chore(backlog): 记录 g27 完成

.ua/backlog.json

@@ -578,8 +578,8 @@
       "title": "弹层 Esc 栈：多弹层只关最上层",
       "motivation": "modal 与 drawer 各自往 document 挂 keydown，叠加打开时一次 Esc 会把所有弹层全关；实例销毁也不摘监听",
       "acceptance": "modal/drawer 共用 overlay.ts 的 Esc 栈，后开先关；栈空自动摘全局监听；npm run check 全绿",
-      "status": "open",
-      "notes": "自补：既有组件可用性细节"
+      "status": "done",
+      "notes": "自补：既有组件可用性细节；去掉两处各自挂的 document keydown"
     }
   ]
 }

.ua/iterations.log

@@ -71,3 +71,4 @@
 {"ts":"2026-10-26T11:33:41+08:00","id":"g24","result":"done","commit":"e6b4a84","summary":"新增 list 列表组件：header/footer 外壳 + avatar/title/description/extra 条目，空数组回落空状态，组件数 38→39"}
 {"ts":"2026-10-26T11:34:59+08:00","id":"g25","result":"done","commit":"563730c","summary":"新增 ua tokens 命令（--json 可选）与 MCP get_tokens 工具，llms-full 令牌名统一 kebab-case"}
 {"ts":"2026-10-26T11:36:38+08:00","id":"g26","result":"done","commit":"6ad0765","summary":"verify 新增令牌引用校验（拼错变量名即失败），ua tokens 与 llms-full 统一从 tokens.css 取令牌"}
+{"ts":"2026-10-26T11:37:50+08:00","id":"g27","result":"done","commit":"d80e132","summary":"新增 overlay.ts Esc 栈：modal/drawer 后开先关，栈空自动摘全局监听"}