add refresh token

lib/core/network/dio_client.dart

@@ -1,13 +1,16 @@
 import 'package:dio/dio.dart';
 import '../constants/api_constants.dart';
+import '../storage/secure_storage.dart';
 import 'api_interceptor.dart';
+import 'refresh_token_interceptor.dart';
 
 /// Dio HTTP client configuration
 class DioClient {
   late final Dio _dio;
   String? _authToken;
+  final SecureStorage? secureStorage;
 
-  DioClient() {
+  DioClient({this.secureStorage}) {
     _dio = Dio(
       BaseOptions(
         baseUrl: ApiConstants.fullBaseUrl,
@@ -34,6 +37,17 @@ class DioClient {
         },
       ),
     );
+
+    // Add refresh token interceptor (if secureStorage is provided)
+    if (secureStorage != null) {
+      _dio.interceptors.add(
+        RefreshTokenInterceptor(
+          dio: _dio,
+          secureStorage: secureStorage!,
+        ),
+      );
+      print('🔧 DioClient: Refresh token interceptor added');
+    }
   }
 
   Dio get dio => _dio;