feat(video_calls): fixed online indicator and in app notifications for video call

test/features/chat/models/chat_user_model_test.dart

@@ -28,12 +28,14 @@ void main() {
       expect(model.profilePhotoUrl, isNull);
     });
 
-    test('fromJson создает ChatUserModel из JSON', () {
+    test('fromJson creates ChatUserModel from JSON', () {
       final json = {
         'id': 1,
         'name': 'User Name',
         'slug': 'user-slug',
         'profile_photo_url': 'https://example.com/photo.jpg',
+        'is_online': true,
+        'last_seen_text': 'был(а) недавно',
       };
 
       final model = ChatUserModel.fromJson(json);
@@ -42,6 +44,8 @@ void main() {
       expect(model.name, 'User Name');
       expect(model.slug, 'user-slug');
       expect(model.profilePhotoUrl, 'https://example.com/photo.jpg');
+      expect(model.isOnline, isTrue);
+      expect(model.lastSeenText, 'был(а) недавно');
     });
 
     test('fromJson создает ChatUserModel из JSON без фото', () {

test/features/video_calls/presentation/video_call_session_cubit_test.dart

@@ -220,7 +220,7 @@ void main() {
       expect(cubit.state.callStageEntered, isTrue);
     });
 
-    test('outgoing call keeps lobby until callee joins', () async {
+    test('outgoing call stays on connecting lobby until callee joins', () async {
       when(
         mockManager.startCall(
           conversationUuid: anyNamed('conversationUuid'),