46bbac355b
Implements Task 18: App Layout + Club-Switcher + Auth Guard New components: - TenantContext: Manages activeClubId state with TanStack Query - QueryProvider: TanStack Query client wrapper (60s stale time) - AuthGuard: Auth + tenant redirect logic (unauthenticated → /login) - ClubSwitcher: shadcn DropdownMenu for switching clubs - SignOutButton: Simple sign out button - Protected layout: Sidebar navigation + top bar with ClubSwitcher Key features: - Fetches clubs from /api/clubs/me - Auto-loads activeClubId from localStorage - Sets X-Tenant-Id cookie on club switch - Invalidates all queries on club switch - Redirect logic: unauthenticated → /login, 0 clubs → message, 1 club → auto-select, >1 clubs + no active → /select-club TDD: - 6 AuthGuard tests (loading, unauthenticated, 0 clubs, 1 club, multiple clubs, authenticated) - 3 ClubSwitcher tests (renders current club, lists all clubs, calls setActiveClub on selection) Dependencies: - Added @tanstack/react-query All tests pass (25/25). Build succeeds.