feat(following): 新增追剧三栏与双列网格

test/widget_test.dart

@@ -117,7 +117,7 @@ void main() {
 
     await tester.tap(find.byKey(const Key('tab-follow')));
     await tester.pumpAndSettle();
-    expect(find.byKey(const Key('favorites-page')), findsOneWidget);
+    expect(find.byKey(const Key('following-page')), findsOneWidget);
     await tester.tap(find.byKey(const Key('tab-mine')));
     await tester.pumpAndSettle();
     expect(find.byKey(const Key('mine-menu')), findsOneWidget);