refactor(feed): use shared Category model

- Removed ht_categories_client dep
- Using ht_shared package

Author: fulleni

lib/headlines-feed/view/category_filter_page.dart

@@ -4,12 +4,12 @@
 import 'package:flutter/material.dart';
 import 'package:flutter_bloc/flutter_bloc.dart';
 import 'package:go_router/go_router.dart';
-import 'package:ht_categories_client/ht_categories_client.dart';
-// Removed repository import: import 'package:ht_categories_repository/ht_categories_repository.dart';
 import 'package:ht_main/headlines-feed/bloc/categories_filter_bloc.dart'; // Import the BLoC
 import 'package:ht_main/l10n/l10n.dart';
 import 'package:ht_main/shared/constants/constants.dart';
 import 'package:ht_main/shared/widgets/widgets.dart'; // For loading/error widgets
+import 'package:ht_shared/ht_shared.dart'
+    show Category; // Import Category model
 
 /// {@template category_filter_page}
 /// A page dedicated to selecting news categories for filtering headlines.