Task 8.2: Move src/app/page.tsx to src/app/app/page.tsx

- Create src/app/app/ directory
- Move the main app component (dashboard) to src/app/app/page.tsx
- Replace src/app/page.tsx with a redirect to /login
- Update tasks.md to mark 8.2 as complete

This establishes the /app workspace route for the authenticated app while the root / will redirect to login.

Co-Authored-By: Claude Sonnet 4.6 <noreply@anthropic.com>

openspec/changes/user-accounts/tasks.md

@@ -45,7 +45,7 @@
 ## 8. Frontend Routing Restructure
 
 - [x] 8.1 `[haiku]` Create `src/app/(public)/layout.tsx` — minimal layout for public pages (shared fonts/theme, no sidebar)
-- [ ] 8.2 `[haiku]` Move current `src/app/page.tsx` to `src/app/app/page.tsx` (workspace at `/app`)
+- [x] 8.2 `[haiku]` Move current `src/app/page.tsx` to `src/app/app/page.tsx` (workspace at `/app`)
 - [ ] 8.3 `[sonnet]` Create `src/app/app/layout.tsx` — protected layout with `SessionProvider`, user menu nav bar, sidebar with settings link
 - [ ] 8.4 `[haiku]` Update any hardcoded `/` links in existing components to `/app`