test(frontend): add Playwright E2E test setup

Implement Task 17: Frontend Test Infrastructure - Playwright

Configuration:
- playwright.config.ts: baseURL localhost:3000, Chromium only
- Screenshot on failure, trace on first retry
- Auto-start webServer (bun dev) if not running
- Test directory: ./e2e/

Smoke Test:
- e2e/smoke.spec.ts: Navigate to / and assert page title
- Verifies Next.js app loads successfully

Package Updates:
- Added @playwright/test@^1.58.2
- Added test:e2e script to run Playwright tests
- Chromium browser (v1208) installed

Note: Vitest setup was completed in Task 10
Build: TypeScript checks pass, 1 test discovered
Pattern: Standard Playwright configuration for Next.js

.sisyphus/plans/club-work-manager.md

@@ -1606,7 +1606,7 @@ Max Concurrent: 6 (Wave 1)
   - Files: `backend/src/WorkClub.Api/Endpoints/Clubs/*.cs`, `backend/src/WorkClub.Application/Members/*.cs`
   - Pre-commit: `dotnet test backend/tests/ --filter "Clubs|Members"`
 
-- [ ] 17. Frontend Test Infrastructure (Vitest + RTL + Playwright)
+- [x] 17. Frontend Test Infrastructure (Vitest + RTL + Playwright)
 
   **What to do**:
   - Install and configure Vitest: `bun add -D vitest @testing-library/react @testing-library/jest-dom @vitejs/plugin-react jsdom`