chore(backlog): 记录 g125 完成

.ua/backlog.json

@@ -1363,7 +1363,7 @@
       "motivation": "开关切换常伴随后端写入（改配置、提交设置）：请求在途时用户可以连续拨动，最后一次点击覆盖前面的状态，业务方只能自己在 onChange 里加标志位手动锁",
       "acceptance": "SwitchProps 新增 loading（布尔或信号）：加载中锁定交互（disabled 同值语义）、滑块换成转圈（reduced-motion 静态化为实心环）、input 挂 aria-busy；与 disabled 同时生效且不双写竞争；文档参数表 / api 说明 / 手把手与 llms-full.txt 同步；npm run check 全绿",
       "notes": "自补：组件能力补齐；loading 接管时 disabled 不再走 h() 绑定，单一 effect 写入避免竞争",
-      "status": "open"
+      "status": "done"
     }
   ]
 }

.ua/iterations.log

@@ -169,3 +169,4 @@
 {"ts":"2026-10-26T14:34:12+08:00","id":"g122","result":"done","commit":"72c5d24","summary":"rate 支持 allowHalf 半星（左半区 0.5 分、键盘 0.5 步进、渐变裁字半格填充）"}
 {"ts":"2026-10-26T14:35:01+08:00","id":"g123","result":"done","commit":"ba102e0","summary":"收尾刷新 CHANGELOG（319 提交）"}
 {"ts":"2026-10-26T14:37:11+08:00","id":"g124","result":"done","commit":"63d3c91","summary":"checkbox 补 indeterminate 半选态（原生属性同步，零新增 CSS）"}
+{"ts":"2026-10-26T14:44:38+08:00","id":"g125","result":"done","commit":"490c9fa","summary":"开关补 loading 加载态（转圈滑块 + aria-busy，单一 effect 防双写）"}