runable

lib/features/categories/domain/entities/category.dart

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+import 'package:equatable/equatable.dart';
+
+/// Category domain entity
+class Category extends Equatable {
+  final String id;
+  final String name;
+  final String? description;
+  final String? iconPath;
+  final String? color;
+  final int productCount;
+  final DateTime createdAt;
+
+  const Category({
+    required this.id,
+    required this.name,
+    this.description,
+    this.iconPath,
+    this.color,
+    required this.productCount,
+    required this.createdAt,
+  });
+
+  @override
+  List<Object?> get props => [
+        id,
+        name,
+        description,
+        iconPath,
+        color,
+        productCount,
+        createdAt,
+      ];
+}

lib/features/categories/domain/repositories/category_repository.dart

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+import 'package:dartz/dartz.dart';
+import '../../../../core/errors/failures.dart';
+import '../entities/category.dart';
+
+/// Category repository interface
+abstract class CategoryRepository {
+  /// Get all categories from cache
+  Future<Either<Failure, List<Category>>> getAllCategories();
+  
+  /// Get category by ID
+  Future<Either<Failure, Category>> getCategoryById(String id);
+  
+  /// Sync categories from remote
+  Future<Either<Failure, List<Category>>> syncCategories();
+}

lib/features/categories/domain/usecases/get_all_categories.dart

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+import 'package:dartz/dartz.dart';
+import '../../../../core/errors/failures.dart';
+import '../entities/category.dart';
+import '../repositories/category_repository.dart';
+
+/// Use case to get all categories
+class GetAllCategories {
+  final CategoryRepository repository;
+
+  GetAllCategories(this.repository);
+
+  Future<Either<Failure, List<Category>>> call() async {
+    return await repository.getAllCategories();
+  }
+}