test: expose source selector hooks

src/components/launch/LaunchWindow.tsx

@@ -612,6 +612,7 @@ export function LaunchWindow() {
 
 				{/* Source selector */}
 				<button
+					data-testid="launch-source-selector-button"
 					className={`${hudGroupClasses} h-8 px-2.5 ${styles.electronNoDrag}`}
 					onClick={openSourceSelector}
 					disabled={recording}

src/components/launch/SourceSelector.tsx

@@ -74,9 +74,12 @@ export function SourceSelector() {
 
 	const renderSourceCard = (source: DesktopSource) => {
 		const isSelected = selectedSource?.id === source.id;
+		const sourceKind = source.id.startsWith("screen:") ? "screen" : "window";
 		return (
 			<div
 				key={source.id}
+				data-testid="source-selector-card"
+				data-source-kind={sourceKind}
 				className={`${styles.sourceCard} ${isSelected ? styles.selected : ""} p-1.5`}
 				onClick={() => handleSourceSelect(source)}
 			>