add notification, fix appbar,fix style subscription

lib/presentation/viewmodel/notifications_bloc.dart

@@ -0,0 +1,34 @@
+import 'package:flutter_bloc/flutter_bloc.dart';
+import 'dart:developer' as dev;
+import '../../domain/usecase/get_notifications_usecase.dart';
+import '../event/notifications_event.dart';
+import '../state/notifications_state.dart';
+
+class NotificationsBloc extends Bloc<NotificationsEvent, NotificationsState> {
+  final GetNotificationsUsecase _getNotificationsUsecase;
+
+  NotificationsBloc(this._getNotificationsUsecase) : super(const NotificationsState()) {
+    on<NotificationsFetchRequested>(_onFetchRequested);
+  }
+
+  Future<void> _onFetchRequested(
+      NotificationsFetchRequested event,
+      Emitter<NotificationsState> emit,
+      ) async {
+    emit(state.copyWith(status: NotificationsStatus.loading));
+
+    try {
+      final notifications = await _getNotificationsUsecase();
+      emit(state.copyWith(
+        status: NotificationsStatus.success,
+        notifications: notifications,
+      ));
+    } catch (e) {
+      dev.log('NotificationsBloc: Ошибка загрузки: $e');
+      emit(state.copyWith(
+        status: NotificationsStatus.failure,
+        errorMessage: e.toString(),
+      ));
+    }
+  }
+}