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/e2e/helpers.ts

@@ -0,0 +1,13 @@
+import { expect, type Page } from '@playwright/test'
+
+export async function login(page: Page) {
+  const email = process.env.E2E_USERNAME
+  const password = process.env.E2E_PASSWORD
+  if (!email || !password) return false
+  await page.goto('/login')
+  await page.getByLabel(/email|username/i).first().fill(email)
+  await page.getByLabel(/password/i).fill(password)
+  await page.getByRole('button', { name: /sign in|log in/i }).click()
+  await expect(page).toHaveURL(/dashboard|workspace/, { timeout: 15_000 })
+  return true
+}