fix(profile): refresh bottom-nav avatar on account switch

Reset ProfileAvatarCubit and user-scoped feed, chat and notification state so stale data from the previous account cannot be rendered. Refresh the avatar when the stored token changes and rebuild nav tabs when the profile identity or consultant role changes.

Refs: #1113

lib/features/notifications/presentation/notifications_cubit/notifications_cubit.dart

@@ -16,6 +16,11 @@ class NotificationsCubit extends Cubit<NotificationsState> {
   StreamSubscription? _newNotificationsSubscription;
   NotificationsCubit({required this.wsManager, required this.notificationsRepository}) : super(const NotificationsState.empty());
 
+  void reset() {
+    _notifications.clear();
+    if (!isClosed) emit(const NotificationsState.empty());
+  }
+
   Future<void> connectToWebSocket() async {
     try {
       await _newNotificationsSubscription?.cancel();