fix bugs and set progress and toast for my items server events

lib/providers/my_items.dart

@@ -256,6 +256,17 @@ class MyItemProvider extends ChangeNotifier {
   //   }
   // }
 
+  bool isloadingButton = false;
+  void resetLoadingButton() {
+    isloadingButton = false;
+    notifyListeners();
+  }
+
+  void setLoadingButton() {
+    isloadingButton = true;
+    notifyListeners();
+  }
+
   Future<void> transferItems(String itemId, String userId) async {
     var response = await http.post(
       Uri.parse(Url.transferItems(itemId)),