style(userfront): format flutter files to satisfy CI

userfront/lib/features/auth/presentation/login_screen.dart

@@ -352,7 +352,8 @@ class _LoginScreenState extends ConsumerState<LoginScreen>
       // IMPORTANT: If backend returned a token during OIDC flow, save it to fix login state.
       final jwt = res['sessionJwt'] ?? res['token'] ?? token;
       if (jwt != null && jwt.isNotEmpty) {
-        final provider = res['provider'] as String? ?? AuthTokenStore.getProvider();
+        final provider =
+            res['provider'] as String? ?? AuthTokenStore.getProvider();
         await AuthNotifier.instance.onLoginSuccess(jwt, provider: provider);
       }