Initial commit: full-stack Bun + Elysia + React template

Elysia.js API with session-based auth (email/password + Google OAuth),
role system (USER/ADMIN/SUPER_ADMIN), Prisma + PostgreSQL, React 19
with Mantine UI, TanStack Router, dark theme, and comprehensive test
suite (unit, integration, E2E with Lightpanda).

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

src/frontend/hooks/useAuth.ts

@@ -0,0 +1,66 @@
+import { useMutation, useQuery, useQueryClient } from '@tanstack/react-query'
+import { useNavigate } from '@tanstack/react-router'
+
+export type Role = 'USER' | 'ADMIN' | 'SUPER_ADMIN'
+
+export interface User {
+  id: string
+  name: string
+  email: string
+  role: Role
+}
+
+async function apiFetch<T>(path: string, init?: RequestInit): Promise<T> {
+  const res = await fetch(path, { credentials: 'include', ...init })
+  if (!res.ok) {
+    const err = await res.json().catch(() => ({ error: 'Request failed' }))
+    throw new Error(err.error || `HTTP ${res.status}`)
+  }
+  return res.json()
+}
+
+export function useSession() {
+  return useQuery({
+    queryKey: ['auth', 'session'],
+    queryFn: () => apiFetch<{ user: User | null }>('/api/auth/session'),
+    retry: false,
+    staleTime: 30_000,
+  })
+}
+
+export function useLogin() {
+  const queryClient = useQueryClient()
+  const navigate = useNavigate()
+
+  return useMutation({
+    mutationFn: (data: { email: string; password: string }) =>
+      apiFetch<{ user: User }>('/api/auth/login', {
+        method: 'POST',
+        headers: { 'Content-Type': 'application/json' },
+        body: JSON.stringify(data),
+      }),
+    onSuccess: (data) => {
+      queryClient.setQueryData(['auth', 'session'], data)
+      // Super admin → dashboard, others → profile
+      if (data.user.role === 'SUPER_ADMIN') {
+        navigate({ to: '/dashboard' })
+      } else {
+        navigate({ to: '/profile' })
+      }
+    },
+  })
+}
+
+export function useLogout() {
+  const queryClient = useQueryClient()
+  const navigate = useNavigate()
+
+  return useMutation({
+    mutationFn: () =>
+      apiFetch<{ ok: boolean }>('/api/auth/logout', { method: 'POST' }),
+    onSuccess: () => {
+      queryClient.setQueryData(['auth', 'session'], { user: null })
+      navigate({ to: '/login' })
+    },
+  })
+}