typeof current === "string" ? current : undefined;
+}
+
+function interpolate(str: string, vars?: Record<string, string | number>): string {
+	if (!vars) return str;
+	return str.replace(/\{\{(\w+)\}\}/g, (_, key: string) => String(vars[key] ?? `{{${key}}}`));
+}
+
+export function getMessages(locale: Locale, namespace: I18nNamespace): MessageMap {
+	return messages[locale]?.[namespace] ?? {};
+}
+
+export function getLocaleName(locale: Locale): string {
+	return getMessageValue(messages[locale]?.common, "locale.name") ?? locale;
+}
+
+export function getLocaleShort(locale: Locale): string {
+	return getMessageValue(messages[locale]?.common, "locale.short") ?? locale;
+}
+
+export function translate(
+	locale: Locale,
+	namespace: I18nNamespace,
+	key: string,
+	vars?: Record<string, string | number>,
+): string {
+	const value =
+		getMessageValue(messages[locale]?.[namespace], key) ??
+		getMessageValue(messages[DEFAULT_LOCALE]?.[namespace], key);
+
+	if (value == null) return `${namespace}.${key}`;
+	return interpolate(value, vars);
+}

src/i18n/locales/en/common.json

@@ -0,0 +1,29 @@
+{
+	"actions": {
+		"cancel": "Cancel",
+		"save": "Save",
+		"delete": "Delete",
+		"close": "Close",
+		"share": "Share",
+		"done": "Done",
+		"open": "Open",
+		"upload": "Upload",
+		"export": "Export",
+		"file": "File",
+		"edit": "Edit",
+		"view": "View",
+		"window": "Window",
+		"quit": "Quit",
+		"stopRecording": "Stop Recording"
+	},
+	"playback": {
+		"play": "Play",
+		"pause": "Pause",
+		"fullscreen": "Fullscreen",
+		"exitFullscreen": "Exit Fullscreen"
+	},
+	"locale": {
+		"name": "English",
+		"short": "EN"
+	}
+}

src/i18n/locales/en/dialogs.json

@@ -0,0 +1,68 @@
+{
+	"export": {
+		"complete": "Export Complete",
+		"yourFormatReady": "Your {{format}} is ready",
+		"showInFolder": "Show in Folder",
+		"finalizingVideo": "Finalizing video export...",
+		"compilingGifProgress": "Compiling GIF... {{progress}}%",
+		"compilingGifWait": "Compiling GIF... This may take a while",
+		"takeMoment": "This may take a moment...",
+		"failed": "Export Failed",
+		"tryAgain": "Please try again",
+		"finalizingVideoTitle": "Finalizing Video",
+		"compilingGif": "Compiling GIF",
+		"exportingFormat": "Exporting {{format}}",
+		"compiling": "Compiling",
+		"renderingFrames": "Rendering Frames",
+		"processing": "Processing...",
+		"finalizing": "Finalizing...",
+		"compilingStatus": "Compiling...",
+		"status": "Status",
+		"format": "Format",
+		"frames": "Frames",
+		"cancelExport": "Cancel Export",
+		"savedSuccessfully": "{{format}} saved successfully!"
+	},
+	"tutorial": {
+		"triggerLabel": "How trimming works",
+		"title": "How Trimming Works",
+		"description": "Understanding how to cut out unwanted parts of your video.",
+		"explanation": "The Trim tool works by defining the segments you want to",
+		"explanationRemove": "remove",
+		"explanationCovered": "covered",
+		"explanationEnd": "by a red trim segment will be cut out when you export.",
+		"visualExample": "Visual Example",
+		"removed": "REMOVED",
+		"kept": "Kept",
+		"part1": "Part 1",
+		"part2": "Part 2",
+		"part3": "Part 3",
+		"finalVideo": "Final Video",
+		"step1Title": "1. Add Trim",
+		"step1Description": "Press T or click the scissors icon to mark a section for removal.",
+		"step2Title": "2. Adjust",
+		"step2Description": "Drag the edges of the red region to cover exactly what you want to cut out."
+	},
+	"unsavedChanges": {
+		"title": "Unsaved Changes",
+		"message": "You have unsaved changes.",
+		"detail": "Do you want to save your project before closing?",
+		"saveAndClose": "Save & Close",
+		"discardAndClose": "Discard & Close",
+		"loadProject": "Load Project…",
+		"saveProject": "Save Project…",
+		"saveProjectAs": "Save Project As…"
+	},
+	"fileDialogs": {
+		"saveGif": "Save Exported GIF",
+		"saveVideo": "Save Exported Video",
+		"selectVideo": "Select Video File",
+		"saveProject": "Save OpenScreen Project",
+		"openProject": "Open OpenScreen Project",
+		"gifImage": "GIF Image",
+		"mp4Video": "MP4 Video",
+		"videoFiles": "Video Files",
+		"openscreenProject": "OpenScreen Project",
+		"allFiles": "All Files"
+	}
+}

src/i18n/locales/en/editor.json

@@ -0,0 +1,35 @@
+{
+	"errors": {
+		"noVideoLoaded": "No video loaded",
+		"videoNotReady": "Video not ready",
+		"unableToDetermineSourcePath": "Unable to determine source video path",
+		"failedToSaveGif": "Failed to save GIF",
+		"gifExportFailed": "GIF export failed",
+		"failedToSaveVideo": "Failed to save video",
+		"exportFailed": "Export failed",
+		"exportFailedWithError": "Export failed: {{error}}",
+		"failedToSaveExport": "Failed to save export",
+		"failedToSaveExportedVideo": "Failed to save exported video",
+		"failedToRevealInFolder": "Error revealing in folder: {{error}}"
+	},
+	"export": {
+		"canceled": "Export canceled",
+		"exportedSuccessfully": "{{format}} exported successfully"
+	},
+	"project": {
+		"saveCanceled": "Project save canceled",
+		"failedToSave": "Failed to save project",
+		"savedTo": "Project saved to {{path}}",
+		"failedToLoad": "Failed to load project",
+		"invalidFormat": "Invalid project file format",
+		"loadedFrom": "Project loaded from {{path}}"
+	},
+	"recording": {
+		"failedCameraAccess": "Failed to request camera access.",
+		"cameraBlocked": "Camera access is blocked. Enable it in system settings to use the webcam.",
+		"systemAudioUnavailable": "System audio not available. Recording without system audio.",
+		"microphoneDenied": "Microphone access denied. Recording will continue without audio.",
+		"cameraDenied": "Camera access denied. Recording will continue without webcam.",
+		"permissionDenied": "Recording permission denied. Please allow screen recording."
+	}
+}

src/i18n/locales/en/launch.json

@@ -0,0 +1,37 @@
+{
+	"tooltips": {
+		"hideHUD": "Hide HUD",
+		"closeApp": "Close App",
+		"restartRecording": "Restart recording",
+		"cancelRecording": "Cancel recording",
+		"pauseRecording": "Pause recording",
+		"resumeRecording": "Resume recording",
+		"openVideoFile": "Open video file",
+		"openProject": "Open project"
+	},
+	"audio": {
+		"enableSystemAudio": "Enable system audio",
+		"disableSystemAudio": "Disable system audio",
+		"enableMicrophone": "Enable microphone",
+		"disableMicrophone": "Disable microphone",
+		"defaultMicrophone": "Default Microphone"
+	},
+	"webcam": {
+		"enableWebcam": "Enable webcam",
+		"disableWebcam": "Disable webcam",
+		"defaultCamera": "Default Camera",
+		"searching": "Searching...",
+		"noneFound": "No camera found",
+		"unavailable": "Camera unavailable"
+	},
+	"sourceSelector": {
+		"loading": "Loading sources...",
+		"screens": "Screens ({{count}})",
+		"windows": "Windows ({{count}})",
+		"defaultSourceName": "Screen"
+	},
+	"recording": {
+		"selectSource": "Please select a source to record"
+	},
+	"language": "Language"
+}

src/i18n/locales/en/settings.json

@@ -0,0 +1,159 @@
+{
+	"zoom": {
+		"level": "Zoom Level",
+		"selectRegion": "Select a zoom region to adjust",
+		"deleteZoom": "Delete Zoom",
+		"focusMode": {
+			"title": "Focus Mode",
+			"manual": "Manual",
+			"auto": "Auto",
+			"autoDescription": "Camera follows the recorded cursor position"
+		}
+	},
+	"speed": {
+		"playbackSpeed": "Playback Speed",
+		"selectRegion": "Select a speed region to adjust",
+		"deleteRegion": "Delete Speed Region"
+	},
+	"trim": {
+		"deleteRegion": "Delete Trim Region"
+	},
+	"layout": {
+		"title": "Layout",
+		"preset": "Preset",
+		"selectPreset": "Select preset",
+		"pictureInPicture": "Picture in Picture",
+		"verticalStack": "Vertical Stack",
+		"webcamShape": "Camera Shape"
+	},
+	"effects": {
+		"title": "Video Effects",
+		"blurBg": "Blur BG",
+		"motionBlur": "Motion Blur",
+		"off": "off",
+		"shadow": "Shadow",
+		"roundness": "Roundness",
+		"padding": "Padding"
+	},
+	"background": {
+		"title": "Background",
+		"image": "Image",
+		"color": "Color",
+		"gradient": "Gradient",
+		"uploadCustom": "Upload Custom",
+		"gradientLabel": "Gradient {{index}}"
+	},
+	"crop": {
+		"title": "Crop",
+		"cropVideo": "Crop Video",
+		"dragInstruction": "Drag on each side to adjust the crop area",
+		"ratio": "Ratio",
+		"free": "Free",
+		"done": "Done",
+		"lockAspectRatio": "Lock aspect ratio",
+		"unlockAspectRatio": "Unlock aspect ratio"
+	},
+	"exportFormat": {
+		"mp4": "MP4",
+		"gif": "GIF",
+		"mp4Video": "MP4 Video",
+		"mp4Description": "High quality video file",
+		"gifAnimation": "GIF Animation",
+		"gifDescription": "Animated image for sharing"
+	},
+	"exportQuality": {
+		"title": "Export Quality",
+		"low": "Low",
+		"medium": "Medium",
+		"high": "High"
+	},
+	"gifSettings": {
+		"frameRate": "GIF Frame Rate",
+		"size": "GIF Size",
+		"loop": "Loop GIF"
+	},
+	"project": {
+		"save": "Save Project",
+		"load": "Load Project"
+	},
+	"export": {
+		"videoButton": "Export Video",
+		"gifButton": "Export GIF",
+		"chooseSaveLocation": "Choose Save Location"
+	},
+	"links": {
+		"reportBug": "Report Bug",
+		"starOnGithub": "Star on GitHub"
+	},
+	"imageUpload": {
+		"invalidFileType": "Invalid file type",
+		"jpgOnly": "Please upload a JPG or JPEG image file.",
+		"uploadSuccess": "Custom image uploaded successfully!",
+		"failedToUpload": "Failed to upload image",
+		"errorReading": "There was an error reading the file."
+	},
+	"annotation": {
+		"title": "Annotation Settings",
+		"active": "Active",
+		"typeText": "Text",
+		"typeImage": "Image",
+		"typeArrow": "Arrow",
+		"textContent": "Text Content",
+		"textPlaceholder": "Enter your text...",
+		"fontStyle": "Font Style",
+		"selectStyle": "Select style",
+		"size": "Size",
+		"customFonts": "Custom Fonts",
+		"textColor": "Text Color",
+		"background": "Background",
+		"none": "None",
+		"color": "Color",
+		"clearBackground": "Clear Background",
+		"uploadImage": "Upload Image",
+		"supportedFormats": "Supported formats: JPG, PNG, GIF, WebP",
+		"arrowDirection": "Arrow Direction",
+		"strokeWidth": "Stroke Width: {{width}}px",
+		"arrowColor": "Arrow Color",
+		"deleteAnnotation": "Delete Annotation",
+		"shortcutsAndTips": "Shortcuts & Tips",
+		"tipMovePlayhead": "Move playhead to overlapping annotation section and select an item.",
+		"tipTabCycle": "Use Tab to cycle through overlapping items.",
+		"tipShiftTabCycle": "Use Shift+Tab to cycle backwards.",
+		"invalidImageType": "Invalid file type",
+		"imageFormatsOnly": "Please upload a JPG, PNG, GIF, or WebP image file.",
+		"imageUploadSuccess": "Image uploaded successfully!",
+		"failedImageUpload": "Failed to upload image"
+	},
+	"fontStyles": {
+		"classic": "Classic",
+		"editor": "Editor",
+		"strong": "Strong",
+		"typewriter": "Typewriter",
+		"deco": "Deco",
+		"simple": "Simple",
+		"modern": "Modern",
+		"clean": "Clean"
+	},
+	"customFont": {
+		"dialogTitle": "Add Google Font",
+		"urlLabel": "Google Fonts Import URL",
+		"urlPlaceholder": "https://fonts.googleapis.com/css2?family=Roboto&display=swap",
+		"urlHelp": "Get this from Google Fonts: Select a font → Click \"Get font\" → Copy the @import URL",
+		"nameLabel": "Display Name",
+		"namePlaceholder": "My Custom Font",
+		"nameHelp": "This is how the font will appear in the font selector",
+		"addButton": "Add Font",
+		"addingButton": "Adding...",
+		"errorEmptyUrl": "Please enter a Google Fonts import URL",
+		"errorInvalidUrl": "Please enter a valid Google Fonts URL",
+		"errorEmptyName": "Please enter a font name",
+		"errorExtractFailed": "Could not extract font family from URL",
+		"successMessage": "Font \"{{fontName}}\" added successfully",
+		"failedToAdd": "Failed to add font",
+		"errorTimeout": "Font took too long to load. Please check the URL and try again.",
+		"errorLoadFailed": "The font could not be loaded. Please verify the Google Fonts URL is correct."
+	},
+	"language": {
+		"title": "Language"
+	}
+}

src/i18n/locales/en/shortcuts.json

@@ -0,0 +1,36 @@
+{
+	"title": "Keyboard Shortcuts",
+	"customize": "Customize",
+	"configurable": "Configurable",
+	"fixed": "Fixed",
+	"pressKey": "Press a key…",
+	"clickToChange": "Click to change",
+	"pressEscToCancel": "Press Esc to cancel",
+	"helpText": "Click a shortcut then press the new key combination. Press Esc to cancel.",
+	"resetToDefaults": "Reset to defaults",
+	"alreadyUsedBy": "Already used by {{action}}",
+	"swap": "Swap",
+	"reservedShortcut": "This shortcut is reserved for \"{{label}}\" and cannot be reassigned.",
+	"savedToast": "Keyboard shortcuts saved",
+	"resetToast": "Reset to default shortcuts — click Save to apply",
+	"actions": {
+		"addZoom": "Add Zoom",
+		"addTrim": "Add Trim",
+		"addSpeed": "Add Speed",
+		"addAnnotation": "Add Annotation",
+		"addKeyframe": "Add Keyframe",
+		"deleteSelected": "Delete Selected",
+		"playPause": "Play / Pause"
+	},
+	"fixedActions": {
+		"undo": "Undo",
+		"redo": "Redo",
+		"cycleAnnotationsForward": "Cycle Annotations Forward",
+		"cycleAnnotationsBackward": "Cycle Annotations Backward",
+		"deleteSelectedAlt": "Delete Selected (alt)",
+		"panTimeline": "Pan Timeline",
+		"zoomTimeline": "Zoom Timeline",
+		"frameBack": "Frame Back",
+		"frameForward": "Frame Forward"
+	}
+}

src/i18n/locales/en/timeline.json

@@ -0,0 +1,50 @@
+{
+	"buttons": {
+		"addZoom": "Add Zoom (Z)",
+		"suggestZooms": "Suggest Zooms from Cursor",
+		"addTrim": "Add Trim (T)",
+		"addAnnotation": "Add Annotation (A)",
+		"addSpeed": "Add Speed (S)"
+	},
+	"hints": {
+		"pressZoom": "Press Z to add zoom",
+		"pressTrim": "Press T to add trim",
+		"pressAnnotation": "Press A to add annotation",
+		"pressSpeed": "Press S to add speed"
+	},
+	"labels": {
+		"pan": "Pan",
+		"zoom": "Zoom",
+		"zoomItem": "Zoom {{index}}",
+		"trimItem": "Trim {{index}}",
+		"speedItem": "Speed {{index}}",
+		"annotationItem": "Annotation",
+		"imageItem": "Image",
+		"emptyText": "Empty text"
+	},
+	"emptyState": {
+		"noVideo": "No Video Loaded",
+		"dragAndDrop": "Drag and drop a video to start editing"
+	},
+	"errors": {
+		"cannotPlaceZoom": "Cannot place zoom here",
+		"zoomExistsAtLocation": "Zoom already exists at this location or not enough space available.",
+		"zoomSuggestionUnavailable": "Zoom suggestion handler unavailable",
+		"noCursorTelemetry": "No cursor telemetry available",
+		"noCursorTelemetryDescription": "Record a screencast first to generate cursor-based suggestions.",
+		"noUsableTelemetry": "No usable cursor telemetry",
+		"noUsableTelemetryDescription": "The recording does not include enough cursor movement data.",
+		"noDwellMoments": "No clear cursor dwell moments found",
+		"noDwellMomentsDescription": "Try a recording with slower cursor pauses on important actions.",
+		"noAutoZoomSlots": "No auto-zoom slots available",
+		"noAutoZoomSlotsDescription": "Detected dwell points overlap existing zoom regions.",
+		"cannotPlaceTrim": "Cannot place trim here",
+		"trimExistsAtLocation": "Trim already exists at this location or not enough space available.",
+		"cannotPlaceSpeed": "Cannot place speed here",
+		"speedExistsAtLocation": "Speed region already exists at this location or not enough space available."
+	},
+	"success": {
+		"addedZoomSuggestions": "Added {{count}} cursor-based zoom suggestion",
+		"addedZoomSuggestionsPlural": "Added {{count}} cursor-based zoom suggestions"
+	}
+}

src/i18n/locales/es/common.json

@@ -0,0 +1,29 @@
+{
+	"actions": {
+		"cancel": "Cancelar",
+		"save": "Guardar",
+		"delete": "Eliminar",
+		"close": "Cerrar",
+		"share": "Compartir",
+		"done": "Listo",
+		"open": "Abrir",
+		"upload": "Subir",
+		"export": "Exportar",
+		"file": "Archivo",
+		"edit": "Editar",
+		"view": "Vista",
+		"window": "Ventana",
+		"quit": "Salir",
+		"stopRecording": "Detener grabación"
+	},
+	"playback": {
+		"play": "Reproducir",
+		"pause": "Pausar",
+		"fullscreen": "Pantalla completa",
+		"exitFullscreen": "Salir de pantalla completa"
+	},
+	"locale": {
+		"name": "Español",
+		"short": "ES"
+	}
+}

src/i18n/locales/es/dialogs.json

@@ -0,0 +1,68 @@
+{
+	"export": {
+		"complete": "Exportación completada",
+		"yourFormatReady": "Tu {{format}} está listo",
+		"showInFolder": "Mostrar en carpeta",
+		"finalizingVideo": "Finalizando exportación de video...",
+		"compilingGifProgress": "Compilando GIF... {{progress}}%",
+		"compilingGifWait": "Compilando GIF... Esto puede tardar un rato",
+		"takeMoment": "Esto puede tardar un momento...",
+		"failed": "La exportación falló",
+		"tryAgain": "Por favor intenta de nuevo",
+		"finalizingVideoTitle": "Finalizando video",
+		"compilingGif": "Compilando GIF",
+		"exportingFormat": "Exportando {{format}}",
+		"compiling": "Compilando",
+		"renderingFrames": "Renderizando cuadros",
+		"processing": "Procesando...",
+		"finalizing": "Finalizando...",
+		"compilingStatus": "Compilando...",
+		"status": "Estado",
+		"format": "Formato",
+		"frames": "Cuadros",
+		"cancelExport": "Cancelar exportación",
+		"savedSuccessfully": "¡{{format}} guardado exitosamente!"
+	},
+	"tutorial": {
+		"triggerLabel": "Cómo funciona el recorte",
+		"title": "Cómo funciona el recorte",
+		"description": "Aprende a eliminar las partes no deseadas de tu video.",
+		"explanation": "La herramienta de recorte funciona definiendo los segmentos que deseas",
+		"explanationRemove": "eliminar",
+		"explanationCovered": "cubierto",
+		"explanationEnd": "por un segmento rojo de recorte será eliminado al exportar.",
+		"visualExample": "Ejemplo visual",
+		"removed": "ELIMINADO",
+		"kept": "Conservado",
+		"part1": "Parte 1",
+		"part2": "Parte 2",
+		"part3": "Parte 3",
+		"finalVideo": "Video final",
+		"step1Title": "1. Agregar recorte",
+		"step1Description": "Presiona T o haz clic en el ícono de tijeras para marcar una sección a eliminar.",
+		"step2Title": "2. Ajustar",
+		"step2Description": "Arrastra los bordes de la región roja para cubrir exactamente lo que deseas eliminar."
+	},
+	"unsavedChanges": {
+		"title": "Cambios sin guardar",
+		"message": "Tienes cambios sin guardar.",
+		"detail": "¿Deseas guardar tu proyecto antes de cerrar?",
+		"saveAndClose": "Guardar y cerrar",
+		"discardAndClose": "Descartar y cerrar",
+		"loadProject": "Cargar proyecto…",
+		"saveProject": "Guardar proyecto…",
+		"saveProjectAs": "Guardar proyecto como…"
+	},
+	"fileDialogs": {
+		"saveGif": "Guardar GIF exportado",
+		"saveVideo": "Guardar video exportado",
+		"selectVideo": "Seleccionar archivo de video",
+		"saveProject": "Guardar proyecto OpenScreen",
+		"openProject": "Abrir proyecto OpenScreen",
+		"gifImage": "Imagen GIF",
+		"mp4Video": "Video MP4",
+		"videoFiles": "Archivos de video",
+		"openscreenProject": "Proyecto OpenScreen",
+		"allFiles": "Todos los archivos"
+	}
+}

src/i18n/locales/es/editor.json

@@ -0,0 +1,35 @@
+{
+	"errors": {
+		"noVideoLoaded": "No hay video cargado",
+		"videoNotReady": "El video no está listo",
+		"unableToDetermineSourcePath": "No se pudo determinar la ruta del video de origen",
+		"failedToSaveGif": "Error al guardar el GIF",
+		"gifExportFailed": "La exportación de GIF falló",
+		"failedToSaveVideo": "Error al guardar el video",
+		"exportFailed": "La exportación falló",
+		"exportFailedWithError": "La exportación falló: {{error}}",
+		"failedToSaveExport": "Error al guardar la exportación",
+		"failedToSaveExportedVideo": "Error al guardar el video exportado",
+		"failedToRevealInFolder": "Error al mostrar en la carpeta: {{error}}"
+	},
+	"export": {
+		"canceled": "Exportación cancelada",
+		"exportedSuccessfully": "{{format}} exportado exitosamente"
+	},
+	"project": {
+		"saveCanceled": "Guardado de proyecto cancelado",
+		"failedToSave": "Error al guardar el proyecto",
+		"savedTo": "Proyecto guardado en {{path}}",
+		"failedToLoad": "Error al cargar el proyecto",
+		"invalidFormat": "Formato de archivo de proyecto no válido",
+		"loadedFrom": "Proyecto cargado desde {{path}}"
+	},
+	"recording": {
+		"failedCameraAccess": "Error al solicitar acceso a la cámara.",
+		"cameraBlocked": "El acceso a la cámara está bloqueado. Actívalo en la configuración del sistema para usar la cámara web.",
+		"systemAudioUnavailable": "Audio del sistema no disponible. Grabando sin audio del sistema.",
+		"microphoneDenied": "Acceso al micrófono denegado. La grabación continuará sin audio.",
+		"cameraDenied": "Acceso a la cámara denegado. La grabación continuará sin cámara web.",
+		"permissionDenied": "Permiso de grabación denegado. Por favor permite la grabación de pantalla."
+	}
+}

src/i18n/locales/es/launch.json

@@ -0,0 +1,37 @@
+{
+	"tooltips": {
+		"hideHUD": "Ocultar HUD",
+		"closeApp": "Cerrar aplicación",
+		"restartRecording": "Reiniciar grabación",
+		"cancelRecording": "Cancelar grabación",
+		"pauseRecording": "Pausar grabación",
+		"resumeRecording": "Reanudar grabación",
+		"openVideoFile": "Abrir archivo de video",
+		"openProject": "Abrir proyecto"
+	},
+	"audio": {
+		"enableSystemAudio": "Activar audio del sistema",
+		"disableSystemAudio": "Desactivar audio del sistema",
+		"enableMicrophone": "Activar micrófono",
+		"disableMicrophone": "Desactivar micrófono",
+		"defaultMicrophone": "Micrófono predeterminado"
+	},
+	"webcam": {
+		"enableWebcam": "Activar cámara web",
+		"disableWebcam": "Desactivar cámara web",
+		"defaultCamera": "Cámara predeterminada",
+		"searching": "Buscando...",
+		"noneFound": "No se encontró cámara",
+		"unavailable": "Cámara no disponible"
+	},
+	"sourceSelector": {
+		"loading": "Cargando fuentes...",
+		"screens": "Pantallas ({{count}})",
+		"windows": "Ventanas ({{count}})",
+		"defaultSourceName": "Pantalla"
+	},
+	"recording": {
+		"selectSource": "Por favor selecciona una fuente para grabar"
+	},
+	"language": "Idioma"
+}

src/i18n/locales/es/settings.json

@@ -0,0 +1,159 @@
+{
+	"zoom": {
+		"level": "Nivel de zoom",
+		"selectRegion": "Selecciona una región de zoom para ajustar",
+		"deleteZoom": "Eliminar zoom",
+		"focusMode": {
+			"title": "Modo de enfoque",
+			"manual": "Manual",
+			"auto": "Auto",
+			"autoDescription": "La cámara sigue la posición del cursor grabado"
+		}
+	},
+	"speed": {
+		"playbackSpeed": "Velocidad de reproducción",
+		"selectRegion": "Selecciona una región de velocidad para ajustar",
+		"deleteRegion": "Eliminar región de velocidad"
+	},
+	"trim": {
+		"deleteRegion": "Eliminar región de recorte"
+	},
+	"layout": {
+		"title": "Diseño",
+		"preset": "Predefinido",
+		"selectPreset": "Seleccionar predefinido",
+		"pictureInPicture": "Imagen en imagen",
+		"verticalStack": "Apilado vertical",
+		"webcamShape": "Forma de cámara"
+	},
+	"effects": {
+		"title": "Efectos de video",
+		"blurBg": "Desenfocar fondo",
+		"motionBlur": "Desenfoque de movimiento",
+		"off": "desactivado",
+		"shadow": "Sombra",
+		"roundness": "Redondez",
+		"padding": "Relleno"
+	},
+	"background": {
+		"title": "Fondo",
+		"image": "Imagen",
+		"color": "Color",
+		"gradient": "Degradado",
+		"uploadCustom": "Subir personalizado",
+		"gradientLabel": "Degradado {{index}}"
+	},
+	"crop": {
+		"title": "Recortar",
+		"cropVideo": "Recortar video",
+		"dragInstruction": "Arrastra cada lado para ajustar el área de recorte",
+		"ratio": "Proporción",
+		"free": "Libre",
+		"done": "Listo",
+		"lockAspectRatio": "Bloquear relación de aspecto",
+		"unlockAspectRatio": "Desbloquear relación de aspecto"
+	},
+	"exportFormat": {
+		"mp4": "MP4",
+		"gif": "GIF",
+		"mp4Video": "Video MP4",
+		"mp4Description": "Archivo de video de alta calidad",
+		"gifAnimation": "Animación GIF",
+		"gifDescription": "Imagen animada para compartir"
+	},
+	"exportQuality": {
+		"title": "Calidad de exportación",
+		"low": "Baja",
+		"medium": "Media",
+		"high": "Alta"
+	},
+	"gifSettings": {
+		"frameRate": "Velocidad de cuadros del GIF",
+		"size": "Tamaño del GIF",
+		"loop": "Repetir GIF"
+	},
+	"project": {
+		"save": "Guardar proyecto",
+		"load": "Cargar proyecto"
+	},
+	"export": {
+		"videoButton": "Exportar video",
+		"gifButton": "Exportar GIF",
+		"chooseSaveLocation": "Elegir ubicación de guardado"
+	},
+	"links": {
+		"reportBug": "Reportar error",
+		"starOnGithub": "Dar estrella en GitHub"
+	},
+	"imageUpload": {
+		"invalidFileType": "Tipo de archivo no válido",
+		"jpgOnly": "Por favor sube un archivo de imagen JPG o JPEG.",
+		"uploadSuccess": "¡Imagen personalizada subida exitosamente!",
+		"failedToUpload": "Error al subir la imagen",
+		"errorReading": "Hubo un error al leer el archivo."
+	},
+	"annotation": {
+		"title": "Configuración de anotaciones",
+		"active": "Activo",
+		"typeText": "Texto",
+		"typeImage": "Imagen",
+		"typeArrow": "Flecha",
+		"textContent": "Contenido de texto",
+		"textPlaceholder": "Escribe tu texto...",
+		"fontStyle": "Estilo de fuente",
+		"selectStyle": "Seleccionar estilo",
+		"size": "Tamaño",
+		"customFonts": "Fuentes personalizadas",
+		"textColor": "Color de texto",
+		"background": "Fondo",
+		"none": "Ninguno",
+		"color": "Color",
+		"clearBackground": "Quitar fondo",
+		"uploadImage": "Subir imagen",
+		"supportedFormats": "Formatos compatibles: JPG, PNG, GIF, WebP",
+		"arrowDirection": "Dirección de la flecha",
+		"strokeWidth": "Grosor del trazo: {{width}}px",
+		"arrowColor": "Color de la flecha",
+		"deleteAnnotation": "Eliminar anotación",
+		"shortcutsAndTips": "Atajos y consejos",
+		"tipMovePlayhead": "Mueve el cabezal de reproducción a la sección de anotación superpuesta y selecciona un elemento.",
+		"tipTabCycle": "Usa Tab para recorrer los elementos superpuestos.",
+		"tipShiftTabCycle": "Usa Shift+Tab para recorrer hacia atrás.",
+		"invalidImageType": "Tipo de archivo no válido",
+		"imageFormatsOnly": "Por favor sube un archivo de imagen JPG, PNG, GIF o WebP.",
+		"imageUploadSuccess": "¡Imagen subida exitosamente!",
+		"failedImageUpload": "Error al subir la imagen"
+	},
+	"fontStyles": {
+		"classic": "Clásico",
+		"editor": "Editor",
+		"strong": "Fuerte",
+		"typewriter": "Máquina de escribir",
+		"deco": "Deco",
+		"simple": "Simple",
+		"modern": "Moderno",
+		"clean": "Limpio"
+	},
+	"customFont": {
+		"dialogTitle": "Agregar fuente de Google",
+		"urlLabel": "URL de importación de Google Fonts",
+		"urlPlaceholder": "https://fonts.googleapis.com/css2?family=Roboto&display=swap",
+		"urlHelp": "Obtén esto de Google Fonts: Selecciona una fuente → Haz clic en \"Get font\" → Copia la URL de @import",
+		"nameLabel": "Nombre para mostrar",
+		"namePlaceholder": "Mi fuente personalizada",
+		"nameHelp": "Así aparecerá la fuente en el selector de fuentes",
+		"addButton": "Agregar fuente",
+		"addingButton": "Agregando...",
+		"errorEmptyUrl": "Por favor ingresa una URL de importación de Google Fonts",
+		"errorInvalidUrl": "Por favor ingresa una URL válida de Google Fonts",
+		"errorEmptyName": "Por favor ingresa un nombre de fuente",
+		"errorExtractFailed": "No se pudo extraer la familia de fuentes de la URL",
+		"successMessage": "Fuente \"{{fontName}}\" agregada exitosamente",
+		"failedToAdd": "Error al agregar la fuente",
+		"errorTimeout": "La fuente tardó demasiado en cargarse. Por favor verifica la URL e intenta de nuevo.",
+		"errorLoadFailed": "No se pudo cargar la fuente. Por favor verifica que la URL de Google Fonts sea correcta."
+	},
+	"language": {
+		"title": "Idioma"
+	}
+}

src/i18n/locales/es/shortcuts.json

@@ -0,0 +1,36 @@
+{
+	"title": "Atajos de teclado",
+	"customize": "Personalizar",
+	"configurable": "Configurables",
+	"fixed": "Fijos",
+	"pressKey": "Presiona una tecla…",
+	"clickToChange": "Haz clic para cambiar",
+	"pressEscToCancel": "Presiona Esc para cancelar",
+	"helpText": "Haz clic en un atajo y luego presiona la nueva combinación de teclas. Presiona Esc para cancelar.",
+	"resetToDefaults": "Restablecer valores predeterminados",
+	"alreadyUsedBy": "Ya está en uso por {{action}}",
+	"swap": "Intercambiar",
+	"reservedShortcut": "Este atajo está reservado para \"{{label}}\" y no se puede reasignar.",
+	"savedToast": "Atajos de teclado guardados",
+	"resetToast": "Restablecido a los atajos predeterminados — haz clic en Guardar para aplicar",
+	"actions": {
+		"addZoom": "Agregar zoom",
+		"addTrim": "Agregar recorte",
+		"addSpeed": "Agregar velocidad",
+		"addAnnotation": "Agregar anotación",
+		"addKeyframe": "Agregar fotograma clave",
+		"deleteSelected": "Eliminar seleccionado",
+		"playPause": "Reproducir / Pausar"
+	},
+	"fixedActions": {
+		"undo": "Deshacer",
+		"redo": "Rehacer",
+		"cycleAnnotationsForward": "Recorrer anotaciones hacia adelante",
+		"cycleAnnotationsBackward": "Recorrer anotaciones hacia atrás",
+		"deleteSelectedAlt": "Eliminar seleccionado (alt)",
+		"panTimeline": "Desplazar línea de tiempo",
+		"zoomTimeline": "Zoom en línea de tiempo",
+		"frameBack": "Fotograma anterior",
+		"frameForward": "Fotograma siguiente"
+	}
+}

src/i18n/locales/es/timeline.json

@@ -0,0 +1,50 @@
+{
+	"buttons": {
+		"addZoom": "Agregar zoom (Z)",
+		"suggestZooms": "Sugerir zooms desde el cursor",
+		"addTrim": "Agregar recorte (T)",
+		"addAnnotation": "Agregar anotación (A)",
+		"addSpeed": "Agregar velocidad (S)"
+	},
+	"hints": {
+		"pressZoom": "Presiona Z para agregar zoom",
+		"pressTrim": "Presiona T para agregar recorte",
+		"pressAnnotation": "Presiona A para agregar anotación",
+		"pressSpeed": "Presiona S para agregar velocidad"
+	},
+	"labels": {
+		"pan": "Desplazar",
+		"zoom": "Zoom",
+		"zoomItem": "Zoom {{index}}",
+		"trimItem": "Recorte {{index}}",
+		"speedItem": "Velocidad {{index}}",
+		"annotationItem": "Anotación",
+		"imageItem": "Imagen",
+		"emptyText": "Texto vacío"
+	},
+	"emptyState": {
+		"noVideo": "No hay video cargado",
+		"dragAndDrop": "Arrastra y suelta un video para comenzar a editar"
+	},
+	"errors": {
+		"cannotPlaceZoom": "No se puede colocar el zoom aquí",
+		"zoomExistsAtLocation": "Ya existe un zoom en esta ubicación o no hay suficiente espacio disponible.",
+		"zoomSuggestionUnavailable": "El controlador de sugerencias de zoom no está disponible",
+		"noCursorTelemetry": "No hay telemetría de cursor disponible",
+		"noCursorTelemetryDescription": "Graba una captura de pantalla primero para generar sugerencias basadas en el cursor.",
+		"noUsableTelemetry": "No hay telemetría de cursor utilizable",
+		"noUsableTelemetryDescription": "La grabación no incluye suficientes datos de movimiento del cursor.",
+		"noDwellMoments": "No se encontraron momentos claros de pausa del cursor",
+		"noDwellMomentsDescription": "Intenta una grabación con pausas más lentas del cursor en acciones importantes.",
+		"noAutoZoomSlots": "No hay espacios de auto-zoom disponibles",
+		"noAutoZoomSlotsDescription": "Los puntos de pausa detectados se superponen con regiones de zoom existentes.",
+		"cannotPlaceTrim": "No se puede colocar el recorte aquí",
+		"trimExistsAtLocation": "Ya existe un recorte en esta ubicación o no hay suficiente espacio disponible.",
+		"cannotPlaceSpeed": "No se puede colocar la velocidad aquí",
+		"speedExistsAtLocation": "Ya existe una región de velocidad en esta ubicación o no hay suficiente espacio disponible."
+	},
+	"success": {
+		"addedZoomSuggestions": "Se agregó {{count}} sugerencia de zoom basada en el cursor",
+		"addedZoomSuggestionsPlural": "Se agregaron {{count}} sugerencias de zoom basadas en el cursor"
+	}
+}

src/i18n/locales/zh-CN/common.json

@@ -0,0 +1,29 @@
+{
+	"actions": {
+		"cancel": "取消",
+		"save": "保存",
+		"delete": "删除",
+		"close": "关闭",
+		"share": "分享",
+		"done": "完成",
+		"open": "打开",
+		"upload": "上传",
+		"export": "导出",
+		"file": "文件",
+		"edit": "编辑",
+		"view": "视图",
+		"window": "窗口",
+		"quit": "退出",
+		"stopRecording": "停止录制"
+	},
+	"playback": {
+		"play": "播放",
+		"pause": "暂停",
+		"fullscreen": "全屏",
+		"exitFullscreen": "退出全屏"
+	},
+	"locale": {
+		"name": "中文",
+		"short": "中文"
+	}
+}

src/i18n/locales/zh-CN/dialogs.json

@@ -0,0 +1,68 @@
+{
+	"export": {
+		"complete": "导出完成",
+		"yourFormatReady": "您的 {{format}} 已准备就绪",
+		"showInFolder": "在文件夹中显示",
+		"finalizingVideo": "正在完成视频导出...",
+		"compilingGifProgress": "正在编译 GIF... {{progress}}%",
+		"compilingGifWait": "正在编译 GIF... 这可能需要一些时间",
+		"takeMoment": "这可能需要一点时间...",
+		"failed": "导出失败",
+		"tryAgain": "请重试",
+		"finalizingVideoTitle": "正在完成视频",
+		"compilingGif": "正在编译 GIF",
+		"exportingFormat": "正在导出 {{format}}",
+		"compiling": "编译中",
+		"renderingFrames": "渲染帧",
+		"processing": "处理中...",
+		"finalizing": "正在完成...",
+		"compilingStatus": "编译中...",
+		"status": "状态",
+		"format": "格式",
+		"frames": "帧",
+		"cancelExport": "取消导出",
+		"savedSuccessfully": "{{format}} 保存成功！"
+	},
+	"tutorial": {
+		"triggerLabel": "剪辑功能说明",
+		"title": "剪辑功能说明",
+		"description": "了解如何剪掉视频中不需要的部分。",
+		"explanation": "剪辑工具通过定义您要",
+		"explanationRemove": "移除",
+		"explanationCovered": "覆盖",
+		"explanationEnd": "的片段来工作。被红色剪辑区域覆盖的部分将在导出时被剪掉。",
+		"visualExample": "示例演示",
+		"removed": "已移除",
+		"kept": "保留",
+		"part1": "第 1 部分",
+		"part2": "第 2 部分",
+		"part3": "第 3 部分",
+		"finalVideo": "最终视频",
+		"step1Title": "1. 添加剪辑",
+		"step1Description": "按 T 或点击剪刀图标来标记要移除的片段。",
+		"step2Title": "2. 调整",
+		"step2Description": "拖动红色区域的边缘，精确覆盖您要剪掉的部分。"
+	},
+	"unsavedChanges": {
+		"title": "未保存的更改",
+		"message": "您有未保存的更改。",
+		"detail": "是否在关闭前保存项目？",
+		"saveAndClose": "保存并关闭",
+		"discardAndClose": "放弃并关闭",
+		"loadProject": "加载项目…",
+		"saveProject": "保存项目…",
+		"saveProjectAs": "项目另存为…"
+	},
+	"fileDialogs": {
+		"saveGif": "保存导出的 GIF",
+		"saveVideo": "保存导出的视频",
+		"selectVideo": "选择视频文件",
+		"saveProject": "保存 OpenScreen 项目",
+		"openProject": "打开 OpenScreen 项目",
+		"gifImage": "GIF 图片",
+		"mp4Video": "MP4 视频",
+		"videoFiles": "视频文件",
+		"openscreenProject": "OpenScreen 项目",
+		"allFiles": "所有文件"
+	}
+}

src/i18n/locales/zh-CN/editor.json

@@ -0,0 +1,35 @@
+{
+	"errors": {
+		"noVideoLoaded": "未加载视频",
+		"videoNotReady": "视频未就绪",
+		"unableToDetermineSourcePath": "无法确定源视频路径",
+		"failedToSaveGif": "保存 GIF 失败",
+		"gifExportFailed": "GIF 导出失败",
+		"failedToSaveVideo": "保存视频失败",
+		"exportFailed": "导出失败",
+		"exportFailedWithError": "导出失败：{{error}}",
+		"failedToSaveExport": "保存导出文件失败",
+		"failedToSaveExportedVideo": "保存导出的视频失败",
+		"failedToRevealInFolder": "在文件夹中显示时出错：{{error}}"
+	},
+	"export": {
+		"canceled": "导出已取消",
+		"exportedSuccessfully": "{{format}} 导出成功"
+	},
+	"project": {
+		"saveCanceled": "项目保存已取消",
+		"failedToSave": "保存项目失败",
+		"savedTo": "项目已保存至 {{path}}",
+		"failedToLoad": "加载项目失败",
+		"invalidFormat": "无效的项目文件格式",
+		"loadedFrom": "项目已从 {{path}} 加载"
+	},
+	"recording": {
+		"failedCameraAccess": "请求摄像头权限失败。",
+		"cameraBlocked": "摄像头权限已被阻止。请在系统设置中启用以使用摄像头。",
+		"systemAudioUnavailable": "系统音频不可用。将在无系统音频的情况下录制。",
+		"microphoneDenied": "麦克风权限被拒绝。录制将继续，但不包含音频。",
+		"cameraDenied": "摄像头权限被拒绝。录制将继续，但不包含摄像头画面。",
+		"permissionDenied": "录屏权限被拒绝。请允许屏幕录制。"
+	}
+}

src/i18n/locales/zh-CN/launch.json

@@ -0,0 +1,37 @@
+{
+	"tooltips": {
+		"hideHUD": "隐藏控制面板",
+		"closeApp": "关闭应用",
+		"restartRecording": "重新开始录制",
+		"cancelRecording": "取消录制",
+		"pauseRecording": "暂停录制",
+		"resumeRecording": "继续录制",
+		"openVideoFile": "打开视频文件",
+		"openProject": "打开项目"
+	},
+	"audio": {
+		"enableSystemAudio": "启用系统音频",
+		"disableSystemAudio": "禁用系统音频",
+		"enableMicrophone": "启用麦克风",
+		"disableMicrophone": "禁用麦克风",
+		"defaultMicrophone": "默认麦克风"
+	},
+	"webcam": {
+		"enableWebcam": "启用摄像头",
+		"disableWebcam": "禁用摄像头",
+		"defaultCamera": "默认摄像头",
+		"searching": "正在搜索...",
+		"noneFound": "未找到摄像头",
+		"unavailable": "摄像头不可用"
+	},
+	"sourceSelector": {
+		"loading": "正在加载源...",
+		"screens": "屏幕 ({{count}})",
+		"windows": "窗口 ({{count}})",
+		"defaultSourceName": "屏幕"
+	},
+	"recording": {
+		"selectSource": "请选择要录制的源"
+	},
+	"language": "语言"
+}

src/i18n/locales/zh-CN/settings.json

@@ -0,0 +1,159 @@
+{
+	"zoom": {
+		"level": "缩放级别",
+		"selectRegion": "选择要调整的缩放区域",
+		"deleteZoom": "删除缩放",
+		"focusMode": {
+			"title": "对焦模式",
+			"manual": "手动",
+			"auto": "自动",
+			"autoDescription": "摄像头跟随录制时的光标位置"
+		}
+	},
+	"speed": {
+		"playbackSpeed": "播放速度",
+		"selectRegion": "选择要调整的速度区域",
+		"deleteRegion": "删除速度区域"
+	},
+	"trim": {
+		"deleteRegion": "删除剪辑区域"
+	},
+	"layout": {
+		"title": "布局",
+		"preset": "预设",
+		"selectPreset": "选择预设",
+		"pictureInPicture": "画中画",
+		"verticalStack": "垂直堆叠",
+		"webcamShape": "摄像头形状"
+	},
+	"effects": {
+		"title": "视频效果",
+		"blurBg": "模糊背景",
+		"motionBlur": "运动模糊",
+		"off": "关",
+		"shadow": "阴影",
+		"roundness": "圆角",
+		"padding": "内边距"
+	},
+	"background": {
+		"title": "背景",
+		"image": "图片",
+		"color": "颜色",
+		"gradient": "渐变",
+		"uploadCustom": "上传自定义",
+		"gradientLabel": "渐变 {{index}}"
+	},
+	"crop": {
+		"title": "裁剪",
+		"cropVideo": "裁剪视频",
+		"dragInstruction": "拖动每一侧来调整裁剪区域",
+		"ratio": "比例",
+		"free": "自由",
+		"done": "完成",
+		"lockAspectRatio": "锁定宽高比",
+		"unlockAspectRatio": "解锁宽高比"
+	},
+	"exportFormat": {
+		"mp4": "MP4",
+		"gif": "GIF",
+		"mp4Video": "MP4 视频",
+		"mp4Description": "高质量视频文件",
+		"gifAnimation": "GIF 动画",
+		"gifDescription": "可分享的动态图片"
+	},
+	"exportQuality": {
+		"title": "导出质量",
+		"low": "低",
+		"medium": "中",
+		"high": "高"
+	},
+	"gifSettings": {
+		"frameRate": "GIF 帧率",
+		"size": "GIF 尺寸",
+		"loop": "循环 GIF"
+	},
+	"project": {
+		"save": "保存项目",
+		"load": "加载项目"
+	},
+	"export": {
+		"videoButton": "导出视频",
+		"gifButton": "导出 GIF",
+		"chooseSaveLocation": "选择保存位置"
+	},
+	"links": {
+		"reportBug": "报告错误",
+		"starOnGithub": "在 GitHub 上加星"
+	},
+	"imageUpload": {
+		"invalidFileType": "无效的文件类型",
+		"jpgOnly": "请上传 JPG 或 JPEG 格式的图片文件。",
+		"uploadSuccess": "自定义图片上传成功！",
+		"failedToUpload": "上传图片失败",
+		"errorReading": "读取文件时出错。"
+	},
+	"annotation": {
+		"title": "标注设置",
+		"active": "活动",
+		"typeText": "文本",
+		"typeImage": "图片",
+		"typeArrow": "箭头",
+		"textContent": "文本内容",
+		"textPlaceholder": "输入您的文本...",
+		"fontStyle": "字体样式",
+		"selectStyle": "选择样式",
+		"size": "大小",
+		"customFonts": "自定义字体",
+		"textColor": "文本颜色",
+		"background": "背景",
+		"none": "无",
+		"color": "颜色",
+		"clearBackground": "清除背景",
+		"uploadImage": "上传图片",
+		"supportedFormats": "支持的格式：JPG、PNG、GIF、WebP",
+		"arrowDirection": "箭头方向",
+		"strokeWidth": "描边宽度：{{width}}px",
+		"arrowColor": "箭头颜色",
+		"deleteAnnotation": "删除标注",
+		"shortcutsAndTips": "快捷键与提示",
+		"tipMovePlayhead": "将播放头移动到重叠的标注区域并选择一个项目。",
+		"tipTabCycle": "使用 Tab 键在重叠项目之间循环切换。",
+		"tipShiftTabCycle": "使用 Shift+Tab 反向循环切换。",
+		"invalidImageType": "无效的文件类型",
+		"imageFormatsOnly": "请上传 JPG、PNG、GIF 或 WebP 格式的图片文件。",
+		"imageUploadSuccess": "图片上传成功！",
+		"failedImageUpload": "上传图片失败"
+	},
+	"fontStyles": {
+		"classic": "经典",
+		"editor": "编辑器",
+		"strong": "粗体",
+		"typewriter": "打字机",
+		"deco": "装饰",
+		"simple": "简约",
+		"modern": "现代",
+		"clean": "简洁"
+	},
+	"customFont": {
+		"dialogTitle": "添加 Google 字体",
+		"urlLabel": "Google Fonts 导入 URL",
+		"urlPlaceholder": "https://fonts.googleapis.com/css2?family=Roboto&display=swap",
+		"urlHelp": "从 Google Fonts 获取：选择字体 → 点击 \"Get font\" → 复制 @import URL",
+		"nameLabel": "显示名称",
+		"namePlaceholder": "我的自定义字体",
+		"nameHelp": "这是字体在字体选择器中显示的名称",
+		"addButton": "添加字体",
+		"addingButton": "添加中...",
+		"errorEmptyUrl": "请输入 Google Fonts 导入 URL",
+		"errorInvalidUrl": "请输入有效的 Google Fonts URL",
+		"errorEmptyName": "请输入字体名称",
+		"errorExtractFailed": "无法从 URL 中提取字体系列",
+		"successMessage": "字体 \"{{fontName}}\" 添加成功",
+		"failedToAdd": "添加字体失败",
+		"errorTimeout": "字体加载时间过长。请检查 URL 并重试。",
+		"errorLoadFailed": "无法加载该字体。请确认 Google Fonts URL 是否正确。"
+	},
+	"language": {
+		"title": "语言"
+	}
+}

src/i18n/locales/zh-CN/shortcuts.json

@@ -0,0 +1,36 @@
+{
+	"title": "键盘快捷键",
+	"customize": "自定义",
+	"configurable": "可配置",
+	"fixed": "固定",
+	"pressKey": "请按下按键…",
+	"clickToChange": "点击以更改",
+	"pressEscToCancel": "按 Esc 取消",
+	"helpText": "点击一个快捷键，然后按下新的组合键。按 Esc 取消。",
+	"resetToDefaults": "恢复默认设置",
+	"alreadyUsedBy": "已被 \"{{action}}\" 使用",
+	"swap": "交换",
+	"reservedShortcut": "此快捷键已保留给 \"{{label}}\"，无法重新分配。",
+	"savedToast": "键盘快捷键已保存",
+	"resetToast": "已恢复默认快捷键 — 点击保存以应用",
+	"actions": {
+		"addZoom": "添加缩放",
+		"addTrim": "添加剪辑",
+		"addSpeed": "添加速度",
+		"addAnnotation": "添加标注",
+		"addKeyframe": "添加关键帧",
+		"deleteSelected": "删除所选",
+		"playPause": "播放 / 暂停"
+	},
+	"fixedActions": {
+		"undo": "撤销",
+		"redo": "重做",
+		"cycleAnnotationsForward": "向前切换标注",
+		"cycleAnnotationsBackward": "向后切换标注",
+		"deleteSelectedAlt": "删除所选（替代）",
+		"panTimeline": "平移时间轴",
+		"zoomTimeline": "缩放时间轴",
+		"frameBack": "上一帧",
+		"frameForward": "下一帧"
+	}
+}

src/i18n/locales/zh-CN/timeline.json

@@ -0,0 +1,50 @@
+{
+	"buttons": {
+		"addZoom": "添加缩放 (Z)",
+		"suggestZooms": "根据光标建议缩放",
+		"addTrim": "添加剪辑 (T)",
+		"addAnnotation": "添加标注 (A)",
+		"addSpeed": "添加速度 (S)"
+	},
+	"hints": {
+		"pressZoom": "按 Z 添加缩放",
+		"pressTrim": "按 T 添加剪辑",
+		"pressAnnotation": "按 A 添加标注",
+		"pressSpeed": "按 S 添加速度"
+	},
+	"labels": {
+		"pan": "平移",
+		"zoom": "缩放",
+		"zoomItem": "缩放 {{index}}",
+		"trimItem": "剪辑 {{index}}",
+		"speedItem": "速度 {{index}}",
+		"annotationItem": "标注",
+		"imageItem": "图片",
+		"emptyText": "空文本"
+	},
+	"emptyState": {
+		"noVideo": "未加载视频",
+		"dragAndDrop": "拖放视频以开始编辑"
+	},
+	"errors": {
+		"cannotPlaceZoom": "无法在此处放置缩放",
+		"zoomExistsAtLocation": "此位置已存在缩放或没有足够的空间。",
+		"zoomSuggestionUnavailable": "缩放建议处理器不可用",
+		"noCursorTelemetry": "无可用的光标遥测数据",
+		"noCursorTelemetryDescription": "请先录制一段屏幕录像以生成基于光标的建议。",
+		"noUsableTelemetry": "无可用的光标遥测数据",
+		"noUsableTelemetryDescription": "录制内容没有包含足够的光标移动数据。",
+		"noDwellMoments": "未找到明确的光标停留时刻",
+		"noDwellMomentsDescription": "请尝试在重要操作上进行较慢光标停留的录制。",
+		"noAutoZoomSlots": "无可用的自动缩放位置",
+		"noAutoZoomSlotsDescription": "检测到的停留点与现有缩放区域重叠。",
+		"cannotPlaceTrim": "无法在此处放置剪辑",
+		"trimExistsAtLocation": "此位置已存在剪辑或没有足够的空间。",
+		"cannotPlaceSpeed": "无法在此处放置速度",
+		"speedExistsAtLocation": "此位置已存在速度区域或没有足够的空间。"
+	},
+	"success": {
+		"addedZoomSuggestions": "已添加 {{count}} 个基于光标的缩放建议",
+		"addedZoomSuggestionsPlural": "已添加 {{count}} 个基于光标的缩放建议"
+	}
+}

src/lib/__tests__/frameStepNavigation.test.ts

@@ -0,0 +1,42 @@
+import { describe, expect, it } from "vitest";
+
+import { computeFrameStepTime, FRAME_DURATION_SEC } from "@/lib/frameStep";
+
+describe("computeFrameStepTime", () => {
+	const duration = 10;
+
+	it("moves forward by one frame from the middle", () => {
+		const result = computeFrameStepTime(5, duration, "forward");
+		expect(result).toBeCloseTo(5 + FRAME_DURATION_SEC, 10);
+	});
+
+	it("moves backward by one frame from the middle", () => {
+		const result = computeFrameStepTime(5, duration, "backward");
+		expect(result).toBeCloseTo(5 - FRAME_DURATION_SEC, 10);
+	});
+
+	it("clamps to 0 when stepping backward at the beginning", () => {
+		const result = computeFrameStepTime(0, duration, "backward");
+		expect(result).toBe(0);
+	});
+
+	it("clamps to 0 when stepping backward near the beginning", () => {
+		const result = computeFrameStepTime(FRAME_DURATION_SEC / 2, duration, "backward");
+		expect(result).toBe(0);
+	});
+
+	it("clamps to duration when stepping forward at the end", () => {
+		const result = computeFrameStepTime(duration, duration, "forward");
+		expect(result).toBe(duration);
+	});
+
+	it("clamps to duration when stepping forward near the end", () => {
+		const result = computeFrameStepTime(duration - FRAME_DURATION_SEC / 2, duration, "forward");
+		expect(result).toBe(duration);
+	});
+
+	it("handles duration of 0 gracefully", () => {
+		expect(computeFrameStepTime(0, 0, "forward")).toBe(0);
+		expect(computeFrameStepTime(0, 0, "backward")).toBe(0);
+	});
+});

src/lib/compositeLayout.test.ts

@@ -0,0 +1,124 @@
+import { describe, expect, it } from "vitest";
+import { computeCompositeLayout } from "./compositeLayout";
+
+describe("computeCompositeLayout", () => {
+	it("anchors the overlay in the lower-right corner", () => {
+		const layout = computeCompositeLayout({
+			canvasSize: { width: 1920, height: 1080 },
+			screenSize: { width: 1920, height: 1080 },
+			webcamSize: { width: 1280, height: 720 },
+		});
+
+		expect(layout).not.toBeNull();
+		expect(layout!.webcamRect).not.toBeNull();
+		expect(layout!.webcamRect!.x + layout!.webcamRect!.width).toBeLessThanOrEqual(1920);
+		expect(layout!.webcamRect!.y + layout!.webcamRect!.height).toBeLessThanOrEqual(1080);
+		expect(layout!.webcamRect!.x).toBeGreaterThan(1920 / 2);
+		expect(layout!.webcamRect!.y).toBeGreaterThan(1080 / 2);
+	});
+
+	it("keeps the overlay within the configured stage fraction while preserving aspect ratio", () => {
+		const layout = computeCompositeLayout({
+			canvasSize: { width: 1280, height: 720 },
+			screenSize: { width: 1280, height: 720 },
+			webcamSize: { width: 1920, height: 1080 },
+		});
+
+		expect(layout).not.toBeNull();
+		expect(layout!.webcamRect).not.toBeNull();
+		expect(layout!.webcamRect!.width).toBeLessThanOrEqual(Math.round(1280 * 0.18) + 1);
+		expect(layout!.webcamRect!.height).toBeLessThanOrEqual(Math.round(720 * 0.18) + 1);
+		expect(
+			Math.abs(layout!.webcamRect!.width * 1080 - layout!.webcamRect!.height * 1920),
+		).toBeLessThanOrEqual(1920);
+	});
+
+	it("uses cover-style full-width stacking in vertical stack mode", () => {
+		const layout = computeCompositeLayout({
+			canvasSize: { width: 1920, height: 1080 },
+			maxContentSize: { width: 1536, height: 864 },
+			screenSize: { width: 1920, height: 1080 },
+			webcamSize: { width: 1280, height: 720 },
+			layoutPreset: "vertical-stack",
+		});
+
+		expect(layout).not.toBeNull();
+		expect(layout?.screenRect).toEqual({
+			x: 0,
+			y: 0,
+			width: 1920,
+			height: 0,
+		});
+		expect(layout?.webcamRect).toEqual({
+			x: 0,
+			y: 0,
+			width: 1920,
+			height: 1080,
+			borderRadius: 0,
+		});
+		expect(layout?.screenCover).toBe(true);
+	});
+
+	it("fills the canvas with the screen when vertical stack has no webcam", () => {
+		const layout = computeCompositeLayout({
+			canvasSize: { width: 1920, height: 1080 },
+			maxContentSize: { width: 1536, height: 864 },
+			screenSize: { width: 1920, height: 1080 },
+			layoutPreset: "vertical-stack",
+		});
+
+		expect(layout).not.toBeNull();
+		expect(layout?.screenRect).toEqual({
+			x: 0,
+			y: 0,
+			width: 1920,
+			height: 1080,
+		});
+		expect(layout?.webcamRect).toBeNull();
+		expect(layout?.screenCover).toBe(true);
+	});
+
+	it("forces circular and square masks to use square dimensions", () => {
+		const circularLayout = computeCompositeLayout({
+			canvasSize: { width: 1920, height: 1080 },
+			screenSize: { width: 1920, height: 1080 },
+			webcamSize: { width: 1280, height: 720 },
+			webcamMaskShape: "circle",
+		});
+		const squareLayout = computeCompositeLayout({
+			canvasSize: { width: 1920, height: 1080 },
+			screenSize: { width: 1920, height: 1080 },
+			webcamSize: { width: 1280, height: 720 },
+			webcamMaskShape: "square",
+		});
+
+		expect(circularLayout?.webcamRect).not.toBeNull();
+		expect(squareLayout?.webcamRect).not.toBeNull();
+		expect(circularLayout?.webcamRect?.width).toBe(circularLayout?.webcamRect?.height);
+		expect(squareLayout?.webcamRect?.width).toBe(squareLayout?.webcamRect?.height);
+		expect(circularLayout?.webcamRect?.maskShape).toBe("circle");
+		expect(squareLayout?.webcamRect?.maskShape).toBe("square");
+	});
+
+	it("applies larger rounding for the rounded webcam mask", () => {
+		const roundedLayout = computeCompositeLayout({
+			canvasSize: { width: 1920, height: 1080 },
+			screenSize: { width: 1920, height: 1080 },
+			webcamSize: { width: 1280, height: 720 },
+			webcamMaskShape: "rounded",
+		});
+		const rectangleLayout = computeCompositeLayout({
+			canvasSize: { width: 1920, height: 1080 },
+			screenSize: { width: 1920, height: 1080 },
+			webcamSize: { width: 1280, height: 720 },
+			webcamMaskShape: "rectangle",
+		});
+
+		expect(roundedLayout?.webcamRect).not.toBeNull();
+		expect(rectangleLayout?.webcamRect).not.toBeNull();
+		expect(roundedLayout?.webcamRect?.borderRadius).toBeGreaterThan(
+			rectangleLayout?.webcamRect?.borderRadius ?? 0,
+		);
+		expect(roundedLayout?.webcamRect?.maskShape).toBe("rounded");
+	});
+});

src/lib/compositeLayout.ts

@@ -0,0 +1,274 @@
+export interface RenderRect {
+	x: number;
+	y: number;
+	width: number;
+	height: number;
+}
+
+export interface StyledRenderRect extends RenderRect {
+	borderRadius: number;
+	maskShape?: import("@/components/video-editor/types").WebcamMaskShape;
+}
+
+export interface Size {
+	width: number;
+	height: number;
+}
+
+export type WebcamLayoutPreset = "picture-in-picture" | "vertical-stack";
+
+export interface WebcamLayoutShadow {
+	color: string;
+	blur: number;
+	offsetX: number;
+	offsetY: number;
+}
+
+interface BorderRadiusRule {
+	max: number;
+	min: number;
+	fraction: number;
+}
+
+interface OverlayTransform {
+	type: "overlay";
+	maxStageFraction: number;
+	marginFraction: number;
+	minMargin: number;
+	minSize: number;
+}
+
+interface StackTransform {
+	type: "stack";
+	gap: number;
+}
+
+export interface WebcamLayoutPresetDefinition {
+	label: string;
+	transform: OverlayTransform | StackTransform;
+	borderRadius: BorderRadiusRule;
+	shadow: WebcamLayoutShadow | null;
+}
+
+export interface WebcamCompositeLayout {
+	screenRect: RenderRect;
+	webcamRect: StyledRenderRect | null;
+	/** When true, the video should be scaled to cover screenRect (cropping overflow). */
+	screenCover?: boolean;
+}
+
+const MAX_STAGE_FRACTION = 0.18;
+const MARGIN_FRACTION = 0.02;
+const MAX_BORDER_RADIUS = 24;
+const WEBCAM_LAYOUT_PRESET_MAP: Record<WebcamLayoutPreset, WebcamLayoutPresetDefinition> = {
+	"picture-in-picture": {
+		label: "Picture in Picture",
+		transform: {
+			type: "overlay",
+			maxStageFraction: MAX_STAGE_FRACTION,
+			marginFraction: MARGIN_FRACTION,
+			minMargin: 0,
+			minSize: 0,
+		},
+		borderRadius: {
+			max: MAX_BORDER_RADIUS,
+			min: 12,
+			fraction: 0.12,
+		},
+		shadow: {
+			color: "rgba(0,0,0,0.35)",
+			blur: 24,
+			offsetX: 0,
+			offsetY: 10,
+		},
+	},
+	"vertical-stack": {
+		label: "Vertical Stack",
+		transform: {
+			type: "stack",
+			gap: 0,
+		},
+		borderRadius: {
+			max: 0,
+			min: 0,
+			fraction: 0,
+		},
+		shadow: null,
+	},
+};
+
+export const WEBCAM_LAYOUT_PRESETS = Object.entries(WEBCAM_LAYOUT_PRESET_MAP).map(
+	([value, preset]) => ({
+		value: value as WebcamLayoutPreset,
+		label: preset.label,
+	}),
+);
+
+export function getWebcamLayoutPresetDefinition(
+	preset: WebcamLayoutPreset = "picture-in-picture",
+): WebcamLayoutPresetDefinition {
+	return WEBCAM_LAYOUT_PRESET_MAP[preset];
+}
+
+export function getWebcamLayoutCssBoxShadow(
+	preset: WebcamLayoutPreset = "picture-in-picture",
+): string {
+	const shadow = getWebcamLayoutPresetDefinition(preset).shadow;
+	return shadow
+		? `${shadow.offsetX}px ${shadow.offsetY}px ${shadow.blur}px ${shadow.color}`
+		: "none";
+}
+
+export function computeCompositeLayout(params: {
+	canvasSize: Size;
+	maxContentSize?: Size;
+	screenSize: Size;
+	webcamSize?: Size | null;
+	layoutPreset?: WebcamLayoutPreset;
+	webcamPosition?: { cx: number; cy: number } | null;
+	webcamMaskShape?: import("@/components/video-editor/types").WebcamMaskShape;
+}): WebcamCompositeLayout | null {
+	const {
+		canvasSize,
+		maxContentSize = canvasSize,
+		screenSize,
+		webcamSize,
+		layoutPreset = "picture-in-picture",
+		webcamPosition,
+		webcamMaskShape = "rectangle",
+	} = params;
+	const { width: canvasWidth, height: canvasHeight } = canvasSize;
+	const { width: screenWidth, height: screenHeight } = screenSize;
+	const webcamWidth = webcamSize?.width;
+	const webcamHeight = webcamSize?.height;
+	const preset = getWebcamLayoutPresetDefinition(layoutPreset);
+
+	if (canvasWidth <= 0 || canvasHeight <= 0 || screenWidth <= 0 || screenHeight <= 0) {
+		return null;
+	}
+
+	if (preset.transform.type === "stack") {
+		if (!webcamWidth || !webcamHeight || webcamWidth <= 0 || webcamHeight <= 0) {
+			// No webcam — screen fills the entire canvas (cover mode)
+			return {
+				screenRect: { x: 0, y: 0, width: canvasWidth, height: canvasHeight },
+				webcamRect: null,
+				screenCover: true,
+			};
+		}
+
+		// Webcam: full width at the bottom, maintaining its aspect ratio
+		const webcamAspect = webcamWidth / webcamHeight;
+		const resolvedWebcamWidth = canvasWidth;
+		const resolvedWebcamHeight = Math.round(canvasWidth / webcamAspect);
+
+		// Screen: fills remaining space at the top (cover mode — may crop sides)
+		const screenRectHeight = canvasHeight - resolvedWebcamHeight;
+
+		return {
+			screenRect: {
+				x: 0,
+				y: 0,
+				width: canvasWidth,
+				height: Math.max(0, screenRectHeight),
+			},
+			webcamRect: {
+				x: 0,
+				y: Math.max(0, screenRectHeight),
+				width: resolvedWebcamWidth,
+				height: resolvedWebcamHeight,
+				borderRadius: 0,
+			},
+			screenCover: true,
+		};
+	}
+
+	const transform = preset.transform;
+	const screenRect = centerRect({
+		canvasSize,
+		size: screenSize,
+		maxSize: maxContentSize,
+	});
+
+	if (!webcamWidth || !webcamHeight || webcamWidth <= 0 || webcamHeight <= 0) {
+		return { screenRect, webcamRect: null };
+	}
+
+	const margin = Math.max(
+		transform.minMargin,
+		Math.round(Math.min(canvasWidth, canvasHeight) * transform.marginFraction),
+	);
+	const maxWidth = Math.max(transform.minSize, canvasWidth * transform.maxStageFraction);
+	const maxHeight = Math.max(transform.minSize, canvasHeight * transform.maxStageFraction);
+	const scale = Math.min(maxWidth / webcamWidth, maxHeight / webcamHeight);
+	let width = Math.round(webcamWidth * scale);
+	let height = Math.round(webcamHeight * scale);
+
+	// Shape-specific dimension adjustments
+	if (webcamMaskShape === "circle" || webcamMaskShape === "square") {
+		const side = Math.min(width, height);
+		width = side;
+		height = side;
+	}
+
+	let webcamX: number;
+	let webcamY: number;
+
+	if (webcamPosition) {
+		// Custom position: cx/cy represent the center of the webcam as a fraction of the canvas
+		webcamX = Math.round(webcamPosition.cx * canvasWidth - width / 2);
+		webcamY = Math.round(webcamPosition.cy * canvasHeight - height / 2);
+		// Clamp to stay within canvas bounds
+		webcamX = Math.max(0, Math.min(canvasWidth - width, webcamX));
+		webcamY = Math.max(0, Math.min(canvasHeight - height, webcamY));
+	} else {
+		// Default: bottom-right with margin
+		webcamX = Math.max(0, Math.round(canvasWidth - margin - width));
+		webcamY = Math.max(0, Math.round(canvasHeight - margin - height));
+	}
+
+	// Shape-specific border radius
+	let borderRadius: number;
+	if (webcamMaskShape === "rounded") {
+		borderRadius = Math.round(Math.min(width, height) * 0.3);
+	} else if (webcamMaskShape === "circle") {
+		borderRadius = Math.round(Math.min(width, height) / 2);
+	} else {
+		borderRadius = Math.min(
+			preset.borderRadius.max,
+			Math.max(
+				preset.borderRadius.min,
+				Math.round(Math.min(width, height) * preset.borderRadius.fraction),
+			),
+		);
+	}
+
+	return {
+		screenRect,
+		webcamRect: {
+			x: webcamX,
+			y: webcamY,
+			width,
+			height,
+			borderRadius,
+			maskShape: webcamMaskShape,
+		},
+	};
+}
+
+function centerRect(params: { canvasSize: Size; size: Size; maxSize: Size }): RenderRect {
+	const { canvasSize, size, maxSize } = params;
+	const { width: canvasWidth, height: canvasHeight } = canvasSize;
+	const { width, height } = size;
+	const { width: maxWidth, height: maxHeight } = maxSize;
+	const scale = Math.min(maxWidth / width, maxHeight / height, 1);
+	const resolvedWidth = Math.round(width * scale);
+	const resolvedHeight = Math.round(height * scale);
+
+	return {
+		x: Math.max(0, Math.floor((canvasWidth - resolvedWidth) / 2)),
+		y: Math.max(0, Math.floor((canvasHeight - resolvedHeight) / 2)),
+		width: resolvedWidth,
+		height: resolvedHeight,
+	};
+}

src/lib/exporter/frameRenderer.ts

@@ -12,15 +12,23 @@ import type {
 	AnnotationRegion,
 	CropRegion,
 	SpeedRegion,
+	WebcamLayoutPreset,
 	ZoomDepth,
 	ZoomRegion,
 } from "@/components/video-editor/types";
 import { ZOOM_DEPTH_SCALES } from "@/components/video-editor/types";
 import {
+	AUTO_FOLLOW_RAMP_DISTANCE,
+	AUTO_FOLLOW_SMOOTHING_FACTOR,
+	AUTO_FOLLOW_SMOOTHING_FACTOR_MAX,
 	DEFAULT_FOCUS,
 	ZOOM_SCALE_DEADZONE,
 	ZOOM_TRANSLATION_DEADZONE_PX,
 } from "@/components/video-editor/videoPlayback/constants";
+import {
+	adaptiveSmoothFactor,
+	smoothCursorFocus,
+} from "@/components/video-editor/videoPlayback/cursorFollowUtils";
 import { clampFocusToStage as clampFocusToStageUtil } from "@/components/video-editor/videoPlayback/focusUtils";
 import { findDominantRegion } from "@/components/video-editor/videoPlayback/zoomRegionUtils";
 import {
@@ -30,8 +38,20 @@ import {
 	createMotionBlurState,
 	type MotionBlurState,
 } from "@/components/video-editor/videoPlayback/zoomTransform";
-import { computeWebcamOverlayLayout } from "@/lib/webcamOverlay";
+import {
+	computeCompositeLayout,
+	getWebcamLayoutPresetDefinition,
+	type Size,
+	type StyledRenderRect,
+} from "@/lib/compositeLayout";
+import { drawCanvasClipPath } from "@/lib/webcamMaskShapes";
 import { renderAnnotations } from "./annotationRenderer";
+import {
+	getLinearGradientPoints,
+	getRadialGradientShape,
+	parseCssGradient,
+	resolveLinearGradientAngle,
+} from "./gradientParser";
 
 interface FrameRenderConfig {
 	width: number;
@@ -47,12 +67,15 @@ interface FrameRenderConfig {
 	cropRegion: CropRegion;
 	videoWidth: number;
 	videoHeight: number;
-	webcamWidth?: number;
-	webcamHeight?: number;
+	webcamSize?: Size | null;
+	webcamLayoutPreset?: WebcamLayoutPreset;
+	webcamMaskShape?: import("@/components/video-editor/types").WebcamMaskShape;
+	webcamPosition?: { cx: number; cy: number } | null;
 	annotationRegions?: AnnotationRegion[];
 	speedRegions?: SpeedRegion[];
 	previewWidth?: number;
 	previewHeight?: number;
+	cursorTelemetry?: import("@/components/video-editor/types").CursorTelemetryPoint[];
 }
 
 interface AnimationState {
@@ -71,6 +94,7 @@ interface LayoutCache {
 	baseScale: number;
 	baseOffset: { x: number; y: number };
 	maskRect: { x: number; y: number; width: number; height: number };
+	webcamRect: StyledRenderRect | null;
 }
 
 // Renders video frames with all effects (background, zoom, crop, blur, shadow) to an offscreen canvas for export.
@@ -93,6 +117,9 @@ export class FrameRenderer {
 	private layoutCache: LayoutCache | null = null;
 	private currentVideoTime = 0;
 	private motionBlurState: MotionBlurState = createMotionBlurState();
+	private smoothedAutoFocus: { cx: number; cy: number } | null = null;
+	private prevAnimationTimeMs: number | null = null;
+	private prevTargetProgress = 0;
 
 	constructor(config: FrameRenderConfig) {
 		this.config = config;
@@ -156,7 +183,9 @@ export class FrameRenderer {
 		this.compositeCanvas = document.createElement("canvas");
 		this.compositeCanvas.width = this.config.width;
 		this.compositeCanvas.height = this.config.height;
-		this.compositeCtx = this.compositeCanvas.getContext("2d", { willReadFrequently: false });
+		this.compositeCtx = this.compositeCanvas.getContext("2d", {
+			willReadFrequently: false,
+		});
 
 		if (!this.compositeCtx) {
 			throw new Error("Failed to get 2D context for composite canvas");
@@ -167,7 +196,9 @@ export class FrameRenderer {
 			this.shadowCanvas = document.createElement("canvas");
 			this.shadowCanvas.width = this.config.width;
 			this.shadowCanvas.height = this.config.height;
-			this.shadowCtx = this.shadowCanvas.getContext("2d", { willReadFrequently: false });
+			this.shadowCtx = this.shadowCanvas.getContext("2d", {
+				willReadFrequently: false,
+			});
 
 			if (!this.shadowCtx) {
 				throw new Error("Failed to get 2D context for shadow canvas");
@@ -248,40 +279,39 @@ export class FrameRenderer {
 				wallpaper.startsWith("linear-gradient") ||
 				wallpaper.startsWith("radial-gradient")
 			) {
-				const gradientMatch = wallpaper.match(/(linear|radial)-gradient\((.+)\)/);
-				if (gradientMatch) {
-					const [, type, params] = gradientMatch;
-					const parts = params.split(",").map((s) => s.trim());
+				const parsedGradient = parseCssGradient(wallpaper);
+				if (parsedGradient) {
+					const gradient =
+						parsedGradient.type === "linear"
+							? (() => {
+									const points = getLinearGradientPoints(
+										resolveLinearGradientAngle(parsedGradient.descriptor),
+										this.config.width,
+										this.config.height,
+									);
 
-					let gradient: CanvasGradient;
+									return bgCtx.createLinearGradient(points.x0, points.y0, points.x1, points.y1);
+								})()
+							: (() => {
+									const shape = getRadialGradientShape(
+										parsedGradient.descriptor,
+										this.config.width,
+										this.config.height,
+									);
 
-					if (type === "linear") {
-						gradient = bgCtx.createLinearGradient(0, 0, 0, this.config.height);
-						parts.forEach((part, index) => {
-							if (part.startsWith("to ") || part.includes("deg")) return;
+									return bgCtx.createRadialGradient(
+										shape.cx,
+										shape.cy,
+										0,
+										shape.cx,
+										shape.cy,
+										shape.radius,
+									);
+								})();
 
-							const colorMatch = part.match(/^(#[0-9a-fA-F]{3,8}|rgba?\([^)]+\)|[a-z]+)/);
-							if (colorMatch) {
-								const color = colorMatch[1];
-								const position = index / (parts.length - 1);
-								gradient.addColorStop(position, color);
-							}
-						});
-					} else {
-						const cx = this.config.width / 2;
-						const cy = this.config.height / 2;
-						const radius = Math.max(this.config.width, this.config.height) / 2;
-						gradient = bgCtx.createRadialGradient(cx, cy, 0, cx, cy, radius);
-
-						parts.forEach((part, index) => {
-							const colorMatch = part.match(/^(#[0-9a-fA-F]{3,8}|rgba?\([^)]+\)|[a-z]+)/);
-							if (colorMatch) {
-								const color = colorMatch[1];
-								const position = index / (parts.length - 1);
-								gradient.addColorStop(position, color);
-							}
-						});
-					}
+					parsedGradient.stops.forEach((stop) => {
+						gradient.addColorStop(stop.offset, stop.color);
+					});
 
 					bgCtx.fillStyle = gradient;
 					bgCtx.fillRect(0, 0, this.config.width, this.config.height);
@@ -329,7 +359,7 @@ export class FrameRenderer {
 		}
 
 		// Apply layout
-		this.updateLayout();
+		this.updateLayout(webcamFrame);
 
 		const timeMs = this.currentVideoTime * 1000;
 		const TICKS_PER_FRAME = 1;
@@ -393,7 +423,7 @@ export class FrameRenderer {
 		}
 	}
 
-	private updateLayout(): void {
+	private updateLayout(webcamFrame?: VideoFrame | null): void {
 		if (!this.app || !this.videoSprite || !this.maskGraphics || !this.videoContainer) return;
 
 		const { width, height } = this.config;
@@ -412,42 +442,62 @@ export class FrameRenderer {
 
 		// Calculate scale to fit in viewport
 		// Padding is a percentage (0-100), where 50% ~ 0.8 scale
-		const paddingScale = 1.0 - (padding / 100) * 0.4;
+		// Vertical stack ignores padding — it's full-bleed
+		const effectivePadding = this.config.webcamLayoutPreset === "vertical-stack" ? 0 : padding;
+		const paddingScale = 1.0 - (effectivePadding / 100) * 0.4;
 		const viewportWidth = width * paddingScale;
 		const viewportHeight = height * paddingScale;
-		const scale = Math.min(viewportWidth / croppedVideoWidth, viewportHeight / croppedVideoHeight);
+		const compositeLayout = computeCompositeLayout({
+			canvasSize: { width, height },
+			maxContentSize: { width: viewportWidth, height: viewportHeight },
+			screenSize: { width: croppedVideoWidth, height: croppedVideoHeight },
+			webcamSize: webcamFrame ? this.config.webcamSize : null,
+			layoutPreset: this.config.webcamLayoutPreset,
+			webcamPosition: this.config.webcamPosition,
+			webcamMaskShape: this.config.webcamMaskShape,
+		});
+		if (!compositeLayout) return;
+
+		const screenRect = compositeLayout.screenRect;
+
+		// Cover mode: scale to fill the rect (may crop), otherwise fit-to-width
+		let scale: number;
+		if (compositeLayout.screenCover) {
+			scale = Math.max(
+				screenRect.width / croppedVideoWidth,
+				screenRect.height / croppedVideoHeight,
+			);
+		} else {
+			scale = screenRect.width / croppedVideoWidth;
+		}
 
 		// Position video sprite
 		this.videoSprite.width = videoWidth * scale;
 		this.videoSprite.height = videoHeight * scale;
 
-		const cropPixelX = cropStartX * videoWidth * scale;
-		const cropPixelY = cropStartY * videoHeight * scale;
-		this.videoSprite.x = -cropPixelX;
-		this.videoSprite.y = -cropPixelY;
-
-		// Position video container
+		// Center the cropped region within the screenRect
 		const croppedDisplayWidth = croppedVideoWidth * scale;
 		const croppedDisplayHeight = croppedVideoHeight * scale;
-		const centerOffsetX = (width - croppedDisplayWidth) / 2;
-		const centerOffsetY = (height - croppedDisplayHeight) / 2;
-		this.videoContainer.x = centerOffsetX;
-		this.videoContainer.y = centerOffsetY;
+		const coverOffsetX = (screenRect.width - croppedDisplayWidth) / 2;
+		const coverOffsetY = (screenRect.height - croppedDisplayHeight) / 2;
+
+		const cropPixelX = cropStartX * videoWidth * scale;
+		const cropPixelY = cropStartY * videoHeight * scale;
+		this.videoSprite.x = -cropPixelX + coverOffsetX;
+		this.videoSprite.y = -cropPixelY + coverOffsetY;
+
+		// Position video container
+		this.videoContainer.x = screenRect.x;
+		this.videoContainer.y = screenRect.y;
 
 		// scale border radius by export/preview canvas ratio
 		const previewWidth = this.config.previewWidth || 1920;
 		const previewHeight = this.config.previewHeight || 1080;
 		const canvasScaleFactor = Math.min(width / previewWidth, height / previewHeight);
-		const scaledBorderRadius = borderRadius * canvasScaleFactor;
+		const scaledBorderRadius = compositeLayout.screenCover ? 0 : borderRadius * canvasScaleFactor;
 
 		this.maskGraphics.clear();
-		this.maskGraphics.roundRect(
-			0,
-			0,
-			croppedDisplayWidth,
-			croppedDisplayHeight,
-			scaledBorderRadius,
-		);
+		this.maskGraphics.roundRect(0, 0, screenRect.width, screenRect.height, scaledBorderRadius);
 		this.maskGraphics.fill({ color: 0xffffff });
 
 		// Cache layout info
@@ -455,8 +505,9 @@ export class FrameRenderer {
 			stageSize: { width, height },
 			videoSize: { width: croppedVideoWidth, height: croppedVideoHeight },
 			baseScale: scale,
-			baseOffset: { x: centerOffsetX, y: centerOffsetY },
-			maskRect: { x: 0, y: 0, width: croppedDisplayWidth, height: croppedDisplayHeight },
+			baseOffset: { x: compositeLayout.screenRect.x, y: compositeLayout.screenRect.y },
+			maskRect: compositeLayout.screenRect,
+			webcamRect: compositeLayout.webcamRect,
 		};
 	}
 
@@ -471,10 +522,16 @@ export class FrameRenderer {
 	private updateAnimationState(timeMs: number): number {
 		if (!this.cameraContainer || !this.layoutCache) return 0;
 
+		const bmEx = this.layoutCache.maskRect;
+		const ssEx = this.layoutCache.stageSize;
+		const viewportRatio =
+			bmEx.width > 0 && bmEx.height > 0
+				? { widthRatio: ssEx.width / bmEx.width, heightRatio: ssEx.height / bmEx.height }
+				: undefined;
 		const { region, strength, blendedScale, transition } = findDominantRegion(
 			this.config.zoomRegions,
 			timeMs,
-			{ connectZooms: true },
+			{ connectZooms: true, cursorTelemetry: this.config.cursorTelemetry, viewportRatio },
 		);
 
 		const defaultFocus = DEFAULT_FOCUS;
@@ -490,6 +547,50 @@ export class FrameRenderer {
 			targetFocus = regionFocus;
 			targetProgress = strength;
 
+			// Apply adaptive smoothing for auto-follow mode
+			if (region.focusMode === "auto" && !transition) {
+				const raw = targetFocus;
+				const dtMs = this.prevAnimationTimeMs != null ? timeMs - this.prevAnimationTimeMs : 0;
+				const framesElapsed = dtMs > 0 ? dtMs / (1000 / 60) : 1;
+				const isZoomingIn = targetProgress < 0.999 && targetProgress >= this.prevTargetProgress;
+				if (targetProgress >= 0.999) {
+					// Full zoom: adaptive smoothing — moves faster when far, decelerates when close
+					const prev = this.smoothedAutoFocus ?? raw;
+					const baseFactor = adaptiveSmoothFactor(
+						raw,
+						prev,
+						AUTO_FOLLOW_SMOOTHING_FACTOR,
+						AUTO_FOLLOW_SMOOTHING_FACTOR_MAX,
+						AUTO_FOLLOW_RAMP_DISTANCE,
+					);
+					const factor = 1 - Math.pow(1 - baseFactor, Math.max(1, framesElapsed));
+					const smoothed = smoothCursorFocus(raw, prev, factor);
+					this.smoothedAutoFocus = smoothed;
+					targetFocus = smoothed;
+				} else if (isZoomingIn) {
+					// Zoom-in: track cursor directly so zoom always aims at current cursor
+					// position; keep ref in sync to avoid snap when full-zoom begins
+					this.smoothedAutoFocus = raw;
+				} else {
+					// Zoom-out: keep smoothing for continuity — avoids snap at zoom-out start
+					const prev = this.smoothedAutoFocus ?? raw;
+					const baseFactor = adaptiveSmoothFactor(
+						raw,
+						prev,
+						AUTO_FOLLOW_SMOOTHING_FACTOR,
+						AUTO_FOLLOW_SMOOTHING_FACTOR_MAX,
+						AUTO_FOLLOW_RAMP_DISTANCE,
+					);
+					const factor = 1 - Math.pow(1 - baseFactor, Math.max(1, framesElapsed));
+					const smoothed = smoothCursorFocus(raw, prev, factor);
+					this.smoothedAutoFocus = smoothed;
+					targetFocus = smoothed;
+				}
+			} else if (region.focusMode !== "auto") {
+				this.smoothedAutoFocus = null;
+			}
+			this.prevTargetProgress = targetProgress;
+
 			if (transition) {
 				const startTransform = computeZoomTransform({
 					stageSize: this.layoutCache.stageSize,
@@ -565,6 +666,8 @@ export class FrameRenderer {
 		state.y = appliedY;
 		state.appliedScale = appliedScale;
 
+		this.prevAnimationTimeMs = timeMs;
+
 		return Math.max(
 			Math.abs(appliedScale - prevScale),
 			Math.abs(appliedX - prevX) / Math.max(1, this.layoutCache.stageSize.width),
@@ -628,34 +731,37 @@ export class FrameRenderer {
 			ctx.drawImage(videoCanvas, 0, 0, w, h);
 		}
 
-		if (webcamFrame && this.config.webcamWidth && this.config.webcamHeight) {
-			const layout = computeWebcamOverlayLayout({
-				stageWidth: w,
-				stageHeight: h,
-				videoWidth: this.config.webcamWidth,
-				videoHeight: this.config.webcamHeight,
-			});
-
-			if (layout) {
-				ctx.save();
-				ctx.beginPath();
-				ctx.roundRect(layout.x, layout.y, layout.width, layout.height, layout.borderRadius);
-				ctx.closePath();
-				ctx.shadowColor = "rgba(0,0,0,0.35)";
-				ctx.shadowBlur = 24;
-				ctx.shadowOffsetY = 10;
-				ctx.fillStyle = "#000000";
-				ctx.fill();
-				ctx.clip();
-				ctx.drawImage(
-					webcamFrame as unknown as CanvasImageSource,
-					layout.x,
-					layout.y,
-					layout.width,
-					layout.height,
-				);
-				ctx.restore();
+		const webcamRect = this.layoutCache?.webcamRect ?? null;
+		if (webcamFrame && webcamRect) {
+			const preset = getWebcamLayoutPresetDefinition(this.config.webcamLayoutPreset);
+			const shape = webcamRect.maskShape ?? this.config.webcamMaskShape ?? "rectangle";
+			ctx.save();
+			drawCanvasClipPath(
+				ctx,
+				webcamRect.x,
+				webcamRect.y,
+				webcamRect.width,
+				webcamRect.height,
+				shape,
+				webcamRect.borderRadius,
+			);
+			if (preset.shadow) {
+				ctx.shadowColor = preset.shadow.color;
+				ctx.shadowBlur = preset.shadow.blur;
+				ctx.shadowOffsetX = preset.shadow.offsetX;
+				ctx.shadowOffsetY = preset.shadow.offsetY;
 			}
+			ctx.fillStyle = "#000000";
+			ctx.fill();
+			ctx.clip();
+			ctx.drawImage(
+				webcamFrame as unknown as CanvasImageSource,
+				webcamRect.x,
+				webcamRect.y,
+				webcamRect.width,
+				webcamRect.height,
+			);
+			ctx.restore();
 		}
 	}
 
@@ -673,7 +779,11 @@ export class FrameRenderer {
 		}
 		this.backgroundSprite = null;
 		if (this.app) {
-			this.app.destroy(true, { children: true, texture: true, textureSource: true });
+			this.app.destroy(true, {
+				children: true,
+				texture: true,
+				textureSource: true,
+			});
 			this.app = null;
 		}
 		this.cameraContainer = null;

src/lib/exporter/gifExporter.test.ts

@@ -0,0 +1,19 @@
+import { describe, expect, it } from "vitest";
+import { calculateOutputDimensions } from "./gifExporter";
+import { GIF_SIZE_PRESETS } from "./types";
+
+describe("calculateOutputDimensions", () => {
+	it("uses the selected aspect ratio for scaled GIF exports", () => {
+		expect(calculateOutputDimensions(1080, 1920, "medium", GIF_SIZE_PRESETS, 16 / 9)).toEqual({
+			width: 1280,
+			height: 720,
+		});
+	});
+
+	it("fits original-size GIF exports within the source bounds at the selected aspect ratio", () => {
+		expect(calculateOutputDimensions(1080, 1920, "original", GIF_SIZE_PRESETS, 16 / 9)).toEqual({
+			width: 1080,
+			height: 606,
+		});
+	});
+});

src/lib/exporter/gifExporter.ts

@@ -4,6 +4,7 @@ import type {
 	CropRegion,
 	SpeedRegion,
 	TrimRegion,
+	WebcamLayoutPreset,
 	ZoomRegion,
 } from "@/components/video-editor/types";
 import { AsyncVideoFrameQueue } from "./asyncVideoFrameQueue";
@@ -39,9 +40,13 @@ interface GifExporterConfig {
 	padding?: number;
 	videoPadding?: number;
 	cropRegion: CropRegion;
+	webcamLayoutPreset?: WebcamLayoutPreset;
+	webcamMaskShape?: import("@/components/video-editor/types").WebcamMaskShape;
+	webcamPosition?: { cx: number; cy: number } | null;
 	annotationRegions?: AnnotationRegion[];
 	previewWidth?: number;
 	previewHeight?: number;
+	cursorTelemetry?: import("@/components/video-editor/types").CursorTelemetryPoint[];
 	onProgress?: (progress: ExportProgress) => void;
 }
 
@@ -58,24 +63,39 @@ export function calculateOutputDimensions(
 	sourceHeight: number,
 	sizePreset: GifSizePreset,
 	sizePresets: typeof GIF_SIZE_PRESETS,
+	targetAspectRatio = sourceWidth / sourceHeight,
 ): { width: number; height: number } {
 	const preset = sizePresets[sizePreset];
 	const maxHeight = preset.maxHeight;
+	const aspectRatio =
+		Number.isFinite(targetAspectRatio) && targetAspectRatio > 0
+			? targetAspectRatio
+			: sourceWidth / sourceHeight;
 
-	// If original is smaller than max height or preset is 'original', use source dimensions
-	if (sourceHeight <= maxHeight || sizePreset === "original") {
-		return { width: sourceWidth, height: sourceHeight };
+	const toEven = (value: number) => {
+		const evenValue = Math.max(2, Math.floor(value / 2) * 2);
+		return evenValue;
+	};
+
+	if (sizePreset === "original") {
+		const sourceAspect = sourceWidth / sourceHeight;
+		if (aspectRatio >= sourceAspect) {
+			const width = toEven(sourceWidth);
+			const height = toEven(width / aspectRatio);
+			return { width, height };
+		}
+
+		const height = toEven(sourceHeight);
+		const width = toEven(height * aspectRatio);
+		return { width, height };
 	}
 
-	// Calculate scaled dimensions preserving aspect ratio
-	const aspectRatio = sourceWidth / sourceHeight;
-	const newHeight = maxHeight;
-	const newWidth = Math.round(newHeight * aspectRatio);
+	const targetHeight = maxHeight;
+	const targetWidth = Math.round(targetHeight * aspectRatio);
 
-	// Ensure dimensions are even (required for some encoders)
 	return {
-		width: newWidth % 2 === 0 ? newWidth : newWidth + 1,
-		height: newHeight % 2 === 0 ? newHeight : newHeight + 1,
+		width: toEven(targetWidth),
+		height: toEven(targetHeight),
 	};
 }
 
@@ -121,12 +141,15 @@ export class GifExporter {
 				cropRegion: this.config.cropRegion,
 				videoWidth: videoInfo.width,
 				videoHeight: videoInfo.height,
-				webcamWidth: webcamInfo?.width,
-				webcamHeight: webcamInfo?.height,
+				webcamSize: webcamInfo ? { width: webcamInfo.width, height: webcamInfo.height } : null,
+				webcamLayoutPreset: this.config.webcamLayoutPreset,
+				webcamMaskShape: this.config.webcamMaskShape,
+				webcamPosition: this.config.webcamPosition,
 				annotationRegions: this.config.annotationRegions,
 				speedRegions: this.config.speedRegions,
 				previewWidth: this.config.previewWidth,
 				previewHeight: this.config.previewHeight,
+				cursorTelemetry: this.config.cursorTelemetry,
 			});
 			await this.renderer.initialize();
 

src/lib/exporter/gradientParser.test.ts

@@ -0,0 +1,58 @@
+import { describe, expect, it } from "vitest";
+import {
+	getLinearGradientPoints,
+	getRadialGradientShape,
+	parseCssGradient,
+	resolveLinearGradientAngle,
+} from "./gradientParser";
+
+describe("parseCssGradient", () => {
+	it("parses rgba-based gradient presets without splitting inside color functions", () => {
+		const parsed = parseCssGradient(
+			"linear-gradient( 111.6deg,  rgba(114,167,232,1) 9.4%, rgba(253,129,82,1) 43.9%, rgba(253,129,82,1) 54.8%, rgba(249,202,86,1) 86.3% )",
+		);
+
+		expect(parsed?.type).toBe("linear");
+		expect(parsed?.descriptor).toBe("111.6deg");
+		expect(parsed?.stops).toHaveLength(4);
+		expect(parsed?.stops.map((stop) => stop.color)).toEqual([
+			"rgba(114,167,232,1)",
+			"rgba(253,129,82,1)",
+			"rgba(253,129,82,1)",
+			"rgba(249,202,86,1)",
+		]);
+		expect(parsed?.stops[0]?.offset).toBeCloseTo(0.094);
+		expect(parsed?.stops[1]?.offset).toBeCloseTo(0.439);
+		expect(parsed?.stops[2]?.offset).toBeCloseTo(0.548);
+		expect(parsed?.stops[3]?.offset).toBeCloseTo(0.863);
+	});
+
+	it("fills missing stop positions for simple hex gradients", () => {
+		const parsed = parseCssGradient("linear-gradient(135deg, #FBC8B4, #2447B1)");
+
+		expect(parsed?.stops).toEqual([
+			{ color: "#FBC8B4", offset: 0 },
+			{ color: "#2447B1", offset: 1 },
+		]);
+	});
+});
+
+describe("gradient geometry", () => {
+	it("maps linear directions to canvas endpoints", () => {
+		const angle = resolveLinearGradientAngle("to right");
+		const points = getLinearGradientPoints(angle, 1920, 1080);
+
+		expect(points.x0).toBeCloseTo(0);
+		expect(points.y0).toBeCloseTo(540);
+		expect(points.x1).toBeCloseTo(1920);
+		expect(points.y1).toBeCloseTo(540);
+	});
+
+	it("uses radial positions from the descriptor", () => {
+		const shape = getRadialGradientShape("circle farthest-corner at 10% 20%", 1000, 500);
+
+		expect(shape.cx).toBe(100);
+		expect(shape.cy).toBe(100);
+		expect(shape.radius).toBeCloseTo(Math.hypot(900, 400));
+	});
+});

src/lib/exporter/gradientParser.ts

@@ -0,0 +1,236 @@
+export interface ParsedGradientStop {
+	color: string;
+	offset: number;
+}
+
+export interface ParsedGradient {
+	type: "linear" | "radial";
+	descriptor: string | null;
+	stops: ParsedGradientStop[];
+}
+
+const COLOR_TOKEN_RE = /^(#[0-9a-fA-F]{3,8}|(?:rgba?|hsla?)\([^)]*\)|[a-zA-Z-]+)/;
+
+export function parseCssGradient(input: string): ParsedGradient | null {
+	const gradientMatch = input.match(/^(linear|radial)-gradient\((.*)\)$/i);
+	if (!gradientMatch) {
+		return null;
+	}
+
+	const type = gradientMatch[1].toLowerCase() as ParsedGradient["type"];
+	const rawArgs = splitGradientArgs(gradientMatch[2]);
+	if (rawArgs.length === 0) {
+		return null;
+	}
+
+	let descriptor: string | null = null;
+	let stopArgs = rawArgs;
+
+	if (isGradientDescriptor(type, rawArgs[0])) {
+		descriptor = rawArgs[0];
+		stopArgs = rawArgs.slice(1);
+	}
+
+	const parsedStops = stopArgs
+		.map((part) => parseColorStop(part))
+		.filter((stop): stop is { color: string; offset: number | null } => stop !== null);
+
+	if (parsedStops.length === 0) {
+		return null;
+	}
+
+	return {
+		type,
+		descriptor,
+		stops: normalizeStopOffsets(parsedStops),
+	};
+}
+
+export function getLinearGradientPoints(angleDeg: number, width: number, height: number) {
+	const radians = (angleDeg * Math.PI) / 180;
+	const vx = Math.sin(radians);
+	const vy = -Math.cos(radians);
+	const halfSpan = (Math.abs(vx) * width + Math.abs(vy) * height) / 2;
+	const cx = width / 2;
+	const cy = height / 2;
+
+	return {
+		x0: cx - vx * halfSpan,
+		y0: cy - vy * halfSpan,
+		x1: cx + vx * halfSpan,
+		y1: cy + vy * halfSpan,
+	};
+}
+
+export function resolveLinearGradientAngle(descriptor: string | null): number {
+	if (!descriptor) {
+		return 180;
+	}
+
+	const angleMatch = descriptor.match(/(-?\d*\.?\d+)deg/i);
+	if (angleMatch) {
+		return Number.parseFloat(angleMatch[1]);
+	}
+
+	const normalized = descriptor.trim().toLowerCase().replace(/\s+/g, " ");
+	const directionMap: Record<string, number> = {
+		"to top": 0,
+		"to top right": 45,
+		"to right": 90,
+		"to bottom right": 135,
+		"to bottom": 180,
+		"to bottom left": 225,
+		"to left": 270,
+		"to top left": 315,
+	};
+
+	return directionMap[normalized] ?? 180;
+}
+
+export function getRadialGradientShape(descriptor: string | null, width: number, height: number) {
+	const atMatch = descriptor?.match(/at\s+(-?\d*\.?\d+)%\s+(-?\d*\.?\d+)%/i);
+	const cx = atMatch ? (Number.parseFloat(atMatch[1]) / 100) * width : width / 2;
+	const cy = atMatch ? (Number.parseFloat(atMatch[2]) / 100) * height : height / 2;
+
+	const distances = [
+		Math.hypot(cx, cy),
+		Math.hypot(width - cx, cy),
+		Math.hypot(cx, height - cy),
+		Math.hypot(width - cx, height - cy),
+	];
+
+	return {
+		cx,
+		cy,
+		radius: Math.max(...distances),
+	};
+}
+
+function splitGradientArgs(input: string): string[] {
+	const parts: string[] = [];
+	let current = "";
+	let depth = 0;
+
+	for (const char of input) {
+		if (char === "(") {
+			depth += 1;
+			current += char;
+			continue;
+		}
+
+		if (char === ")") {
+			depth = Math.max(0, depth - 1);
+			current += char;
+			continue;
+		}
+
+		if (char === "," && depth === 0) {
+			const trimmed = current.trim();
+			if (trimmed) {
+				parts.push(trimmed);
+			}
+			current = "";
+			continue;
+		}
+
+		current += char;
+	}
+
+	const trimmed = current.trim();
+	if (trimmed) {
+		parts.push(trimmed);
+	}
+
+	return parts;
+}
+
+function isGradientDescriptor(type: ParsedGradient["type"], part: string) {
+	if (type === "linear") {
+		return /^\s*to\s+/i.test(part) || /-?\d*\.?\d+deg/i.test(part);
+	}
+
+	return /\b(circle|ellipse|closest|farthest)\b/i.test(part) || /\bat\b/i.test(part);
+}
+
+function parseColorStop(part: string): { color: string; offset: number | null } | null {
+	const match = part.trim().match(COLOR_TOKEN_RE);
+	if (!match) {
+		return null;
+	}
+
+	const color = match[1];
+	const rest = part.slice(match[0].length);
+	const percentMatch = rest.match(/(-?\d*\.?\d+)%/);
+	const offset = percentMatch ? clamp(Number.parseFloat(percentMatch[1]) / 100, 0, 1) : null;
+
+	return { color, offset };
+}
+
+function normalizeStopOffsets(
+	stops: Array<{ color: string; offset: number | null }>,
+): ParsedGradientStop[] {
+	const explicitCount = stops.filter((stop) => stop.offset !== null).length;
+	if (explicitCount === 0) {
+		if (stops.length === 1) {
+			return [{ color: stops[0].color, offset: 0 }];
+		}
+
+		return stops.map((stop, index) => ({
+			color: stop.color,
+			offset: index / (stops.length - 1),
+		}));
+	}
+
+	const resolved = stops.map((stop) => stop.offset);
+	const firstExplicit = resolved.findIndex((offset) => offset !== null);
+	const lastExplicit = findLastDefinedIndex(resolved);
+
+	for (let index = 0; index < firstExplicit; index += 1) {
+		const end = resolved[firstExplicit] ?? 0;
+		resolved[index] = firstExplicit === 0 ? end : (end * index) / firstExplicit;
+	}
+
+	for (let index = lastExplicit + 1; index < resolved.length; index += 1) {
+		const start = resolved[lastExplicit] ?? 1;
+		const denominator = resolved.length - 1 - lastExplicit;
+		resolved[index] =
+			denominator <= 0 ? start : start + ((1 - start) * (index - lastExplicit)) / denominator;
+	}
+
+	let runStart = firstExplicit;
+	while (runStart < lastExplicit) {
+		const nextExplicit = resolved.findIndex((offset, index) => index > runStart && offset !== null);
+		if (nextExplicit === -1) {
+			break;
+		}
+
+		const start = resolved[runStart] ?? 0;
+		const end = resolved[nextExplicit] ?? start;
+		const gap = nextExplicit - runStart;
+
+		for (let index = runStart + 1; index < nextExplicit; index += 1) {
+			resolved[index] = start + ((end - start) * (index - runStart)) / gap;
+		}
+
+		runStart = nextExplicit;
+	}
+
+	return stops.map((stop, index) => ({
+		color: stop.color,
+		offset: clamp(resolved[index] ?? 0, 0, 1),
+	}));
+}
+
+function clamp(value: number, min: number, max: number) {
+	return Math.min(max, Math.max(min, value));
+}
+
+function findLastDefinedIndex(values: Array<number | null>) {
+	for (let index = values.length - 1; index >= 0; index -= 1) {
+		if (values[index] !== null) {
+			return index;
+		}
+	}
+
+	return -1;
+}

src/lib/exporter/streamingDecoder.test.ts

@@ -0,0 +1,47 @@
+import { describe, expect, it } from "vitest";
+import { shouldFailDecodeEndedEarly } from "./streamingDecoder";
+
+describe("shouldFailDecodeEndedEarly", () => {
+	it("does not fail once every segment has been satisfied", () => {
+		expect(
+			shouldFailDecodeEndedEarly({
+				cancelled: false,
+				lastDecodedFrameSec: 5.33,
+				requiredEndSec: 6.498,
+				streamDurationSec: 5.33,
+			}),
+		).toBe(false);
+	});
+
+	it("fails when decode stops far before the required end", () => {
+		expect(
+			shouldFailDecodeEndedEarly({
+				cancelled: false,
+				lastDecodedFrameSec: 5.33,
+				requiredEndSec: 10,
+				streamDurationSec: 5.33,
+			}),
+		).toBe(true);
+	});
+
+	it("fails when no frame could be decoded for a non-empty timeline", () => {
+		expect(
+			shouldFailDecodeEndedEarly({
+				cancelled: false,
+				lastDecodedFrameSec: null,
+				requiredEndSec: 1,
+			}),
+		).toBe(true);
+	});
+
+	it("fails when the decoder has not reached the reported stream end", () => {
+		expect(
+			shouldFailDecodeEndedEarly({
+				cancelled: false,
+				lastDecodedFrameSec: 4.9,
+				requiredEndSec: 6.498,
+				streamDurationSec: 5.33,
+			}),
+		).toBe(true);
+	});
+});

src/lib/exporter/streamingDecoder.ts

@@ -1,6 +1,8 @@
 import { WebDemuxer } from "web-demuxer";
 import type { SpeedRegion, TrimRegion } from "@/components/video-editor/types";
 
+const SOURCE_LOAD_TIMEOUT_MS = 60_000;
+
 export interface DecodedVideoInfo {
 	width: number;
 	height: number;
@@ -12,6 +14,55 @@ export interface DecodedVideoInfo {
 	audioCodec?: string;
 }
 
+type EarlyDecodeEndCheck = {
+	cancelled: boolean;
+	lastDecodedFrameSec: number | null;
+	requiredEndSec: number;
+	streamDurationSec?: number;
+};
+
+const EARLY_DECODE_END_THRESHOLD_SEC = 1;
+const METADATA_TAIL_TOLERANCE_SEC = 1.5;
+const STREAM_DURATION_MATCH_TOLERANCE_SEC = 0.25;
+
+export function shouldFailDecodeEndedEarly({
+	cancelled,
+	lastDecodedFrameSec,
+	requiredEndSec,
+	streamDurationSec,
+}: EarlyDecodeEndCheck): boolean {
+	if (cancelled || requiredEndSec <= 0) {
+		return false;
+	}
+
+	if (lastDecodedFrameSec === null) {
+		return true;
+	}
+
+	const decodeGapSec = requiredEndSec - lastDecodedFrameSec;
+	if (decodeGapSec <= EARLY_DECODE_END_THRESHOLD_SEC) {
+		return false;
+	}
+
+	if (typeof streamDurationSec !== "number" || !Number.isFinite(streamDurationSec)) {
+		return true;
+	}
+
+	const metadataTailSec = requiredEndSec - streamDurationSec;
+	const decodedNearStreamEnd =
+		Math.abs(lastDecodedFrameSec - streamDurationSec) <= STREAM_DURATION_MATCH_TOLERANCE_SEC;
+
+	if (
+		decodedNearStreamEnd &&
+		metadataTailSec > 0 &&
+		metadataTailSec <= METADATA_TAIL_TOLERANCE_SEC
+	) {
+		return false;
+	}
+
+	return true;
+}
+
 /** Caller must close the VideoFrame after use. */
 type OnFrameCallback = (
 	frame: VideoFrame,
@@ -36,7 +87,11 @@ export class StreamingVideoDecoder {
 		const isRemoteUrl = /^(https?:|blob:|data:)/i.test(videoUrl);
 
 		if (!isRemoteUrl && window.electronAPI?.readBinaryFile) {
-			const result = await window.electronAPI.readBinaryFile(videoUrl);
+			const result = await this.withTimeout(
+				window.electronAPI.readBinaryFile(videoUrl),
+				SOURCE_LOAD_TIMEOUT_MS,
+				"Timed out while loading the source video.",
+			);
 			if (!result.success || !result.data) {
 				throw new Error(result.message || result.error || "Failed to read source video");
 			}
@@ -49,11 +104,19 @@ export class StreamingVideoDecoder {
 			};
 		}
 
-		const response = await fetch(videoUrl);
+		const response = await this.withTimeout(
+			fetch(videoUrl),
+			SOURCE_LOAD_TIMEOUT_MS,
+			"Timed out while loading the source video.",
+		);
 		if (!response.ok) {
 			throw new Error(`Failed to fetch source video: ${response.status} ${response.statusText}`);
 		}
-		const blob = await response.blob();
+		const blob = await this.withTimeout(
+			response.blob(),
+			SOURCE_LOAD_TIMEOUT_MS,
+			"Timed out while reading the source video.",
+		);
 		const filename = videoUrl.split("/").pop() || "video";
 		return {
 			blob,
@@ -67,9 +130,17 @@ export class StreamingVideoDecoder {
 		// Relative URL so it resolves correctly in both dev (http) and packaged (file://) builds
 		const wasmUrl = new URL("./wasm/web-demuxer.wasm", window.location.href).href;
 		this.demuxer = new WebDemuxer({ wasmFilePath: wasmUrl });
-		await this.demuxer.load(file);
+		await this.withTimeout(
+			this.demuxer.load(file),
+			SOURCE_LOAD_TIMEOUT_MS,
+			"Timed out while parsing the source video.",
+		);
 
-		const mediaInfo = await this.demuxer.getMediaInfo();
+		const mediaInfo = await this.withTimeout(
+			this.demuxer.getMediaInfo(),
+			SOURCE_LOAD_TIMEOUT_MS,
+			"Timed out while reading video metadata.",
+		);
 		const videoStream = mediaInfo.streams.find((s) => s.codec_type_string === "video");
 
 		let frameRate = 60;
@@ -366,12 +437,17 @@ export class StreamingVideoDecoder {
 
 		const requiredEndSec = segments.length > 0 ? segments[segments.length - 1].endSec : 0;
 		if (
-			!this.cancelled &&
-			lastDecodedFrameSec !== null &&
-			requiredEndSec - lastDecodedFrameSec > 1
+			shouldFailDecodeEndedEarly({
+				cancelled: this.cancelled,
+				lastDecodedFrameSec,
+				requiredEndSec,
+				streamDurationSec: this.metadata.streamDuration,
+			})
 		) {
+			const decodedAtLabel =
+				lastDecodedFrameSec === null ? "no decoded frame" : `${lastDecodedFrameSec.toFixed(3)}s`;
 			throw new Error(
-				`Video decode ended early at ${lastDecodedFrameSec.toFixed(3)}s (needed ${requiredEndSec.toFixed(3)}s).`,
+				`Video decode ended early at ${decodedAtLabel} (needed ${requiredEndSec.toFixed(3)}s).`,
 			);
 		}
 	}
@@ -472,4 +548,20 @@ export class StreamingVideoDecoder {
 			this.demuxer = null;
 		}
 	}
+
+	private withTimeout<T>(promise: Promise<T>, timeoutMs: number, message: string): Promise<T> {
+		return new Promise<T>((resolve, reject) => {
+			const timer = window.setTimeout(() => reject(new Error(message)), timeoutMs);
+			promise.then(
+				(value) => {
+					window.clearTimeout(timer);
+					resolve(value);
+				},
+				(error) => {
+					window.clearTimeout(timer);
+					reject(error);
+				},
+			);
+		});
+	}
 }

src/lib/exporter/videoExporter.ts

@@ -3,6 +3,7 @@ import type {
 	CropRegion,
 	SpeedRegion,
 	TrimRegion,
+	WebcamLayoutPreset,
 	ZoomRegion,
 } from "@/components/video-editor/types";
 import { AsyncVideoFrameQueue } from "./asyncVideoFrameQueue";
@@ -12,6 +13,9 @@ import { VideoMuxer } from "./muxer";
 import { StreamingVideoDecoder } from "./streamingDecoder";
 import type { ExportConfig, ExportProgress, ExportResult } from "./types";
 
+const ENCODER_STALL_TIMEOUT_MS = 15_000;
+const ENCODER_FLUSH_TIMEOUT_MS = 20_000;
+
 interface VideoExporterConfig extends ExportConfig {
 	videoUrl: string;
 	webcamVideoUrl?: string;
@@ -27,9 +31,13 @@ interface VideoExporterConfig extends ExportConfig {
 	padding?: number;
 	videoPadding?: number;
 	cropRegion: CropRegion;
+	webcamLayoutPreset?: WebcamLayoutPreset;
+	webcamMaskShape?: import("@/components/video-editor/types").WebcamMaskShape;
+	webcamPosition?: { cx: number; cy: number } | null;
 	annotationRegions?: AnnotationRegion[];
 	previewWidth?: number;
 	previewHeight?: number;
+	cursorTelemetry?: import("@/components/video-editor/types").CursorTelemetryPoint[];
 	onProgress?: (progress: ExportProgress) => void;
 }
 
@@ -43,35 +51,76 @@ export class VideoExporter {
 	private webcamDecoder: StreamingVideoDecoder | null = null;
 	private cancelled = false;
 	private encodeQueue = 0;
-	// Increased queue size for better throughput with hardware encoding
+	// Keep a smaller queue for software encoding so Windows does not balloon memory.
 	private readonly MAX_ENCODE_QUEUE = 120;
 	private videoDescription: Uint8Array | undefined;
 	private videoColorSpace: VideoColorSpaceInit | undefined;
-	// Track muxing promises for parallel processing
 	private muxingPromises: Promise<void>[] = [];
 	private chunkCount = 0;
+	private lastEncoderOutputAt = 0;
+	private fatalEncoderError: Error | null = null;
 
 	constructor(config: VideoExporterConfig) {
 		this.config = config;
 	}
 
 	async export(): Promise<ExportResult> {
-		let webcamFrameQueue: AsyncVideoFrameQueue | null = null;
-		try {
-			this.cleanup();
-			this.cancelled = false;
+		const encoderPreferences = this.getEncoderPreferences();
+		let lastError: Error | null = null;
 
-			// Initialize streaming decoder and load video metadata
-			this.streamingDecoder = new StreamingVideoDecoder();
-			const videoInfo = await this.streamingDecoder.loadMetadata(this.config.videoUrl);
+		for (const encoderPreference of encoderPreferences) {
+			try {
+				return await this.exportWithEncoderPreference(encoderPreference);
+			} catch (error) {
+				const normalizedError = error instanceof Error ? error : new Error(String(error));
+				lastError = normalizedError;
+
+				if (this.cancelled) {
+					return { success: false, error: "Export cancelled" };
+				}
+
+				if (encoderPreferences.length > 1) {
+					console.warn(
+						`[VideoExporter] ${encoderPreference} export attempt failed:`,
+						normalizedError,
+					);
+				}
+			} finally {
+				this.cleanup();
+			}
+		}
+
+		return {
+			success: false,
+			error: lastError?.message || "Export failed",
+		};
+	}
+
+	private async exportWithEncoderPreference(
+		encoderPreference: HardwareAcceleration,
+	): Promise<ExportResult> {
+		let webcamFrameQueue: AsyncVideoFrameQueue | null = null;
+		let stopWebcamDecode = false;
+		let webcamDecodeError: Error | null = null;
+		let webcamDecodePromise: Promise<void> | null = null;
+		let webcamDecoder: StreamingVideoDecoder | null = null;
+
+		this.cleanup();
+		this.cancelled = false;
+		this.fatalEncoderError = null;
+
+		try {
+			const streamingDecoder = new StreamingVideoDecoder();
+			this.streamingDecoder = streamingDecoder;
+			const videoInfo = await streamingDecoder.loadMetadata(this.config.videoUrl);
 			let webcamInfo: Awaited<ReturnType<StreamingVideoDecoder["loadMetadata"]>> | null = null;
 			if (this.config.webcamVideoUrl) {
-				this.webcamDecoder = new StreamingVideoDecoder();
-				webcamInfo = await this.webcamDecoder.loadMetadata(this.config.webcamVideoUrl);
+				webcamDecoder = new StreamingVideoDecoder();
+				this.webcamDecoder = webcamDecoder;
+				webcamInfo = await webcamDecoder.loadMetadata(this.config.webcamVideoUrl);
 			}
 
-			// Initialize frame renderer
-			this.renderer = new FrameRenderer({
+			const renderer = new FrameRenderer({
 				width: this.config.width,
 				height: this.config.height,
 				wallpaper: this.config.wallpaper,
@@ -85,25 +134,27 @@ export class VideoExporter {
 				cropRegion: this.config.cropRegion,
 				videoWidth: videoInfo.width,
 				videoHeight: videoInfo.height,
-				webcamWidth: webcamInfo?.width,
-				webcamHeight: webcamInfo?.height,
+				webcamSize: webcamInfo ? { width: webcamInfo.width, height: webcamInfo.height } : null,
+				webcamLayoutPreset: this.config.webcamLayoutPreset,
+				webcamMaskShape: this.config.webcamMaskShape,
+				webcamPosition: this.config.webcamPosition,
 				annotationRegions: this.config.annotationRegions,
 				speedRegions: this.config.speedRegions,
 				previewWidth: this.config.previewWidth,
 				previewHeight: this.config.previewHeight,
+				cursorTelemetry: this.config.cursorTelemetry,
 			});
-			await this.renderer.initialize();
+			this.renderer = renderer;
+			await renderer.initialize();
 
-			// Initialize video encoder
-			await this.initializeEncoder();
+			await this.initializeEncoder(encoderPreference);
 
-			// Initialize muxer (with audio if source has an audio track)
 			const hasAudio = videoInfo.hasAudio;
-			this.muxer = new VideoMuxer(this.config, hasAudio);
-			await this.muxer.initialize();
+			const muxer = new VideoMuxer(this.config, hasAudio);
+			this.muxer = muxer;
+			await muxer.initialize();
 
-			// Calculate effective duration and frame count (excluding trim regions)
-			const effectiveDuration = this.streamingDecoder.getEffectiveDuration(
+			const effectiveDuration = streamingDecoder.getEffectiveDuration(
 				this.config.trimRegions,
 				this.config.speedRegions,
 			);
@@ -115,16 +166,19 @@ export class VideoExporter {
 			console.log("[VideoExporter] Total frames to export:", totalFrames);
 			console.log("[VideoExporter] Using streaming decode (web-demuxer + VideoDecoder)");
 
-			const frameDuration = 1_000_000 / this.config.frameRate; // in microseconds
+			const frameDuration = 1_000_000 / this.config.frameRate;
 			let frameIndex = 0;
+			const maxEncodeQueue =
+				encoderPreference === "prefer-software"
+					? Math.min(this.MAX_ENCODE_QUEUE, 32)
+					: this.MAX_ENCODE_QUEUE;
+
 			webcamFrameQueue = this.config.webcamVideoUrl ? new AsyncVideoFrameQueue() : null;
-			let stopWebcamDecode = false;
-			let webcamDecodeError: Error | null = null;
-			const webcamDecodePromise =
-				this.webcamDecoder && webcamFrameQueue
+			webcamDecodePromise =
+				webcamDecoder && webcamFrameQueue
 					? (() => {
 							const queue = webcamFrameQueue;
-							return this.webcamDecoder
+							return webcamDecoder
 								.decodeAll(
 									this.config.frameRate,
 									this.config.trimRegions,
@@ -142,7 +196,7 @@ export class VideoExporter {
 								)
 								.catch((error) => {
 									webcamDecodeError = error instanceof Error ? error : new Error(String(error));
-									throw error;
+									throw webcamDecodeError;
 								})
 								.finally(() => {
 									if (webcamDecodeError) {
@@ -154,8 +208,7 @@ export class VideoExporter {
 						})()
 					: null;
 
-			// Stream decode and process frames — no seeking!
-			await this.streamingDecoder.decodeAll(
+			await streamingDecoder.decodeAll(
 				this.config.frameRate,
 				this.config.trimRegions,
 				this.config.speedRegions,
@@ -166,22 +219,31 @@ export class VideoExporter {
 							return;
 						}
 
+						if (this.fatalEncoderError) {
+							throw this.fatalEncoderError;
+						}
+
 						const timestamp = frameIndex * frameDuration;
 						webcamFrame = webcamFrameQueue ? await webcamFrameQueue.dequeue() : null;
-						const renderer = this.renderer;
-						if (this.cancelled || !renderer) {
+						if (this.cancelled) {
 							return;
 						}
 
-						// Render the frame with all effects using source timestamp
-						const sourceTimestampUs = sourceTimestampMs * 1000; // Convert to microseconds
+						const sourceTimestampUs = sourceTimestampMs * 1000;
 						await renderer.renderFrame(videoFrame, sourceTimestampUs, webcamFrame);
 
 						const canvas = renderer.getCanvas();
 
-						// Create VideoFrame from canvas on GPU without reading pixels
-						// @ts-expect-error - colorSpace not in TypeScript definitions but works at runtime
-						const exportFrame = new VideoFrame(canvas, {
+						// Read raw pixels from the canvas instead of passing
+						// the canvas directly to VideoFrame. On some Linux
+						// systems the GPU shared-image path (EGL/Ozone) fails
+						// silently, producing empty frames.
+						const canvasCtx = canvas.getContext("2d")!;
+						const imageData = canvasCtx.getImageData(0, 0, canvas.width, canvas.height);
+						const exportFrame = new VideoFrame(imageData.data.buffer, {
+							format: "RGBA",
+							codedWidth: canvas.width,
+							codedHeight: canvas.height,
 							timestamp,
 							duration: frameDuration,
 							colorSpace: {
@@ -192,12 +254,19 @@ export class VideoExporter {
 							},
 						});
 
-						// Check encoder queue before encoding to keep it full
 						while (
 							this.encoder &&
-							this.encoder.encodeQueueSize >= this.MAX_ENCODE_QUEUE &&
+							this.encoder.encodeQueueSize >= maxEncodeQueue &&
 							!this.cancelled
 						) {
+							if (Date.now() - this.lastEncoderOutputAt > ENCODER_STALL_TIMEOUT_MS) {
+								exportFrame.close();
+								throw new Error(
+									encoderPreference === "prefer-hardware"
+										? "The hardware video encoder stopped responding. Retrying with a safer encoder."
+										: "The video encoder stopped responding during export.",
+								);
+							}
 							await new Promise((resolve) => setTimeout(resolve, 5));
 						}
 
@@ -211,18 +280,14 @@ export class VideoExporter {
 						}
 
 						exportFrame.close();
-
 						frameIndex++;
 
-						// Update progress
-						if (this.config.onProgress) {
-							this.config.onProgress({
-								currentFrame: frameIndex,
-								totalFrames,
-								percentage: (frameIndex / totalFrames) * 100,
-								estimatedTimeRemaining: 0,
-							});
-						}
+						this.reportProgress({
+							currentFrame: frameIndex,
+							totalFrames,
+							percentage: (frameIndex / totalFrames) * 100,
+							estimatedTimeRemaining: 0,
+						});
 					} finally {
 						videoFrame.close();
 						webcamFrame?.close();
@@ -234,38 +299,47 @@ export class VideoExporter {
 				return { success: false, error: "Export cancelled" };
 			}
 
+			if (this.fatalEncoderError) {
+				throw this.fatalEncoderError;
+			}
+
 			stopWebcamDecode = true;
 			webcamFrameQueue?.destroy();
-			this.webcamDecoder?.cancel();
+			webcamDecoder?.cancel();
 			await webcamDecodePromise;
 
-			// Finalize encoding
 			if (this.encoder && this.encoder.state === "configured") {
-				await this.encoder.flush();
+				await this.withTimeout(
+					this.encoder.flush(),
+					ENCODER_FLUSH_TIMEOUT_MS,
+					encoderPreference === "prefer-hardware"
+						? "The hardware video encoder stopped responding while finalizing the export."
+						: "The video encoder stopped responding while finalizing the export.",
+				);
+			}
+
+			if (this.fatalEncoderError) {
+				throw this.fatalEncoderError;
 			}
 
-			// Wait for all video muxing operations to complete
 			await Promise.all(this.muxingPromises);
 
-			if (this.config.onProgress) {
-				this.config.onProgress({
-					currentFrame: totalFrames,
-					totalFrames,
-					percentage: 100,
-					estimatedTimeRemaining: 0,
-					phase: "finalizing",
-				});
-			}
+			this.reportProgress({
+				currentFrame: totalFrames,
+				totalFrames,
+				percentage: 100,
+				estimatedTimeRemaining: 0,
+				phase: "finalizing",
+			});
 
-			// Process audio track if present
 			if (hasAudio && !this.cancelled) {
-				const demuxer = this.streamingDecoder!.getDemuxer();
+				const demuxer = streamingDecoder.getDemuxer();
 				if (demuxer) {
 					console.log("[VideoExporter] Processing audio track...");
 					this.audioProcessor = new AudioProcessor();
 					await this.audioProcessor.process(
 						demuxer,
-						this.muxer!,
+						muxer,
 						this.config.videoUrl,
 						this.config.trimRegions,
 						this.config.speedRegions,
@@ -274,31 +348,30 @@ export class VideoExporter {
 				}
 			}
 
-			// Finalize muxer and get output blob
-			const blob = await this.muxer!.finalize();
-
+			const blob = await muxer.finalize();
 			return { success: true, blob };
-		} catch (error) {
-			console.error("Export error:", error);
-			return {
-				success: false,
-				error: error instanceof Error ? error.message : String(error),
-			};
 		} finally {
+			stopWebcamDecode = true;
 			webcamFrameQueue?.destroy();
-			this.cleanup();
+			webcamDecoder?.cancel();
+			if (webcamDecodePromise) {
+				await webcamDecodePromise.catch(() => undefined);
+			}
 		}
 	}
 
-	private async initializeEncoder(): Promise<void> {
+	private async initializeEncoder(hardwareAcceleration: HardwareAcceleration): Promise<void> {
 		this.encodeQueue = 0;
 		this.muxingPromises = [];
 		this.chunkCount = 0;
+		this.lastEncoderOutputAt = Date.now();
+		this.fatalEncoderError = null;
 		let videoDescription: Uint8Array | undefined;
 
 		this.encoder = new VideoEncoder({
 			output: (chunk, meta) => {
-				// Capture decoder config metadata from encoder output
+				this.lastEncoderOutputAt = Date.now();
+
 				if (meta?.decoderConfig?.description && !videoDescription) {
 					const desc = meta.decoderConfig.description;
 					if (desc instanceof ArrayBuffer || desc instanceof SharedArrayBuffer) {
@@ -308,19 +381,17 @@ export class VideoExporter {
 					}
 					this.videoDescription = videoDescription;
 				}
-				// Capture colorSpace from encoder metadata if provided
+
 				if (meta?.decoderConfig?.colorSpace && !this.videoColorSpace) {
 					this.videoColorSpace = meta.decoderConfig.colorSpace;
 				}
 
-				// Stream chunk to muxer immediately (parallel processing)
 				const isFirstChunk = this.chunkCount === 0;
 				this.chunkCount++;
 
 				const muxingPromise = (async () => {
 					try {
 						if (isFirstChunk && this.videoDescription) {
-							// Add decoder config for the first chunk
 							const colorSpace = this.videoColorSpace || {
 								primaries: "bt709",
 								transfer: "iec61966-2-1",
@@ -352,43 +423,37 @@ export class VideoExporter {
 			},
 			error: (error) => {
 				console.error("[VideoExporter] Encoder error:", error);
-				// Stop export encoding failed
-				this.cancelled = true;
+				this.fatalEncoderError =
+					error instanceof Error ? error : new Error(`Video encoder error: ${String(error)}`);
+				this.streamingDecoder?.cancel();
+				this.webcamDecoder?.cancel();
 			},
 		});
 
-		const codec = this.config.codec || "avc1.640033";
-
 		const encoderConfig: VideoEncoderConfig = {
-			codec,
+			codec: this.config.codec || "avc1.640033",
 			width: this.config.width,
 			height: this.config.height,
 			bitrate: this.config.bitrate,
 			framerate: this.config.frameRate,
-			latencyMode: "quality", // Changed from 'realtime' to 'quality' for better throughput
+			latencyMode: "quality",
 			bitrateMode: "variable",
-			hardwareAcceleration: "prefer-hardware",
+			hardwareAcceleration,
 		};
 
-		// Check hardware support first
-		const hardwareSupport = await VideoEncoder.isConfigSupported(encoderConfig);
-
-		if (hardwareSupport.supported) {
-			// Use hardware encoding
-			console.log("[VideoExporter] Using hardware acceleration");
-			this.encoder.configure(encoderConfig);
-		} else {
-			// Fall back to software encoding
-			console.log("[VideoExporter] Hardware not supported, using software encoding");
-			encoderConfig.hardwareAcceleration = "prefer-software";
-
-			const softwareSupport = await VideoEncoder.isConfigSupported(encoderConfig);
-			if (!softwareSupport.supported) {
-				throw new Error("Video encoding not supported on this system");
-			}
-
-			this.encoder.configure(encoderConfig);
+		const support = await VideoEncoder.isConfigSupported(encoderConfig);
+		if (!support.supported) {
+			throw new Error(
+				hardwareAcceleration === "prefer-hardware"
+					? "Hardware video encoding is not supported on this system."
+					: "Software video encoding is not supported on this system.",
+			);
 		}
+
+		console.log(
+			`[VideoExporter] Using ${hardwareAcceleration === "prefer-hardware" ? "hardware" : "software"} acceleration`,
+		);
+		this.encoder.configure(encoderConfig);
 	}
 
 	cancel(): void {
@@ -451,5 +516,34 @@ export class VideoExporter {
 		this.chunkCount = 0;
 		this.videoDescription = undefined;
 		this.videoColorSpace = undefined;
+		this.lastEncoderOutputAt = 0;
+		this.fatalEncoderError = null;
+	}
+
+	private getEncoderPreferences(): HardwareAcceleration[] {
+		if (typeof navigator !== "undefined" && /\bWindows\b/i.test(navigator.userAgent)) {
+			return ["prefer-software", "prefer-hardware"];
+		}
+		return ["prefer-hardware", "prefer-software"];
+	}
+
+	private reportProgress(progress: ExportProgress): void {
+		this.config.onProgress?.(progress);
+	}
+
+	private withTimeout<T>(promise: Promise<T>, timeoutMs: number, message: string): Promise<T> {
+		return new Promise<T>((resolve, reject) => {
+			const timer = window.setTimeout(() => reject(new Error(message)), timeoutMs);
+			promise.then(
+				(value) => {
+					window.clearTimeout(timer);
+					resolve(value);
+				},
+				(error) => {
+					window.clearTimeout(timer);
+					reject(error);
+				},
+			);
+		});
 	}
 }

src/lib/frameStep.ts

@@ -0,0 +1,15 @@
+/** Duration of a single frame in seconds at 60 FPS (~16.67ms). */
+export const FRAME_DURATION_SEC = 1 / 60;
+
+/**
+ * Compute the new playhead time after stepping one frame forward or backward.
+ * The result is clamped to the range [0, duration].
+ */
+export function computeFrameStepTime(
+	currentTime: number,
+	duration: number,
+	direction: "forward" | "backward",
+): number {
+	const delta = direction === "forward" ? FRAME_DURATION_SEC : -FRAME_DURATION_SEC;
+	return Math.min(duration, Math.max(0, currentTime + delta));
+}

src/lib/requestCameraAccess.ts

@@ -0,0 +1,57 @@
+export type CameraAccessResult = {
+	success: boolean;
+	granted: boolean;
+	status: string;
+	error?: string;
+};
+
+function getDeniedStatus(error: unknown) {
+	if (error instanceof DOMException) {
+		return error.name;
+	}
+
+	return "unknown";
+}
+
+export async function requestCameraAccess(): Promise<CameraAccessResult> {
+	if (window.electronAPI?.requestCameraAccess) {
+		try {
+			const electronResult = await window.electronAPI.requestCameraAccess();
+			if (!electronResult.success || !electronResult.granted) {
+				return electronResult;
+			}
+		} catch (error) {
+			return {
+				success: false,
+				granted: false,
+				status: "error",
+				error: String(error),
+			};
+		}
+	}
+
+	if (!navigator.mediaDevices?.getUserMedia) {
+		return {
+			success: false,
+			granted: false,
+			status: "unsupported",
+			error: "Camera access is not supported in this runtime.",
+		};
+	}
+
+	try {
+		const stream = await navigator.mediaDevices.getUserMedia({
+			audio: false,
+			video: true,
+		});
+		stream.getTracks().forEach((track) => track.stop());
+		return { success: true, granted: true, status: "granted" };
+	} catch (error) {
+		return {
+			success: true,
+			granted: false,
+			status: getDeniedStatus(error),
+			error: String(error),
+		};
+	}
+}

src/lib/shortcuts.ts

@@ -21,14 +21,16 @@ export interface ShortcutBinding {
 export type ShortcutsConfig = Record<ShortcutAction, ShortcutBinding>;
 
 export interface FixedShortcut {
+	i18nKey: string;
 	label: string;
 	display: string;
 	bindings: ShortcutBinding[];
 }
 
 export const FIXED_SHORTCUTS: FixedShortcut[] = [
-	{ label: "Undo", display: "Ctrl + Z", bindings: [{ key: "z", ctrl: true }] },
+	{ i18nKey: "undo", label: "Undo", display: "Ctrl + Z", bindings: [{ key: "z", ctrl: true }] },
 	{
+		i18nKey: "redo",
 		label: "Redo",
 		display: "Ctrl + Shift + Z / Ctrl + Y",
 		bindings: [
@@ -36,19 +38,38 @@ export const FIXED_SHORTCUTS: FixedShortcut[] = [
 			{ key: "y", ctrl: true },
 		],
 	},
-	{ label: "Cycle Annotations Forward", display: "Tab", bindings: [{ key: "tab" }] },
 	{
+		i18nKey: "cycleAnnotationsForward",
+		label: "Cycle Annotations Forward",
+		display: "Tab",
+		bindings: [{ key: "tab" }],
+	},
+	{
+		i18nKey: "cycleAnnotationsBackward",
 		label: "Cycle Annotations Backward",
 		display: "Shift + Tab",
 		bindings: [{ key: "tab", shift: true }],
 	},
 	{
+		i18nKey: "deleteSelectedAlt",
 		label: "Delete Selected (alt)",
 		display: "Del / ⌫",
 		bindings: [{ key: "delete" }, { key: "backspace" }],
 	},
-	{ label: "Pan Timeline", display: "Shift + Ctrl + Scroll", bindings: [] },
-	{ label: "Zoom Timeline", display: "Ctrl + Scroll", bindings: [] },
+	{
+		i18nKey: "panTimeline",
+		label: "Pan Timeline",
+		display: "Shift + Ctrl + Scroll",
+		bindings: [],
+	},
+	{ i18nKey: "zoomTimeline", label: "Zoom Timeline", display: "Ctrl + Scroll", bindings: [] },
+	{ i18nKey: "frameBack", label: "Frame Back", display: "←", bindings: [{ key: "arrowleft" }] },
+	{
+		i18nKey: "frameForward",
+		label: "Frame Forward",
+		display: "→",
+		bindings: [{ key: "arrowright" }],
+	},
 ];
 
 export type ShortcutConflict =

src/lib/webcamMaskShapes.ts

@@ -0,0 +1,48 @@
+import type { WebcamMaskShape } from "@/components/video-editor/types";
+
+/**
+ * Returns a CSS clip-path value for the given shape, or null if borderRadius alone suffices.
+ */
+export function getCssClipPath(shape: WebcamMaskShape): string | null {
+	switch (shape) {
+		case "circle":
+			return "circle(50% at 50% 50%)";
+		case "rectangle":
+		case "rounded":
+		case "square":
+		default:
+			return null;
+	}
+}
+
+/**
+ * Draws a Canvas 2D clip path for the given webcam mask shape.
+ * Call ctx.beginPath() is handled internally; caller should call ctx.clip() after.
+ */
+export function drawCanvasClipPath(
+	ctx: CanvasRenderingContext2D,
+	x: number,
+	y: number,
+	w: number,
+	h: number,
+	shape: WebcamMaskShape,
+	borderRadius: number,
+): void {
+	ctx.beginPath();
+	switch (shape) {
+		case "circle": {
+			const cx = x + w / 2;
+			const cy = y + h / 2;
+			const r = Math.min(w, h) / 2;
+			ctx.arc(cx, cy, r, 0, Math.PI * 2);
+			break;
+		}
+		case "rectangle":
+		case "rounded":
+		case "square":
+		default:
+			ctx.roundRect(x, y, w, h, borderRadius);
+			break;
+	}
+	ctx.closePath();
+}

src/lib/webcamOverlay.test.ts

@@ -1,33 +0,0 @@
-import { describe, expect, it } from "vitest";
-import { computeWebcamOverlayLayout } from "./webcamOverlay";
-
-describe("computeWebcamOverlayLayout", () => {
-	it("anchors the overlay in the lower-right corner", () => {
-		const layout = computeWebcamOverlayLayout({
-			stageWidth: 1920,
-			stageHeight: 1080,
-			videoWidth: 1280,
-			videoHeight: 720,
-		});
-
-		expect(layout).not.toBeNull();
-		expect(layout!.x + layout!.width).toBeLessThanOrEqual(1920);
-		expect(layout!.y + layout!.height).toBeLessThanOrEqual(1080);
-		expect(layout!.x).toBeGreaterThan(1920 / 2);
-		expect(layout!.y).toBeGreaterThan(1080 / 2);
-	});
-
-	it("keeps the overlay within the configured stage fraction while preserving aspect ratio", () => {
-		const layout = computeWebcamOverlayLayout({
-			stageWidth: 1280,
-			stageHeight: 720,
-			videoWidth: 1920,
-			videoHeight: 1080,
-		});
-
-		expect(layout).not.toBeNull();
-		expect(layout!.width).toBeLessThanOrEqual(Math.round(1280 * 0.18) + 1);
-		expect(layout!.height).toBeLessThanOrEqual(Math.round(720 * 0.18) + 1);
-		expect(Math.abs(layout!.width * 1080 - layout!.height * 1920)).toBeLessThanOrEqual(1920);
-	});
-});

src/lib/webcamOverlay.ts

@@ -1,45 +0,0 @@
-export interface WebcamOverlayLayout {
-	x: number;
-	y: number;
-	width: number;
-	height: number;
-	margin: number;
-	borderRadius: number;
-}
-
-const MAX_STAGE_FRACTION = 0.18;
-const MARGIN_FRACTION = 0.02;
-const MIN_SIZE = 96;
-const MAX_BORDER_RADIUS = 24;
-
-export function computeWebcamOverlayLayout(params: {
-	stageWidth: number;
-	stageHeight: number;
-	videoWidth: number;
-	videoHeight: number;
-}): WebcamOverlayLayout | null {
-	const { stageWidth, stageHeight, videoWidth, videoHeight } = params;
-
-	if (stageWidth <= 0 || stageHeight <= 0 || videoWidth <= 0 || videoHeight <= 0) {
-		return null;
-	}
-
-	const margin = Math.max(12, Math.round(Math.min(stageWidth, stageHeight) * MARGIN_FRACTION));
-	const maxWidth = Math.max(MIN_SIZE, stageWidth * MAX_STAGE_FRACTION);
-	const maxHeight = Math.max(MIN_SIZE, stageHeight * MAX_STAGE_FRACTION);
-	const scale = Math.min(maxWidth / videoWidth, maxHeight / videoHeight);
-	const width = Math.round(videoWidth * scale);
-	const height = Math.round(videoHeight * scale);
-
-	return {
-		x: Math.max(0, Math.round(stageWidth - margin - width)),
-		y: Math.max(0, Math.round(stageHeight - margin - height)),
-		width,
-		height,
-		margin,
-		borderRadius: Math.min(
-			MAX_BORDER_RADIUS,
-			Math.max(12, Math.round(Math.min(width, height) * 0.12)),
-		),
-	};
-}

src/main.tsx

@@ -1,10 +1,13 @@
 import React from "react";
 import ReactDOM from "react-dom/client";
 import App from "./App.tsx";
+import { I18nProvider } from "./contexts/I18nContext";
 import "./index.css";
 
 ReactDOM.createRoot(document.getElementById("root")!).render(
 	<React.StrictMode>
-		<App />
+		<I18nProvider>
+			<App />
+		</I18nProvider>
 	</React.StrictMode>,
 );

src/utils/aspectRatioUtils.ts

@@ -67,6 +67,10 @@ export function getAspectRatioLabel(aspectRatio: AspectRatio): string {
 	return aspectRatio;
 }
 
+export function isPortraitAspectRatio(aspectRatio: AspectRatio): boolean {
+	return getAspectRatioValue(aspectRatio) < 1;
+}
+
 export function formatAspectRatioForCSS(aspectRatio: AspectRatio, nativeRatio?: number): string {
 	if (aspectRatio === "native") return String(nativeRatio ?? 16 / 9);
 	return aspectRatio.replace(":", "/");

src/vite-env.d.ts

@@ -119,5 +119,6 @@ interface Window {
 		setMicrophoneExpanded: (expanded: boolean) => void;
 		setHasUnsavedChanges: (hasChanges: boolean) => void;
 		onRequestSaveBeforeClose: (callback: () => Promise<boolean> | boolean) => () => void;
+		setLocale: (locale: string) => Promise<void>;
 	};
 }

tests/e2e/gif-export.spec.ts

@@ -58,14 +58,23 @@ test("exports a GIF from a loaded video", async () => {
 			);
 		});
 
-		await hudWindow.evaluate((videoPath: string) => {
-			window.electronAPI.setCurrentVideoPath(videoPath);
-			try {
+		try {
+			await hudWindow.evaluate(async (videoPath: string) => {
+				await window.electronAPI.setCurrentVideoPath(videoPath);
 				window.electronAPI.switchToEditor();
-			} catch {
-				// Expected: HUD window closes during this call, killing the context.
+			}, TEST_VIDEO);
+		} catch (error) {
+			// Expected: switchToEditor() closes the HUD window, which terminates
+			// the Playwright page context before evaluate() can resolve.
+			if (
+				!(
+					error instanceof Error &&
+					error.message.includes("Target page, context or browser has been closed")
+				)
+			) {
+				throw error;
 			}
-		}, TEST_VIDEO);
+		}
 
 		// ── 3. Switch to the editor window. This closes the HUD and opens
 		//       a new BrowserWindow with ?windowType=editor.
@@ -87,8 +96,8 @@ test("exports a GIF from a loaded video", async () => {
 		await editorWindow.getByTestId("testId-gif-format-button").click();
 		await editorWindow.getByTestId("testId-export-button").click();
 
-		// ── 6. Wait for the toast to say exported successfully
-		await expect(editorWindow.getByText(`GIF exported successfully to pending`)).toBeVisible({
+		// ── 6. Wait for the success toast.
+		await expect(editorWindow.getByText("GIF exported successfully")).toBeVisible({
 			timeout: 90_000,
 		});
 

vitest.config.ts

@@ -4,7 +4,7 @@ import { defineConfig } from "vitest/config";
 export default defineConfig({
 	test: {
 		globals: true,
-		environment: "node",
+		environment: "jsdom",
 		include: ["src/**/*.{test,spec}.{js,mjs,cjs,ts,mts,cts,jsx,tsx}"],
 	},
 	resolve: {