update order detail

lib/features/products/domain/entities/product.dart

@@ -22,7 +22,6 @@ class Product {
     required this.specifications,
     this.itemGroupName,
     this.brand,
-    this.unit,
     this.conversionOfSm,
     this.introAttributes,
     required this.isActive,
@@ -64,9 +63,6 @@ class Product {
   /// Brand name
   final String? brand;
 
-  /// Unit of measurement (e.g., "m²", "viên", "hộp")
-  final String? unit;
-
   /// Conversion factor for Square Meter UOM (tiles per m²)
   /// Used to calculate: Số viên = Số lượng × conversionOfSm
   final double? conversionOfSm;
@@ -154,7 +150,6 @@ class Product {
     Map<String, dynamic>? specifications,
     String? itemGroupName,
     String? brand,
-    String? unit,
     double? conversionOfSm,
     List<Map<String, String>>? introAttributes,
     bool? isActive,
@@ -175,7 +170,6 @@ class Product {
       specifications: specifications ?? this.specifications,
       itemGroupName: itemGroupName ?? this.itemGroupName,
       brand: brand ?? this.brand,
-      unit: unit ?? this.unit,
       conversionOfSm: conversionOfSm ?? this.conversionOfSm,
       introAttributes: introAttributes ?? this.introAttributes,
       isActive: isActive ?? this.isActive,
@@ -203,7 +197,6 @@ class Product {
         other.basePrice == basePrice &&
         other.itemGroupName == itemGroupName &&
         other.brand == brand &&
-        other.unit == unit &&
         other.isActive == isActive &&
         other.isFeatured == isFeatured &&
         other.erpnextItemCode == erpnextItemCode;
@@ -218,7 +211,6 @@ class Product {
       basePrice,
       itemGroupName,
       brand,
-      unit,
       isActive,
       isFeatured,
       erpnextItemCode,