feat: add migrate-to-cli URI handler for exporting settings to CLI

Add a /migrate-to-cli route to the VS Code extension's URI handler that
exports all secrets and globalState settings to ~/.cline/data/ so the
CLI can import them during onboarding.

src/services/uri/SharedUriHandler.ts

@@ -1,5 +1,6 @@
 import { WebviewProvider } from "@/core/webview"
 import { Logger } from "@/shared/services/Logger"
+import { migrateToCli } from "./migrateToCli"
 
 /**
  * Shared URI handler that processes both VSCode URI events and HTTP server callbacks
@@ -28,6 +29,11 @@ export class SharedUriHandler {
 				}),
 		)
 
+		// Routes that don't require a visible webview
+		if (path === "/migrate-to-cli") {
+			return migrateToCli()
+		}
+
 		const visibleWebview = WebviewProvider.getVisibleInstance()
 
 		if (!visibleWebview) {

src/services/uri/migrateToCli.ts

@@ -0,0 +1,68 @@
+/**
+ * Exports VS Code extension secrets and settings to the CLI's storage directory (~/.cline/data/)
+ * so the CLI can import them during onboarding without the user re-authenticating.
+ */
+
+import * as fs from "fs"
+import * as os from "os"
+import * as path from "path"
+import { StateManager } from "@/core/storage/StateManager"
+import { HostProvider } from "@/hosts/host-provider"
+import { ShowMessageType } from "@/shared/proto/index.host"
+import { Logger } from "@/shared/services/Logger"
+import { GlobalStateAndSettingKeys, SecretKeys } from "@/shared/storage/state-keys"
+
+const CLI_DATA_DIR = path.join(os.homedir(), ".cline", "data")
+
+export async function migrateToCli(): Promise<boolean> {
+	try {
+		const stateManager = StateManager.get()
+
+		// Read all secrets from StateManager cache
+		const secrets: Record<string, string> = {}
+		for (const key of SecretKeys) {
+			const value = stateManager.getSecretKey(key)
+			if (value) {
+				secrets[key] = value
+			}
+		}
+
+		// Read all globalState settings from StateManager cache
+		const globalState: Record<string, any> = {}
+		for (const key of GlobalStateAndSettingKeys) {
+			const value = stateManager.getGlobalStateKey(key as any)
+			if (value !== undefined) {
+				globalState[key] = value
+			}
+		}
+
+		// Ensure directory exists
+		fs.mkdirSync(CLI_DATA_DIR, { recursive: true })
+
+		// Write secrets with restricted permissions (owner read/write only)
+		const secretsPath = path.join(CLI_DATA_DIR, "secrets.json")
+		fs.writeFileSync(secretsPath, JSON.stringify(secrets, null, 2), { mode: 0o600 })
+
+		// Write globalState with restricted permissions
+		const globalStatePath = path.join(CLI_DATA_DIR, "globalState.json")
+		fs.writeFileSync(globalStatePath, JSON.stringify(globalState, null, 2), { mode: 0o600 })
+
+		Logger.info(
+			`[migrateToCli] Exported ${Object.keys(secrets).length} secrets and ${Object.keys(globalState).length} settings to ${CLI_DATA_DIR}`,
+		)
+
+		HostProvider.window.showMessage({
+			type: ShowMessageType.INFORMATION,
+			message: "Cline CLI setup complete. You can return to your terminal.",
+		})
+
+		return true
+	} catch (error) {
+		Logger.error("[migrateToCli] Failed to export state for CLI:", error)
+		HostProvider.window.showMessage({
+			type: ShowMessageType.ERROR,
+			message: "Failed to export settings to Cline CLI. Check the output log for details.",
+		})
+		return false
+	}
+}