chore(backlog): 记录 g96 完成

.ua/backlog.json

@@ -1131,7 +1131,7 @@
       "motivation": "drawer 的 placement 只有 left/right，移动端最常见的「底部弹层」只能拿 modal 或者自己写 fixed 容器凑，既丢了焦点陷阱与 Esc 栈，样式也不统一",
       "acceptance": "placement 扩到 'left' | 'right' | 'top' | 'bottom'；上下滑出时 width 语义变为高度、横向自动铺满（max-width 放开），入场位移走 translateY，四条方位共用同一套遮罩/焦点陷阱/Esc 栈；文档与演示（底部抽屉实例）同步；npm run check 全绿",
       "notes": "自补：组件能力补齐；只加 CSS 分支与一个三元表达尺寸，逻辑零改动",
-      "status": "open"
+      "status": "done"
     }
   ]
 }

.ua/iterations.log

@@ -140,3 +140,4 @@
 {"ts":"2026-10-26T13:12:28+08:00","id":"g93","result":"done","commit":"90bba1c","summary":"tree 新增 searchable：命中保留父链并临时展开，隐藏枝退出键盘遍历"}
 {"ts":"2026-10-26T13:13:08+08:00","id":"g94","result":"done","commit":"03eab7a","summary":"recipes 增补配方 5：数据表受控分页联动 + 导出全量行 + 列宽拖拽"}
 {"ts":"2026-10-26T13:14:05+08:00","id":"g95","result":"done","commit":"7e0612e","summary":"statistic 新增 countdown 模式：每秒 DD 天 HH:MM:SS，到点或卸载自动停表"}
+{"ts":"2026-10-26T13:15:00+08:00","id":"g96","result":"done","commit":"306fd90","summary":"drawer placement 扩到四向，上下滑出按高度、横向铺满，复用焦点陷阱与 Esc 栈"}