Output login errors to user

lib/api.dart

@@ -5,6 +5,7 @@ import 'package:flutter/foundation.dart';
 import 'package:http/http.dart' as http;
 import 'package:logging/logging.dart';
 import 'package:path_provider/path_provider.dart'; // For cache storage
+import 'package:sheetless/utility.dart';
 
 import 'sheet.dart';
 
@@ -15,7 +16,7 @@ class ApiClient {
 
   ApiClient({required this.baseUrl, this.token});
 
-  Future<bool> login(String username, String password) async {
+  Future<Result<void>> login(String username, String password) async {
     log.info("Logging in...");
     try {
       final url = '$baseUrl/login';
@@ -28,14 +29,19 @@ class ApiClient {
       if (response.statusCode == 200) {
         token = jsonDecode(response.body);
         log.info('Login successful');
-        return true;
+        return Result.ok(null);
       } else {
         log.warning('Login failed: ${response.statusCode}, ${response.body}');
+        return Result.error(
+          Exception(
+            "Response code ${response.statusCode}\nResponse: ${response.body}",
+          ),
+        );
       }
-    } catch (e) {
+    } on Exception catch (e) {
       log.warning('Error during login', e);
+      return Result.error(e);
     }
-    return false;
   }
 
   void logout() {