fix: 调整追剧加号卡片顺序

lib/pages/following/following_page.dart

@@ -269,10 +269,10 @@ class _FavoritesGrid extends StatelessWidget {
           itemCount: controller.cards.length + 1,
           empty: const SizedBox.shrink(),
           itemBuilder: (context, index) {
-            if (index == 0) {
+            if (index == controller.cards.length) {
               return FollowingAddCard(onTap: onGoHome);
             }
-            final drama = controller.cards[index - 1];
+            final drama = controller.cards[index];
             final episode = drama.episodes.isEmpty
                 ? 1
                 : drama.episodes.first.number;