fix checkout/cart

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

@@ -285,8 +285,19 @@ class _CartPageState extends ConsumerState<CartPage> {
                               _isSyncing = false;
                             });
 
-                            // Navigate to checkout
-                            context.push(RouteNames.checkout);
+                            // Get selected CartItemData objects
+                            // Pass complete CartItemData to preserve conversion calculations
+                            final selectedCartItems = cartState.items
+                                .where((item) =>
+                                    cartState.selectedItems[item.product.productId] == true)
+                                .toList();
+
+                            // Navigate to checkout with CartItemData
+                            // Checkout page will fetch fresh pricing from API
+                            context.push(
+                              RouteNames.checkout,
+                              extra: {'cartItems': selectedCartItems},
+                            );
                           }
                         }
                       : null,