Enhance Space Management Features with Tag Assignment Improvements:

- Introduced UUID for ProductAllocation to ensure unique identification.
- Refactored AssignTagsDialog to manage tag assignments and validation more effectively, including error handling for empty tags and duplicate tag usage.
- Updated AssignTagsTable to support dynamic product allocation management and improved UI interactions.
- Enhanced AddDeviceTypeWidget to maintain selected products and handle increment/decrement actions, improving user experience during device type selection.
- Added AssignTagsErrorMessages widget for better error visibility in tag assignment process.

lib/pages/space_management_v2/modules/space_details/domain/models/space_details_model.dart

@@ -2,6 +2,7 @@ import 'package:equatable/equatable.dart';
 import 'package:syncrow_web/pages/space_management_v2/modules/products/domain/models/product.dart';
 import 'package:syncrow_web/pages/space_management_v2/modules/tags/domain/models/tag.dart';
 import 'package:syncrow_web/utils/constants/assets.dart';
+import 'package:uuid/uuid.dart';
 
 class SpaceDetailsModel extends Equatable {
   final String uuid;
@@ -31,8 +32,8 @@ class SpaceDetailsModel extends Equatable {
       spaceName: json['spaceName'] as String,
       icon: json['icon'] as String,
       productAllocations: (json['productAllocations'] as List)
-              .map((e) => ProductAllocation.fromJson(e as Map<String, dynamic>))
-              .toList(),
+          .map((e) => ProductAllocation.fromJson(e as Map<String, dynamic>))
+          .toList(),
       subspaces: (json['subspaces'] as List)
           .map((e) => Subspace.fromJson(e as Map<String, dynamic>))
           .toList(),
@@ -70,16 +71,19 @@ class SpaceDetailsModel extends Equatable {
 }
 
 class ProductAllocation extends Equatable {
+  final String uuid;
   final Product product;
   final Tag tag;
 
   const ProductAllocation({
+    required this.uuid,
     required this.product,
     required this.tag,
   });
 
   factory ProductAllocation.fromJson(Map<String, dynamic> json) {
     return ProductAllocation(
+      uuid: json['uuid'] as String? ?? const Uuid().v4(),
       product: Product.fromJson(json['product'] as Map<String, dynamic>),
       tag: Tag.fromJson(json['tag'] as Map<String, dynamic>),
     );
@@ -87,23 +91,26 @@ class ProductAllocation extends Equatable {
 
   Map<String, dynamic> toJson() {
     return {
+      'uuid': uuid,
       'product': product.toJson(),
       'tag': tag.toJson(),
     };
   }
 
   ProductAllocation copyWith({
+    String? uuid,
     Product? product,
     Tag? tag,
   }) {
     return ProductAllocation(
+      uuid: uuid ?? this.uuid,
       product: product ?? this.product,
       tag: tag ?? this.tag,
     );
   }
 
   @override
-  List<Object?> get props => [product, tag];
+  List<Object?> get props => [uuid, product, tag];
 }
 
 class Subspace extends Equatable {