chore: backlog 记录 d27/d28 done

.ua/backlog.json

@@ -261,6 +261,16 @@
       "id": "d26",
       "title": "select 键盘导航：↑↓ 环形移动、Home/End 跳转、Esc 回焦触发器",
       "status": "done"
+    },
+    {
+      "id": "d27",
+      "title": "modal 焦点陷阱：Tab/Shift+Tab 回绕、role=dialog/aria-modal、关闭归还焦点",
+      "status": "done"
+    },
+    {
+      "id": "d28",
+      "title": "drawer 焦点陷阱：Tab/Shift+Tab 回绕、关闭归还焦点（对齐 modal）",
+      "status": "done"
     }
   ]
 }

.ua/iterations.log

@@ -31,3 +31,5 @@
 {"time": "2026-10-23T17:05:46+08:00", "id": "d24", "result": "done", "summary": "重写 README（定位/快速开始/28 组件/目录/门禁/Agent 接入/流水线），组件清单做成标记区块并由 ua verify 校验防漂移；负向测试通过，check 全绿"}
 {"time": "2026-10-23T17:06:17+08:00", "id": "d25", "result": "done", "summary": "menu 条目新增 shortcut 快捷键提示（右侧 kbd 灰字，两端对齐 + 单行省略，不绑按键）；demo/manifest/llms 同步，check 全绿"}
 {"ts": "2026-10-23T09:09:16+00:00", "round": 26, "id": "d26", "result": "done", "commit": "82f48aa", "summary": "select 键盘导航：↑↓ 环形移动、Home/End 跳转、Esc 回焦触发器"}
+{"ts": "2026-10-23T09:11:42+00:00", "round": 27, "id": "d27", "result": "done", "commit": "fac74a3", "summary": "modal 焦点陷阱 + dialog 语义"}
+{"ts": "2026-10-23T09:11:42+00:00", "round": 28, "id": "d28", "result": "done", "commit": "", "summary": "drawer 焦点陷阱对齐 modal"}