add refresh token

lib/core/providers/core_providers.dart

@@ -7,10 +7,12 @@ part 'core_providers.g.dart';
 /// Provider for DioClient (singleton)
 ///
 /// This is the global HTTP client used across the entire app.
-/// It's configured with interceptors, timeout settings, and auth token injection.
+/// It's configured with interceptors, timeout settings, auth token injection,
+/// and automatic token refresh on 401 errors.
 @Riverpod(keepAlive: true)
 DioClient dioClient(Ref ref) {
-  return DioClient();
+  final storage = ref.watch(secureStorageProvider);
+  return DioClient(secureStorage: storage);
 }
 
 /// Provider for SecureStorage (singleton)