chore(backlog): 记录 g15 完成

.ua/backlog.json

@@ -482,7 +482,7 @@
       "title": "toast 悬停暂停自动关闭",
       "motivation": "toast 到点即消失，用户来不及读完长文案；悬停暂停是主流反馈组件的常规可用性细节",
       "acceptance": "showToast 悬停时暂停倒计时、移出后按剩余时长继续；duration 语义不变；manifest 与 demo 说明同步；npm run check 全绿",
-      "status": "open",
+      "status": "done",
       "notes": "自补：既有组件可用性细节"
     }
   ]

.ua/iterations.log

@@ -59,3 +59,4 @@
 {"ts":"2026-10-26T10:29:17+08:00","id":"g14","result":"done","commit":"b3c3bc7","summary":"演示站侧边目录加关键字过滤框：输入即筛、空态提示、Esc 清空，滚动高亮不受影响"}
 {"ts":"2026-10-26T10:31:15+08:00","id":"g13","result":"done","commit":"90d3b64","summary":"新增 ua changelog：按提交类型分组生成 CHANGELOG.md，支持 --check 幂等校验"}
 {"ts":"2026-10-26T10:52:00+08:00","id":"g11","result":"done","commit":"00a7b90","summary":"新增 flip() 翻转判定：popover/tooltip/select/menu 打开时按视口空间自动上下翻转，弹层不再溢出被裁切"}
+{"ts":"2026-10-26T10:55:35+08:00","id":"g15","result":"done","commit":"85988f0","summary":"toast 悬停暂停倒计时、移出按剩余时长继续，长文案不再来不及读"}