update info

lib/features/cart/presentation/pages/cart_page.dart

@@ -43,12 +43,9 @@ class _CartPageState extends ConsumerState<CartPage> {
     });
   }
 
-  @override
-  void dispose() {
-    // Force sync any pending quantity updates before leaving cart page
-    ref.read(cartProvider.notifier).forceSyncPendingUpdates();
-    super.dispose();
-  }
+  // Note: Sync is handled in PopScope.onPopInvokedWithResult for back navigation
+  // and in checkout button handler for checkout flow.
+  // No dispose() method needed - using ref.read() in dispose() is unsafe.
 
   @override
   Widget build(BuildContext context) {
@@ -63,13 +60,21 @@ class _CartPageState extends ConsumerState<CartPage> {
     final itemCount = cartState.itemCount;
     final hasSelection = cartState.selectedCount > 0;
 
-    return Scaffold(
-      backgroundColor: const Color(0xFFF4F6F8),
-      appBar: AppBar(
-        leading: IconButton(
-          icon: const FaIcon(FontAwesomeIcons.arrowLeft, color: Colors.black, size: 20),
-          onPressed: () => context.pop(),
-        ),
+    return PopScope(
+      // Intercept back navigation to sync pending updates
+      onPopInvokedWithResult: (didPop, result) async {
+        if (didPop) {
+          // Sync any pending quantity updates before leaving the page
+          await ref.read(cartProvider.notifier).forceSyncPendingUpdates();
+        }
+      },
+      child: Scaffold(
+        backgroundColor: const Color(0xFFF4F6F8),
+        appBar: AppBar(
+          leading: IconButton(
+            icon: const FaIcon(FontAwesomeIcons.arrowLeft, color: Colors.black, size: 20),
+            onPressed: () => context.pop(),
+          ),
         title: Text(
           'Giỏ hàng ($itemCount)',
           style: const TextStyle(color: Colors.black),
@@ -144,6 +149,7 @@ class _CartPageState extends ConsumerState<CartPage> {
                         ),
                       ],
                     ),
+      ),
     );
   }