fallback sign in flow

src/contexts/AuthContext.tsx

@@ -10,6 +10,8 @@ import {
   onAuthStateChanged,
   setPersistence,
   signInWithPopup,
+  signInWithRedirect,
+  getRedirectResult,
   signOut as firebaseSignOut,
   type User,
 } from 'firebase/auth'
@@ -43,6 +45,7 @@ type AuthContextValue = {
   mongoUser: MongoUser | null
   loading: boolean
   secretKey: Uint8Array | null
+  authError: string | null
   signInWithGoogle: () => Promise<void>
   signOut: () => Promise<void>
   refreshMongoUser: () => Promise<void>
@@ -56,6 +59,7 @@ export function AuthProvider({ children }: { children: ReactNode }) {
   const [mongoUser, setMongoUser] = useState<MongoUser | null>(null)
   const [secretKey, setSecretKey] = useState<Uint8Array | null>(null)
   const [loading, setLoading] = useState(true)
+  const [authError, setAuthError] = useState<string | null>(null)
 
   // Initialize encryption keys on login
   async function initializeEncryption(authUser: User) {
@@ -151,6 +155,12 @@ export function AuthProvider({ children }: { children: ReactNode }) {
   }
 
   useEffect(() => {
+    // Handle returning from a redirect sign-in (mobile flow)
+    getRedirectResult(auth).catch((error) => {
+      console.error('[Auth] Redirect sign-in error:', error)
+      setAuthError(error instanceof Error ? error.message : 'Sign-in failed')
+    })
+
     const unsubscribe = onAuthStateChanged(auth, async (u) => {
       setUser(u)
       if (u) {
@@ -170,8 +180,19 @@ export function AuthProvider({ children }: { children: ReactNode }) {
   }, [])
 
   async function signInWithGoogle() {
+    setAuthError(null)
     await setPersistence(auth, browserLocalPersistence)
+    try {
       await signInWithPopup(auth, googleProvider)
+    } catch (err: unknown) {
+      const code = (err as { code?: string })?.code
+      if (code === 'auth/popup-blocked') {
+        // Popup was blocked (common on iOS Safari / Android WebViews) — fall back to redirect
+        await signInWithRedirect(auth, googleProvider)
+      } else {
+        throw err
+      }
+    }
   }
 
   async function refreshMongoUser() {
@@ -205,6 +226,7 @@ export function AuthProvider({ children }: { children: ReactNode }) {
     mongoUser,
     secretKey,
     loading,
+    authError,
     signInWithGoogle,
     signOut,
     refreshMongoUser,

src/pages/LoginPage.tsx

@@ -5,7 +5,7 @@ import { GoogleSignInButton } from '../components/GoogleSignInButton'
 import { TreeAnimation } from '../components/TreeAnimation'
 
 export default function LoginPage() {
-  const { user, loading, signInWithGoogle } = useAuth()
+  const { user, loading, signInWithGoogle, authError } = useAuth()
   const navigate = useNavigate()
   const [signingIn, setSigningIn] = useState(false)
   const [error, setError] = useState<string | null>(null)
@@ -63,8 +63,8 @@ export default function LoginPage() {
           <div className="lp__actions">
             <GoogleSignInButton loading={signingIn} onClick={handleGoogleSignIn} />
             <p className="lp__privacy">🔒 End-to-end encrypted. We never read your entries.</p>
-            {error && (
+            {(error || authError) && (
-              <p className="lp__error" role="alert">{error}</p>
+              <p className="lp__error" role="alert">{error || authError}</p>
             )}
           </div>
         </div>