chore(backlog): 记录 g159 完成

.ua/backlog.json

@@ -1628,6 +1628,14 @@
       "acceptance": "datePicker 新增 presets 入参（仅区间模式渲染）：每项支持 days 相对今天或 from/to 绝对日期，点击即写入 value/end、按 min/max 钳制并收起；演示页区间示例带三档预设；manifest props 表与步骤、llms-full 同步；npm run check 全绿。",
       "notes": "",
       "status": "done"
+    },
+    {
+      "id": "g159",
+      "title": "多选下拉支持标签折叠",
+      "motivation": "multiSelect 的 max 放开后标签会把输入区挤到换行，窄栏（筛选栏 / 表单侧栏）里选中五六个就撑破布局，调用方只能自己截断数组、却因此拿不到真实值。",
+      "acceptance": "multiSelect 新增 maxTagCount：前 N 枚标签照常渲染与删除，其余折成虚线「+N」（title 给全量、点击展开弹层，含 aria-label）；演示页加一枚预置 3 项的折叠实例；manifest props 表与步骤、llms-full 同步；npm run check 全绿。",
+      "notes": "",
+      "status": "done"
     }
   ]
 }

.ua/iterations.log

@@ -203,3 +203,4 @@
 {"ts":"2026-10-26T15:55:38+08:00","id":"g156","result":"done","commit":"bbebb70","summary":"ua tokens <子串> 过滤令牌"}
 {"ts":"2026-10-26T15:56:57+08:00","id":"g157","result":"done","commit":"c2412fb","summary":"新增配方 10：暗色主题切换与 color-scheme 同步"}
 {"ts":"2026-10-26T16:00:46+08:00","id":"g158","result":"done","commit":"638f623","summary":"datePicker 新增 presets 快捷区间（days 相对今天 / from-to 绝对日期，min-max 钳制）"}
+{"ts":"2026-10-26T16:02:24+08:00","id":"g159","result":"done","commit":"312e801","summary":"multiSelect 新增 maxTagCount 标签折叠（+N 虚线条目，悬停看全量、点击展开）"}