添加视频循环模式和下载功能，优化页面元数据和样式

app/tasks/page.tsx

@@ -34,6 +34,14 @@ export default function TasksPage() {
   const [openDetails, setOpenDetails] = useState<Set<string>>(new Set());
   const [, setTick] = useState(0); // 用于强制更新计时显示
 
+  // 设置页面标题
+  useEffect(() => {
+    document.title = "任务管理 - 抖歪";
+    return () => {
+      document.title = "抖歪 - 记录当下时代";
+    };
+  }, []);
+
   const inProgressUrls = useMemo(
     () => new Set(tasks.filter(t => t.status === "pending" || t.status === "running").map(t => t.url)),
     [tasks]