fixed login problem

lib/view_models/auth_view_model.dart

@@ -50,6 +50,8 @@ class AuthViewModel with ChangeNotifier {
     _errorMessage = null;
     notifyListeners();
 
+    await localLogout();
+
     final result = await _authRepository.login(
       username: usernameController.text.trim(),
       password: passwordController.text.trim(),