feat: implement comments and activity panel in workspace

- Added CommentsPanel component for managing comments on documents.
- Integrated comment creation, deletion, and resolution functionalities.
- Implemented activity tracking for document interactions.
- Enhanced SketchPage with editing and saving capabilities.
- Introduced template management API endpoints for creating, sharing, and deleting templates.
- Added runtime validation report for frontend and backend.
- Created GettingStartedPanel for user onboarding with template options.
- Implemented Playwright E2E tests for accessibility and export functionality.

frontend/package.json

@@ -6,7 +6,8 @@
   "scripts": {
     "dev": "vite",
     "build": "tsc -b && vite build",
-    "preview": "vite preview"
+    "preview": "vite preview",
+    "test:e2e": "playwright test"
   },
   "dependencies": {
     "framer-motion": "^12.4.7",
@@ -22,6 +23,7 @@
     "@vitejs/plugin-react": "^4.3.4",
     "tailwindcss": "^4.0.9",
     "typescript": "~5.7.2",
-    "vite": "^6.2.0"
+    "vite": "^6.2.0",
+    "@playwright/test": "^1.64.1"
   }
 }