fix checkout/cart

lib/features/cart/presentation/widgets/checkout_submit_button.dart

@@ -34,61 +34,45 @@ class CheckoutSubmitButton extends StatelessWidget {
 
   @override
   Widget build(BuildContext context) {
-    return Padding(
+    return Container(
+      width: double.infinity,
       padding: const EdgeInsets.symmetric(horizontal: AppSpacing.md),
-      child: Column(
-        children: [
-          // Terms Agreement Text
-          const Text(
-            'Bằng việc đặt hàng, bạn đồng ý với các điều khoản và điều kiện của chúng tôi',
-            style: TextStyle(fontSize: 12, color: AppColors.grey500),
-            textAlign: TextAlign.center,
-          ),
-
-          const SizedBox(height: AppSpacing.md),
-
-          // Place Order / Send Negotiation Button
-          SizedBox(
-            width: double.infinity,
-            child: ElevatedButton(
-              onPressed: () {
-                // Validate address is selected
-                if (selectedAddress == null) {
-                  ScaffoldMessenger.of(context).showSnackBar(
-                    const SnackBar(
-                      content: Text('Vui lòng chọn địa chỉ giao hàng'),
-                      backgroundColor: AppColors.danger,
-                      duration: Duration(seconds: 2),
-                    ),
-                  );
-                  return;
-                }
-
-                if (formKey.currentState?.validate() ?? false) {
-                  _handlePlaceOrder(context);
-                }
-              },
-              style: ElevatedButton.styleFrom(
-                backgroundColor: needsNegotiation
-                    ? AppColors.warning
-                    : AppColors.primaryBlue,
-                foregroundColor: Colors.white,
-                padding: const EdgeInsets.symmetric(vertical: 16),
-                elevation: 0,
-                shape: RoundedRectangleBorder(
-                  borderRadius: BorderRadius.circular(AppRadius.button),
-                ),
+      child: ElevatedButton(
+        onPressed: () {
+          // Validate address is selected
+          if (selectedAddress == null) {
+            ScaffoldMessenger.of(context).showSnackBar(
+              const SnackBar(
+                content: Text('Vui lòng chọn địa chỉ giao hàng'),
+                backgroundColor: AppColors.danger,
+                duration: Duration(seconds: 2),
               ),
-              child: Text(
-                needsNegotiation ? 'Gửi yêu cầu đàm phán' : 'Đặt hàng',
-                style: const TextStyle(
-                  fontSize: 16,
-                  fontWeight: FontWeight.w600,
-                ),
-              ),
-            ),
+            );
+            return;
+          }
+
+          if (formKey.currentState?.validate() ?? false) {
+            _handlePlaceOrder(context);
+          }
+        },
+        style: ElevatedButton.styleFrom(
+          backgroundColor: needsNegotiation
+              ? AppColors.warning
+              : AppColors.primaryBlue,
+          foregroundColor: Colors.white,
+          padding: const EdgeInsets.symmetric(vertical: 16),
+          elevation: 0,
+          shape: RoundedRectangleBorder(
+            borderRadius: BorderRadius.circular(AppRadius.button),
           ),
-        ],
+        ),
+        child: Text(
+          needsNegotiation ? 'Gửi yêu cầu đàm phán' : 'Đặt hàng',
+          style: const TextStyle(
+            fontSize: 16,
+            fontWeight: FontWeight.w600,
+          ),
+        ),
       ),
     );
   }

lib/features/cart/presentation/widgets/order_summary_section.dart

@@ -105,11 +105,11 @@ class OrderSummarySection extends StatelessWidget {
 
   /// Build cart item with conversion details on two lines
   Widget _buildCartItemWithConversion(Map<String, dynamic> item) {
-    // Mock conversion data (in real app, this comes from CartItemData)
-    final quantity = item['quantity'] as int;
-    final quantityM2 = quantity.toDouble(); // User input
-    final quantityConverted = (quantityM2 * 1.008 * 100).ceil() / 100; // Rounded up
-    final boxes = (quantityM2 * 2.8).ceil(); // Tiles count
+    // Get real conversion data from CartItemData
+    final quantity = item['quantity'] as double;
+    final quantityConverted = item['quantityConverted'] as double;
+    final boxes = item['boxes'] as int;
+    final price = item['price'] as double;
 
     return Padding(
       padding: const EdgeInsets.only(bottom: 12),
@@ -136,7 +136,7 @@ class OrderSummarySection extends StatelessWidget {
                 const SizedBox(height: 4),
                 // Line 2: Conversion details (muted text)
                 Text(
-                  '$quantityM2 m² ($boxes viên / ${quantityConverted.toStringAsFixed(2)} m²)',
+                  '${quantity.toStringAsFixed(2)} m² ($boxes viên / ${quantityConverted.toStringAsFixed(2)} m²)',
                   style: const TextStyle(
                     fontSize: 13,
                     color: AppColors.grey500,
@@ -148,11 +148,9 @@ class OrderSummarySection extends StatelessWidget {
 
           const SizedBox(width: 12),
 
-          // Price (right side)
+          // Price (right side) - using converted quantity for accurate billing
           Text(
-            _formatCurrency(
-              ((item['price'] as int) * quantityConverted).toDouble(),
-            ),
+            _formatCurrency(price * quantityConverted),
             style: const TextStyle(
               fontSize: 14,
               fontWeight: FontWeight.w600,

lib/features/cart/presentation/widgets/price_negotiation_section.dart

@@ -12,9 +12,9 @@ import 'package:worker/core/theme/colors.dart';
 ///
 /// Allows user to request price negotiation instead of direct order.
 class PriceNegotiationSection extends HookWidget {
-  final ValueNotifier<bool> needsNegotiation;
 
   const PriceNegotiationSection({super.key, required this.needsNegotiation});
+  final ValueNotifier<bool> needsNegotiation;
 
   @override
   Widget build(BuildContext context) {