fixing android build

lib/screens/gateway/gateway_web_screen.dart

@@ -3,7 +3,7 @@ import 'package:flutter_dotenv/flutter_dotenv.dart';
 import 'package:go_router/go_router.dart';
 import 'package:qpay/models/responsive_policy.dart';
 import 'package:qpay/screens/gateway/gateway_controller.dart';
-import 'package:web/web.dart' as web;
+import 'package:qpay/browser.dart';
 
 class GatewayWebScreen extends StatefulWidget {
   const GatewayWebScreen({super.key});
@@ -50,7 +50,7 @@ class _GatewayWebScreenState extends State<GatewayWebScreen> {
     final transactionId =
         controller.transactionController.model.confirmationData['id'];
     if (transactionId != null) {
-      web.window.localStorage.setItem(
+      Browser.localStorage.setItem(
         'pendingTransactionId',
         transactionId.toString(),
       );
@@ -60,7 +60,7 @@ class _GatewayWebScreenState extends State<GatewayWebScreen> {
     // After payment, the gateway will redirect back to this app's host.
     // index.html then reads the saved transaction ID and navigates to
     // /poll/:id so the app can immediately start polling for the result.
-    web.window.location.href = url;
+    Browser.location.href = url;
   }
 
   @override