refactor(agent): 优化收藏功能代码实现

- 前端移除未使用的 ArrowRightOutlined 导入
- 优化智能体列表排序逻辑，避免修改原数组
- 后端使用 Stream API 简化收藏智能体 ID 获取逻辑

yudao-module-tik/src/main/java/cn/iocoder/yudao/module/tik/muye/aiagent/service/AiAgentFavoriteServiceImpl.java

@@ -55,11 +55,9 @@ public class AiAgentFavoriteServiceImpl implements AiAgentFavoriteService {
     @Override
     public Set<Long> getFavoriteAgentIds(Long userId) {
         List<AiAgentFavoriteDO> favorites = aiAgentFavoriteMapper.selectListByUserId(userId);
-        Set<Long> agentIds = new HashSet<>();
-        for (AiAgentFavoriteDO favorite : favorites) {
-            agentIds.add(favorite.getAgentId());
-        }
-        return agentIds;
+        return favorites.stream()
+                .map(AiAgentFavoriteDO::getAgentId)
+                .collect(java.util.stream.Collectors.toSet());
     }
 
     @Override