chore(backlog): 记录 g290 完成

.ua/backlog.json

@@ -2996,6 +2996,15 @@
       "status": "done",
       "domain": "tune",
       "notes": ""
+    },
+    {
+      "id": "g290",
+      "title": "抽出 trackShift 并接到下拉弹层",
+      "motivation": "g289 把滚动跟随写在了 tooltip 里，可下拉族（select / autoComplete / cascader / datePicker / timePicker / colorPicker / menu / multiSelect）用的是同一个 flip，同样只在打开那一瞬算一次——同一个缺陷被复制在九处，修一处等于只修了一份。先把监听逻辑抽成公共件，tooltip 用法不变（还顺手删掉了刚写的一整段重复代码），再给用量最大的 select 接上。",
+      "acceptance": "position.ts 新增 trackShift(onShift)：捕获阶段监听 scroll + resize、rAF 节流、返回摘除函数并撤销待执行帧；tooltip 改用它（删除内联的 bound/raf/bind/unbind 五个变量，文件反而短了）；select 展开期间接上 trackShift，收起即摘；两个组件的文档 steps 同步口径；npm run check 全绿",
+      "status": "done",
+      "domain": "tooling",
+      "notes": ""
     }
   ]
 }

.ua/iterations.log

@@ -334,3 +334,4 @@
 {"ts":"2026-10-26T23:17:28+08:00","id":"g287","result":"done","commit":"f388464","summary":"noticeBar 关闭先淡出再隐藏（减少动效只淡出），窄屏改换行停跑马灯，demo 文案据实修正"}
 {"ts":"2026-10-26T23:18:19+08:00","id":"g288","result":"done","commit":"003dae3","summary":"verify 的 steps 下限 3→4 并在报错里点明四步口径，badge/divider/kbd/highlight 补真实第四条，AGENTS 两处同步"}
 {"ts":"2026-10-26T23:19:03+08:00","id":"g289","result":"done","commit":"8dc7201","summary":"tooltip 出场期间挂 scroll(捕获)/resize 监听，rAF 节流重算翻转，收起即摘"}
+{"ts":"2026-10-26T23:20:06+08:00","id":"g290","result":"done","commit":"9e72607","summary":"position.ts 新增 trackShift（捕获 scroll + resize、rAF 节流、可撤销帧），tooltip 改用它去掉内联重复，select 展开期间接上"}