chore(backlog): 记录 g132 完成

.ua/backlog.json

@@ -1418,7 +1418,7 @@
       "title": "@提及输入补 mentions 组件",
       "motivation": "评论 / 协作场景要 @ 选人，目前只能 textarea + 自己接 autoComplete，光标定位与插入逻辑重复实现",
       "acceptance": "mentions 在 @ 触发后按光标位置弹候选，↑↓/Enter/Tab 选择、Esc 关闭，选中插入文本并回调 onSelect；受控 value 信号；样式只消费 --ua-*；文档与演示同步；npm run check 全绿",
-      "status": "open",
+      "status": "done",
       "notes": "自补：组件补充方向"
     },
     {

.ua/iterations.log

@@ -176,3 +176,4 @@
 {"ts":"2026-10-26T15:18:37+08:00","id":"g129","result":"done","commit":"ea2a846","summary":"新增 typography 排版文本组件（标题 h1-h5/段落/行内 + 语义色/装饰位/对齐 + 多行截断 + 复制按钮），组件 60→61"}
 {"ts":"2026-10-26T15:20:05+08:00","id":"g130","result":"done","commit":"23d1e06","summary":"新增 grid 栅格容器（columns 固定列 / min auto-fit 自适应 / gutter / align / dense，窄屏单列），组件 61→62"}
 {"ts":"2026-10-26T15:21:23+08:00","id":"g131","result":"done","commit":"d9559ae","summary":"新增 floatButton（左下/右下停靠、label 胶囊与纯图标圆形、badge 角标、tooltip 兼 aria-label、reduced-motion 兜底），组件 62→63"}
+{"ts":"2026-10-26T15:22:59+08:00","id":"g132","result":"done","commit":"9d0c195","summary":"新增 mentions（@ 触发弹层、名字/关键词过滤、↑↓ 环形移动、Enter/Tab 选中、Esc 只收本层、按光标替换写回信号），组件 63→64"}