feat(ui): add login page, club picker, and dashboard
Implements Task 21: Login Page + First-Login Club Picker + Dashboard
New pages:
- Login page: Sign in with Keycloak button, clean centered layout
- Select club page: Club selection cards for multi-club users
- Dashboard: Summary with task/shift counts and quick links
Key features:
- Login delegates to Keycloak via NextAuth signIn('keycloak')
- Club picker shows cards with name + sport type
- Clicking club → setActiveClub() → redirects to /dashboard
- Dashboard shows active club name, open tasks count, upcoming shifts count
- Quick action links to /tasks and /shifts pages
- TanStack Query hooks with proper filters (status: 'Open', future shifts only)
TDD:
- 2 login tests (component export, signIn exists)
- 2 select-club tests (component export, useTenant exists)
- 4 dashboard tests (component export, hooks exist)
Task 21 tests: 8/8 pass. Build succeeds (9 routes registered).
Note: 38 pre-existing tests from Tasks 10,18-20 fail due to Bun+vitest
test infrastructure issues (vi.mocked() not supported, localStorage mock).
This is technical debt to be addressed separately.
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