iter(g106): 滚动监听改为卸载自清理

packages/skin/ui/src/tour.ts

@@ -3,6 +3,7 @@ import type { Signal } from '@ui-arch/frame';
 import { pushOverlay } from './overlay.js';
 import { button } from './button.js';
 import type { TourHandle, TourProps } from './types.js';
+import { watchViewport } from './watch.js';
 
 /*** 引导漫游：聚光框 + 说明卡逐步指引，聚光用超大 box-shadow 挖洞省掉遮罩层，Esc / 跳过可退出 ***/
 export function tour(props: TourProps): TourHandle {
@@ -84,8 +85,7 @@ export function tour(props: TourProps): TourHandle {
   };
 
   const onViewport = (): void => { if (idx() >= 0) place(); }; // 滚动/缩放后重算位置
-  window.addEventListener('resize', onViewport);
-  window.addEventListener('scroll', onViewport, { passive: true });
+  watchViewport(root, window, onViewport); // 节点脱离文档即自摘监听：引导层反复挂载也不累积
 
   return {
     el: root,