feat: add category item widget

- Display category search result
- Added onTap snackbar message

Author: fulleni

lib/headlines-search/widgets/category_item_widget.dart

@@ -0,0 +1,31 @@
+import 'package:flutter/material.dart';
+import 'package:ht_shared/ht_shared.dart'; // Import Category model
+
+/// A simple widget to display a Category search result.
+class CategoryItemWidget extends StatelessWidget {
+  const CategoryItemWidget({required this.category, super.key});
+
+  final Category category;
+
+  @override
+  Widget build(BuildContext context) {
+    return ListTile(
+      title: Text(category.name),
+      subtitle: category.description != null
+          ? Text(
+              category.description!,
+              maxLines: 2,
+              overflow: TextOverflow.ellipsis,
+            )
+          : null,
+      // TODO(you): Implement onTap navigation if needed for categories
+      onTap: () {
+        // Example: Navigate to a filtered feed for this category
+        // context.goNamed('someCategoryFeedRoute', params: {'id': category.id});
+        ScaffoldMessenger.of(context).showSnackBar(
+          SnackBar(content: Text('Tapped on category: ${category.name}')),
+        );
+      },
+    );
+  }
+}