chore(backlog): 记录 g40 完成

.ua/backlog.json

@@ -682,8 +682,8 @@
       "title": "修表单双提交：button 显式 type + Enter 提交",
       "motivation": "button() 不写 type，放进 <form> 里默认是 submit：点提交会先跑 click 回调再触发原生 submit（onSubmit 触发两次），点「重置」还会顺带提交表单",
       "acceptance": "ButtonProps 增 type（缺省 button）；form 内提交按钮用 submit、重置用 button；单行输入框 Enter 等同提交且 textarea 不受影响；文档同步；npm run check 全绿",
-      "status": "open",
-      "notes": "自补：既有组件缺陷修复"
+      "status": "done",
+      "notes": "自补：缺陷修复；textarea 保留换行语义"
     }
   ]
 }

.ua/iterations.log

@@ -84,3 +84,4 @@
 {"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"}
+{"ts":"2026-10-26T11:51:41+08:00","id":"g40","result":"done","commit":"d685f66","summary":"button 增 type（缺省 button）修掉表单内 click+submit 双触发，form 交按钮走原生 submit 并支持单行输入 Enter 提交"}