fix(dashboard): update headlines sort order

- Change headlines sort option from 'createdAt' to 'updatedAt'
- This ensures that the most recently updated headlines appear first

Author: fulleni

lib/dashboard/bloc/dashboard_bloc.dart

@@ -32,7 +32,7 @@ class DashboardBloc extends Bloc<DashboardEvent, DashboardState> {
         _dashboardSummaryRepository.read(id: kDashboardSummaryId),
         _headlinesRepository.readAll(
           pagination: const PaginationOptions(limit: 5),
-          sort: const [SortOption('createdAt', SortOrder.desc)],
+          sort: const [SortOption('updatedAt', SortOrder.desc)],
         ),
       ]);