MAESTRO: Add file tab overlay menu with hover actions

Implements file-specific overlay menu for FileTab component:
- Add shell:showItemInFolder IPC handler for "Reveal in Finder" action
- Add showItemInFolder to shell preload API and global.d.ts types
- Extend FileTabProps with position and close action callbacks
- Implement full overlay menu with file actions:
  - Copy File Path/Name to clipboard
  - Open in Default App via file:// URL
  - Reveal in Finder via new showItemInFolder API
  - Move to First/Last Position
  - Close Tab/Other/Left/Right actions
- Add 10 tests for file tab overlay menu
- Add 3 tests for shell:showItemInFolder handler

src/__tests__/renderer/components/TabBar.test.tsx

@@ -3010,9 +3010,9 @@ describe('FileTab overlay menu', () => {
 
 		// Should show Close Other Tabs option
 		const closeOtherButtons = screen.getAllByText('Close Other Tabs');
-		// Find the one in the file tab overlay (has file-text-icon)
+		// Find the one in the file tab overlay (has Copy File Path which identifies file tab overlay)
 		const closeOtherButton = closeOtherButtons.find((btn) =>
-			btn.closest('.shadow-xl')?.querySelector('[data-testid="file-text-icon"]')
+			btn.closest('.shadow-xl')?.textContent?.includes('Copy File Path')
 		);
 		expect(closeOtherButton).toBeTruthy();
 
@@ -3116,7 +3116,7 @@ describe('FileTab overlay menu', () => {
 		// Should show Close Tabs to Left option
 		const closeLeftButtons = screen.getAllByText('Close Tabs to Left');
 		const closeLeftButton = closeLeftButtons.find((btn) =>
-			btn.closest('.shadow-xl')?.querySelector('[data-testid="file-text-icon"]')
+			btn.closest('.shadow-xl')?.textContent?.includes('Copy File Path')
 		);
 		expect(closeLeftButton).toBeTruthy();
 
@@ -3223,7 +3223,7 @@ describe('FileTab overlay menu', () => {
 		// Should show Close Tabs to Right option
 		const closeRightButtons = screen.getAllByText('Close Tabs to Right');
 		const closeRightButton = closeRightButtons.find((btn) =>
-			btn.closest('.shadow-xl')?.querySelector('[data-testid="file-text-icon"]')
+			btn.closest('.shadow-xl')?.textContent?.includes('Copy File Path')
 		);
 		expect(closeRightButton).toBeTruthy();
 

src/renderer/components/TabBar.tsx

@@ -20,6 +20,7 @@ import {
 	Loader2,
 	ExternalLink,
 	FolderOpen,
+	FileText,
 } from 'lucide-react';
 import type { AITab, Theme, FilePreviewTab, UnifiedTab } from '../types';
 import { hasDraft } from '../utils/tabHelpers';