handle exceptions by throwing, not with results

lib/login_page.dart

@@ -63,15 +63,16 @@ class _LoginPageState extends State<LoginPage> {
       _error = null;
     });
     final apiClient = ApiClient(baseUrl: "$serverUrl/api");
-    final loginResult = await apiClient.login(email, password);
-    if (loginResult.isOk()) {
+    try {
+      await apiClient.login(email, password);
+
       await _storageHelper.writeSecure(SecureStorageKey.url, serverUrl);
       await _storageHelper.writeSecure(SecureStorageKey.jwt, apiClient.token!);
       await _storageHelper.writeSecure(SecureStorageKey.email, email);
       await _navigateToMainPage();
-    } else {
+    } catch (e) {
       setState(() {
-        _error = "Login failed.\n${loginResult.error()}";
+        _error = "Login failed.\n$e";
       });
     }
   }