update loaing

docs/md/CART_DEBOUNCE.md

@@ -219,7 +219,7 @@ class _CartPageState extends ConsumerState<CartPage> {
             }
           : null,
       child: _isSyncing
-          ? CircularProgressIndicator() // Show loading while syncing
+          ? const CustomLoadingIndicator() // Show loading while syncing
           : Text('Tiến hành đặt hàng'),
     );
   }