chore(backlog): 记录 g47 完成

.ua/backlog.json

@@ -732,6 +732,14 @@
       "acceptance": "新增 transfer（两栏由 dataSource 按 targetKeys 派生、逐栏搜索、全选含半选、禁用条目不参与、信号双向绑定）；manifest/docs/demo/README/计数同步；npm run check 全绿",
       "status": "done",
       "notes": "自补：组件补充；归属只存 key，搬运只改 targetKeys，不删条目"
+    },
+    {
+      "id": "g47",
+      "title": "新增 cascader 级联选择组件",
+      "motivation": "省市区、组织层级这类逐级下钻的选择场景目前只能靠多级 select 拼接，调用方得自己维护中间态与列联动",
+      "acceptance": "新增 cascader（多列联动、悬停下钻、点击提交、changeOnSelect、全键盘、Esc 入栈）；manifest/docs/demo/README/计数同步；npm run check 全绿",
+      "status": "done",
+      "notes": "自补：组件补充；浏览路径与已提交路径分离，避免悬停污染受控值"
     }
   ]
 }

.ua/iterations.log

@@ -91,3 +91,4 @@
 {"ts":"2026-10-26T12:00:19+08:00","id":"g44","result":"done","commit":"b50315b","summary":"accordion 标题 ↑↓/Home/End 环形导航，跳过禁用行"}
 {"ts":"2026-10-26T12:02:16+08:00","id":"g45","result":"done","commit":"0a0dc7a","summary":"overlay 新增 lockScroll 引用计数，模态层全关才还原 body 滚动"}
 {"ts":"2026-10-26T12:08:17+08:00","id":"g46","result":"done","commit":"1fe76e2","summary":"新增 transfer 穿梭框：两栏按 targetKeys 派生、逐栏搜索、全选含半选、禁用条目不参与，组件数 44→45"}
+{"ts":"2026-10-26T12:10:25+08:00","id":"g47","result":"done","commit":"d81b724","summary":"新增 cascader 级联选择：多列联动/悬停下钻/点击提交/changeOnSelect/全键盘，浏览路径与已提交路径分离，组件数 45→46"}