refactor(account): update import statement in saved_headlines_page.dart

- Remove unused import of HeadlineItemWidget
- Update shared import to only include FeedCore widget

Author: fulleni

lib/account/view/saved_headlines_page.dart

@@ -6,7 +6,7 @@ import 'package:flutter_news_app_mobile_client_full_source_code/app/bloc/app_blo
 // HeadlineItemWidget import removed
 import 'package:flutter_news_app_mobile_client_full_source_code/l10n/l10n.dart';
 import 'package:flutter_news_app_mobile_client_full_source_code/router/routes.dart';
-import 'package:flutter_news_app_mobile_client_full_source_code/shared/shared.dart';
+import 'package:flutter_news_app_mobile_client_full_source_code/shared/widgets/feed_core/feed_core.dart';
 import 'package:go_router/go_router.dart';
 import 'package:ui_kit/ui_kit.dart';