update order detail

lib/features/products/presentation/pages/product_detail_page.dart

@@ -156,7 +156,7 @@ class _ProductDetailPageState extends ConsumerState<ProductDetailPage> {
     ScaffoldMessenger.of(context).showSnackBar(
       SnackBar(
         content: Text(
-          'Đã thêm $_quantity ${product.unit} ${product.name} vào giỏ hàng!',
+          'Đã thêm $_quantity m² ${product.name} vào giỏ hàng!',
         ),
         duration: const Duration(seconds: 2),
         action: SnackBarAction(
@@ -246,7 +246,7 @@ class _ProductDetailPageState extends ConsumerState<ProductDetailPage> {
                 right: 0,
                 child: StickyActionBar(
                   quantity: _quantity,
-                  unit: product.unit ?? 'm²',
+                  unit: 'm²',
                   conversionOfSm: product.conversionOfSm,
                   uomFromIntroAttributes: product.getIntroAttribute('UOM'),
                   onIncrease: _increaseQuantity,

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

@@ -220,7 +220,7 @@ class ProductCard extends ConsumerWidget {
 
                   // Price
                   Text(
-                    '${_formatPrice(product.effectivePrice)}/${product.unit}',
+                    '${_formatPrice(product.effectivePrice)}/m²',
                     style: const TextStyle(
                       fontSize: 16.0,
                       fontWeight: FontWeight.bold,

lib/features/products/presentation/widgets/product_detail/product_info_section.dart

@@ -61,7 +61,7 @@ class ProductInfoSection extends StatelessWidget {
             children: [
               // Current Price
               Text(
-                '${_formatPrice(product.basePrice)}/${product.unit ?? 'm²'}',
+                '${_formatPrice(product.basePrice)}/m²',
                 style: const TextStyle(
                   fontSize: 22,
                   fontWeight: FontWeight.w700,