feat: Add pending deletions service to app providers

- Inject PendingDeletionsService into the app's provider list
- Enable dependency injection for PendingDeletionsService in the App widget

Author: fulleni

lib/app/view/app.dart

@@ -139,6 +139,7 @@ class App extends StatelessWidget {
               headlinesFilterBloc: context.read<HeadlinesFilterBloc>(),
               topicsFilterBloc: context.read<TopicsFilterBloc>(),
               sourcesFilterBloc: context.read<SourcesFilterBloc>(),
+              pendingDeletionsService: context.read<PendingDeletionsService>(),
             ),
           ),
           BlocProvider(