rework ui

hartmann-foto-documentation-frontend/test/pages/login_widget_test.dart

@@ -36,7 +36,7 @@ void main() {
       await tester.pumpAndSettle();
 
       // Verify the login title is displayed (German localization)
-      expect(find.text('BILDERUPLOAD'), findsOneWidget);
+      expect(find.byKey(const Key('login_title')), findsOneWidget);
     });
 
     testWidgets('displays username and password fields', (WidgetTester tester) async {
@@ -162,7 +162,7 @@ void main() {
       when(mockLoginController.authenticate('testuser', 'wrongpassword'))
           .thenAnswer((_) async => (jwtTokenPairDto: null));
 
-      await pumpAppConfig(tester, GlobalRouter.pathLogin);
+      await pumpApp(tester, const LoginWidget());
       await tester.pumpAndSettle();
 
       // Enter credentials