update favorite, chat

lib/features/products/presentation/widgets/product_card.dart

@@ -19,10 +19,6 @@ import 'package:worker/generated/l10n/app_localizations.dart';
 /// Displays product information in a card format.
 /// Includes image, name, price, stock status, favorite toggle, and add to cart button.
 class ProductCard extends ConsumerWidget {
-  final Product product;
-  final VoidCallback? onTap;
-  final VoidCallback? onAddToCart;
-
   const ProductCard({
     super.key,
     required this.product,
@@ -30,6 +26,10 @@ class ProductCard extends ConsumerWidget {
     this.onAddToCart,
   });
 
+  final Product product;
+  final VoidCallback? onTap;
+  final VoidCallback? onAddToCart;
+
   String _formatPrice(double price) {
     final formatter = NumberFormat('#,###', 'vi_VN');
     return '${formatter.format(price)}đ';
@@ -37,7 +37,7 @@ class ProductCard extends ConsumerWidget {
 
   @override
   Widget build(BuildContext context, WidgetRef ref) {
-    final l10n = AppLocalizations.of(context)!;
+    final l10n = AppLocalizations.of(context);
     final isFavorited = ref.watch(isFavoriteProvider(product.productId));
 
     return Card(
@@ -142,23 +142,29 @@ class ProductCard extends ConsumerWidget {
                     child: Material(
                       color: Colors.transparent,
                       child: InkWell(
-                        onTap: () {
-                          ref
+                        onTap: () async {
+                          // Capture current state before toggle
+                          final wasfavorited = isFavorited;
+
+                          // Toggle favorite
+                          await ref
                               .read(favoritesProvider.notifier)
                               .toggleFavorite(product.productId);
 
-                          // Show feedback
-                          ScaffoldMessenger.of(context).showSnackBar(
-                            SnackBar(
-                              content: Text(
-                                isFavorited
-                                    ? 'Đã xóa khỏi yêu thích'
-                                    : 'Đã thêm vào yêu thích',
+                          // Show feedback with correct message
+                          if (context.mounted) {
+                            ScaffoldMessenger.of(context).showSnackBar(
+                              SnackBar(
+                                content: Text(
+                                  wasfavorited
+                                      ? 'Đã xóa khỏi yêu thích'
+                                      : 'Đã thêm vào yêu thích',
+                                ),
+                                duration: const Duration(seconds: 1),
+                                behavior: SnackBarBehavior.floating,
                               ),
-                              duration: const Duration(seconds: 1),
-                              behavior: SnackBarBehavior.floating,
-                            ),
-                          );
+                            );
+                          }
                         },
                         borderRadius: BorderRadius.circular(20),
                         child: Container(
@@ -169,7 +175,7 @@ class ProductCard extends ConsumerWidget {
                             shape: BoxShape.circle,
                             boxShadow: [
                               BoxShadow(
-                                color: Colors.black.withOpacity(0.15),
+                                color: Colors.black.withValues(alpha: 0.15),
                                 blurRadius: 6,
                                 offset: const Offset(0, 2),
                               ),