feat(app): 展示真实点赞与评论计数

test/comment/drama_comments_sheet_test.dart

@@ -62,11 +62,13 @@ void main() {
     await _pumpSheet(tester, repository: repository);
     expect(find.text('Great episode'), findsOneWidget);
     expect(find.byKey(const Key('comment-list-load-more')), findsOneWidget);
+    expect(find.byKey(const Key('comment-count-label')), findsNothing);
 
     await tester.tap(find.byKey(const Key('comment-list-load-more')));
     await tester.pumpAndSettle();
 
     expect(find.text('Second page'), findsOneWidget);
+    expect(find.text('Comments · 2'), findsOneWidget);
     expect(repository.pageCalls.last.cursor, '10');
   });