feat: auth-aware UI and role-based access control (#67)

## Summary

- Add `is_admin` column to users table with Alembic migration and a `require_admin` FastAPI dependency that protects all admin-facing write endpoints (games, pokemon, evolutions, bosses, routes CRUD)
- Expose admin status to frontend via user API and update AuthContext to fetch/store `isAdmin` after login
- Make navigation menu auth-aware (different links for logged-out, logged-in, and admin users) and protect frontend routes with `ProtectedRoute` and `AdminRoute` components, preserving deep-linking through redirects
- Fix test reliability: `drop_all` before `create_all` to clear stale PostgreSQL enums from interrupted test runs
- Fix test auth: add `admin_client` fixture and use valid UUID for mock user so tests pass with new admin-protected endpoints

## Test plan

- [x] All 252 backend tests pass
- [ ] Verify non-admin users cannot access admin write endpoints (games, pokemon, evolutions, bosses CRUD)
- [ ] Verify admin users can access admin endpoints normally
- [ ] Verify navigation shows correct links for logged-out, logged-in, and admin states
- [ ] Verify `/admin/*` routes redirect non-admin users with a toast
- [ ] Verify `/runs/new` and `/genlockes/new` redirect unauthenticated users to login, then back after auth

🤖 Generated with [Claude Code](https://claude.com/claude-code)

Reviewed-on: #67
Co-authored-by: Julian Tabel <juliantabel.jt@gmail.com>
Co-committed-by: Julian Tabel <juliantabel.jt@gmail.com>

frontend/src/components/AdminRoute.tsx

@@ -0,0 +1,35 @@
+import { useEffect, useRef } from 'react'
+import { Navigate, useLocation } from 'react-router-dom'
+import { toast } from 'sonner'
+import { useAuth } from '../contexts/AuthContext'
+
+export function AdminRoute({ children }: { children: React.ReactNode }) {
+  const { user, loading, isAdmin } = useAuth()
+  const location = useLocation()
+  const toastShownRef = useRef(false)
+
+  useEffect(() => {
+    if (!loading && user && !isAdmin && !toastShownRef.current) {
+      toastShownRef.current = true
+      toast.error('Admin access required')
+    }
+  }, [loading, user, isAdmin])
+
+  if (loading) {
+    return (
+      <div className="min-h-screen flex items-center justify-center">
+        <div className="animate-spin rounded-full h-8 w-8 border-b-2 border-accent-500" />
+      </div>
+    )
+  }
+
+  if (!user) {
+    return <Navigate to="/login" state={{ from: location }} replace />
+  }
+
+  if (!isAdmin) {
+    return <Navigate to="/" replace />
+  }
+
+  return <>{children}</>
+}

frontend/src/components/Layout.test.tsx

@@ -2,62 +2,108 @@ import { render, screen } from '@testing-library/react'
 import userEvent from '@testing-library/user-event'
 import { MemoryRouter } from 'react-router-dom'
 import { Layout } from './Layout'
-import { AuthProvider } from '../contexts/AuthContext'
 
 vi.mock('../hooks/useTheme', () => ({
   useTheme: () => ({ theme: 'dark' as const, toggle: vi.fn() }),
 }))
 
+const mockUseAuth = vi.fn()
+vi.mock('../contexts/AuthContext', () => ({
+  useAuth: () => mockUseAuth(),
+}))
+
+const loggedOutAuth = {
+  user: null,
+  session: null,
+  loading: false,
+  isAdmin: false,
+  signInWithEmail: vi.fn(),
+  signUpWithEmail: vi.fn(),
+  signInWithGoogle: vi.fn(),
+  signInWithDiscord: vi.fn(),
+  signOut: vi.fn(),
+}
+
+const adminAuth = {
+  ...loggedOutAuth,
+  user: { email: 'admin@example.com' },
+  session: {},
+  isAdmin: true,
+}
+
 function renderLayout(initialPath = '/') {
   return render(
     <MemoryRouter initialEntries={[initialPath]}>
-      <AuthProvider>
-        <Layout />
-      </AuthProvider>
+      <Layout />
     </MemoryRouter>
   )
 }
 
 describe('Layout', () => {
-  it('renders all desktop navigation links', () => {
-    renderLayout()
-    expect(screen.getAllByRole('link', { name: /new run/i })[0]).toBeInTheDocument()
-    expect(screen.getAllByRole('link', { name: /my runs/i })[0]).toBeInTheDocument()
-    expect(screen.getAllByRole('link', { name: /genlockes/i })[0]).toBeInTheDocument()
-    expect(screen.getAllByRole('link', { name: /stats/i })[0]).toBeInTheDocument()
-    expect(screen.getAllByRole('link', { name: /admin/i })[0]).toBeInTheDocument()
+  describe('when logged out', () => {
+    beforeEach(() => mockUseAuth.mockReturnValue(loggedOutAuth))
+
+    it('renders logged-out navigation links', () => {
+      renderLayout()
+      expect(screen.getAllByRole('link', { name: /^home$/i })[0]).toBeInTheDocument()
+      expect(screen.getAllByRole('link', { name: /^runs$/i })[0]).toBeInTheDocument()
+      expect(screen.getAllByRole('link', { name: /genlockes/i })[0]).toBeInTheDocument()
+      expect(screen.getAllByRole('link', { name: /stats/i })[0]).toBeInTheDocument()
+    })
+
+    it('does not show authenticated links', () => {
+      renderLayout()
+      expect(screen.queryByRole('link', { name: /new run/i })).not.toBeInTheDocument()
+      expect(screen.queryByRole('link', { name: /my runs/i })).not.toBeInTheDocument()
+      expect(screen.queryByRole('link', { name: /admin/i })).not.toBeInTheDocument()
+    })
+
+    it('shows sign-in link', () => {
+      renderLayout()
+      expect(screen.getByRole('link', { name: /sign in/i })).toBeInTheDocument()
+    })
+  })
+
+  describe('when logged in as admin', () => {
+    beforeEach(() => mockUseAuth.mockReturnValue(adminAuth))
+
+    it('renders authenticated navigation links', () => {
+      renderLayout()
+      expect(screen.getAllByRole('link', { name: /new run/i })[0]).toBeInTheDocument()
+      expect(screen.getAllByRole('link', { name: /my runs/i })[0]).toBeInTheDocument()
+      expect(screen.getAllByRole('link', { name: /genlockes/i })[0]).toBeInTheDocument()
+      expect(screen.getAllByRole('link', { name: /stats/i })[0]).toBeInTheDocument()
+      expect(screen.getAllByRole('link', { name: /admin/i })[0]).toBeInTheDocument()
+    })
+
+    it('shows the mobile dropdown when the hamburger is clicked', async () => {
+      renderLayout()
+      const hamburger = screen.getByRole('button', { name: /toggle menu/i })
+      await userEvent.click(hamburger)
+      expect(screen.getAllByRole('link', { name: /my runs/i }).length).toBeGreaterThan(1)
+    })
   })
 
   it('renders the brand logo link', () => {
+    mockUseAuth.mockReturnValue(loggedOutAuth)
     renderLayout()
     expect(screen.getByRole('link', { name: /ant/i })).toBeInTheDocument()
   })
 
   it('renders the theme toggle button', () => {
+    mockUseAuth.mockReturnValue(loggedOutAuth)
     renderLayout()
     expect(screen.getAllByRole('button', { name: /switch to light mode/i })[0]).toBeInTheDocument()
   })
 
   it('initially hides the mobile dropdown menu', () => {
+    mockUseAuth.mockReturnValue(loggedOutAuth)
     renderLayout()
-    // Mobile menu items exist in DOM but menu is hidden; the mobile dropdown
-    // only appears inside the sm:hidden block after state toggle.
-    // The hamburger button should be present.
     expect(screen.getByRole('button', { name: /toggle menu/i })).toBeInTheDocument()
   })
 
-  it('shows the mobile dropdown when the hamburger is clicked', async () => {
-    renderLayout()
-    const hamburger = screen.getByRole('button', { name: /toggle menu/i })
-    await userEvent.click(hamburger)
-    // After click, the menu open state adds a dropdown with nav links
-    // We can verify the menu is open by checking a class change or that
-    // the nav links appear in the mobile dropdown section.
-    // The mobile dropdown renders navLinks in a div inside sm:hidden
-    expect(screen.getAllByRole('link', { name: /my runs/i }).length).toBeGreaterThan(1)
-  })
-
   it('renders the footer with PokeDB attribution', () => {
+    mockUseAuth.mockReturnValue(loggedOutAuth)
     renderLayout()
     expect(screen.getByRole('link', { name: /pokedb/i })).toBeInTheDocument()
   })

frontend/src/components/Layout.tsx

@@ -1,16 +1,8 @@
-import { useState } from 'react'
+import { useState, useMemo } from 'react'
 import { Link, Outlet, useLocation } from 'react-router-dom'
 import { useTheme } from '../hooks/useTheme'
 import { useAuth } from '../contexts/AuthContext'
 
-const navLinks = [
-  { to: '/runs/new', label: 'New Run' },
-  { to: '/runs', label: 'My Runs' },
-  { to: '/genlockes', label: 'Genlockes' },
-  { to: '/stats', label: 'Stats' },
-  { to: '/admin', label: 'Admin' },
-]
-
 function NavLink({
   to,
   active,
@@ -136,9 +128,34 @@ function UserMenu({ onAction }: { onAction?: () => void }) {
 export function Layout() {
   const [menuOpen, setMenuOpen] = useState(false)
   const location = useLocation()
+  const { user, isAdmin } = useAuth()
+
+  const navLinks = useMemo(() => {
+    if (!user) {
+      // Logged out: Home, Runs, Genlockes, Stats
+      return [
+        { to: '/', label: 'Home' },
+        { to: '/runs', label: 'Runs' },
+        { to: '/genlockes', label: 'Genlockes' },
+        { to: '/stats', label: 'Stats' },
+      ]
+    }
+    // Logged in: New Run, My Runs, Genlockes, Stats
+    const links = [
+      { to: '/runs/new', label: 'New Run' },
+      { to: '/runs', label: 'My Runs' },
+      { to: '/genlockes', label: 'Genlockes' },
+      { to: '/stats', label: 'Stats' },
+    ]
+    // Admin gets Admin link
+    if (isAdmin) {
+      links.push({ to: '/admin', label: 'Admin' })
+    }
+    return links
+  }, [user, isAdmin])
 
   function isActive(to: string) {
-    if (to === '/runs/new') return location.pathname === '/runs/new'
+    if (to === '/' || to === '/runs/new') return location.pathname === to
     return location.pathname.startsWith(to)
   }
 

frontend/src/components/index.ts

@@ -1,3 +1,4 @@
+export { AdminRoute } from './AdminRoute'
 export { CustomRulesDisplay } from './CustomRulesDisplay'
 export { ProtectedRoute } from './ProtectedRoute'
 export { EggEncounterModal } from './EggEncounterModal'