add detail, fetch products, categories

lib/features/categories/presentation/widgets/category_card.dart

@@ -1,5 +1,6 @@
 import 'package:flutter/material.dart';
 import '../../domain/entities/category.dart';
+import '../pages/category_detail_page.dart';
 
 /// Category card widget
 class CategoryCard extends StatelessWidget {
@@ -20,7 +21,13 @@ class CategoryCard extends StatelessWidget {
       color: color,
       child: InkWell(
         onTap: () {
-          // TODO: Filter products by category
+          // Navigate to category detail page
+          Navigator.push(
+            context,
+            MaterialPageRoute(
+              builder: (context) => CategoryDetailPage(category: category),
+            ),
+          );
         },
         child: Padding(
           padding: const EdgeInsets.all(16.0),