QoL changes

lib/services/authservice.dart

@@ -1,15 +1,13 @@
 import 'package:flutter/foundation.dart';
-import 'package:flutter_secure_storage/flutter_secure_storage.dart';
 import 'package:mileograph_flutter/objects/objects.dart';
 import 'package:mileograph_flutter/services/apiService.dart';
+import 'package:mileograph_flutter/services/tokenStorageService.dart';
 
 class AuthService extends ChangeNotifier {
   final ApiService api;
-  static const _tokenKey = 'auth_token';
   bool _restoring = false;
 
-  // secure storage instance
-  final FlutterSecureStorage _storage = const FlutterSecureStorage();
+  final TokenStorageService _tokenStorage = TokenStorageService();
 
   AuthService({required this.api});
 
@@ -74,10 +72,10 @@ class AuthService extends ChangeNotifier {
 
   Future<void> tryRestoreSession() async {
     if (_restoring || _user != null) return;
-    _restoring = true;
-    try {
-      // read token from secure storage
-      final token = await _storage.read(key: _tokenKey);
+      _restoring = true;
+      try {
+      // read token from secure storage (with fallback)
+      final token = await _tokenStorage.getToken();
       if (token == null || token.isEmpty) return;
 
       final userResponse = await api.get(
@@ -103,11 +101,11 @@ class AuthService extends ChangeNotifier {
   }
 
   Future<void> _persistToken(String token) async {
-    await _storage.write(key: _tokenKey, value: token);
+    await _tokenStorage.setToken(token);
   }
 
   Future<void> _clearToken() async {
-    await _storage.delete(key: _tokenKey);
+    await _tokenStorage.clearToken();
   }
 
   Future<void> register({