fix(dashboard): correct API call for fetching recent headlines

Moves the `sortBy` and `sortOrder` parameters from the `query` map to the dedicated named arguments in the `readAllBy` method call within the `DashboardBloc`.

This aligns the call with the repository's API contract and resolves the `BadRequestException` thrown by the `HtDataInMemory` client, which was incorrectly receiving sorting parameters as filter keys.

Author: fulleni

lib/dashboard/bloc/dashboard_bloc.dart

@@ -38,8 +38,9 @@ class DashboardBloc extends Bloc<DashboardEvent, DashboardState> {
       ] = await Future.wait([
         _dashboardSummaryRepository.read(id: 'summary'),
         _appConfigRepository.read(id: 'app_config'),
-        _headlinesRepository.readAllByQuery(
-          const {'sortBy': 'createdAt', 'sortOrder': 'desc'},
+        _headlinesRepository.readAll(
+          sortBy: 'createdAt',
+          sortOrder: SortOrder.desc,
           limit: 5,
         ),
       ]);