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/playwright.config.ts

@@ -0,0 +1,12 @@
+import { defineConfig } from '@playwright/test'
+
+export default defineConfig({
+  testDir: './e2e',
+  timeout: 30_000,
+  use: {
+    baseURL: process.env.E2E_BASE_URL || 'http://127.0.0.1:5173',
+    headless: true,
+    trace: 'retain-on-failure',
+  },
+  reporter: [['list']],
+})