chore(backlog): 记录 g39 完成

.ua/backlog.json

@@ -674,8 +674,8 @@
       "title": "统一键盘焦点可见性 + 可访问性约定入文档",
       "motivation": "多数组件为自绘样式写了 outline:none，只有 14 处补了 focus-visible 光环，漏掉的组件键盘 Tab 过去完全看不出焦点在哪",
       "acceptance": "ui.css 顶部统一 [class^=ua-]:focus-visible 描边兜底（不引入硬编码色）；README 增「可访问性约定」章节；npm run check 全绿",
-      "status": "open",
-      "notes": "自补：既有组件可用性细节"
+      "status": "done",
+      "notes": "自补：a11y；避免组件各自 outline:none 丢失焦点指示"
     }
   ]
 }

.ua/iterations.log

@@ -83,3 +83,4 @@
 {"ts":"2026-10-26T11:47:48+08:00","id":"g36","result":"done","commit":"8ac71c4","summary":"新增 result 结果页：四档语义色 + 居中终态布局 + role=status，组件数 43→44"}
 {"ts":"2026-10-26T11:48:31+08:00","id":"g37","result":"done","commit":"3143a8b","summary":"新增 recipes.md 组合配方（表单校验提交/危险确认/表格分页批量/空态加载）并由 ua docs 追加进 llms-full"}
 {"ts":"2026-10-26T11:50:04+08:00","id":"g38","result":"done","commit":"82909c5","summary":"select 新增 searchable：弹层搜索框实时过滤、打开即聚焦、无命中提示，键盘只在可见项间移动；README 分组行补齐新组件"}
+{"ts":"2026-10-26T11:50:41+08:00","id":"g39","result":"done","commit":"fa8b0b8","summary":"ui.css 顶部统一 focus-visible 描边兜底（消费 --ua-color-accent），README 补可访问性约定章节"}