fix: use isLiked/isFavorited from API data for initial state

- Get store state separately from API data
- Merge strategy: store takes priority (for optimistic updates), fallback to API data
- Use item.isLiked and item.isFavorited for initial state
- Match the implementation pattern used in home page

app/(tabs)/video.tsx

@@ -85,11 +85,17 @@ export const VideoItem = memo(({ item, videoHeight }: { item: TemplateDetail; vi
     const heartOpacity = useRef(new Animated.Value(0)).current
     const lastTap = useRef(0)
 
-    // 从 store 获取状态
-    const liked = useTemplateLiked(item.id) ?? false
-    const favorited = useTemplateFavorited(item.id) ?? false
-    const likeCount = useTemplateLikeCount(item.id) ?? item.likeCount
-    const favoriteCount = useTemplateFavoriteCount(item.id) ?? item.favoriteCount
+    // 从 store 获取状态（用于乐观更新）
+    const storeLiked = useTemplateLiked(item.id)
+    const storeFavorited = useTemplateFavorited(item.id)
+    const storeLikeCount = useTemplateLikeCount(item.id)
+    const storeFavoriteCount = useTemplateFavoriteCount(item.id)
+
+    // 合并策略：Store 优先（乐观更新），否则使用 API 数据
+    const liked = storeLiked ?? item.isLiked ?? false
+    const favorited = storeFavorited ?? item.isFavorited ?? false
+    const likeCount = storeLikeCount ?? item.likeCount ?? 0
+    const favoriteCount = storeFavoriteCount ?? item.favoriteCount ?? 0
 
     // 使用 hooks 获取操作函数
     const { like: onLike, unlike: onUnlike, loading: likeLoading } = useTemplateLike(item.id, item.likeCount)