chore(backlog): 记录 g310 完成

.ua/backlog.json

@@ -3180,7 +3180,7 @@
     {
       "id": "g310",
       "domain": "tune",
-      "status": "open",
+      "status": "done",
       "title": "multiSelect 补「全选 / 半选」：8 个候选逐个点太慢",
       "motivation": "多选下拉只能逐项点或按退格删标签，选项一多就是体力活；transfer 早就有三态全选框，multiSelect 这个更常用的组件反而没有，用户只能「先搜再一个个点」。",
       "acceptance": "① 新增 selectAll 入参：弹层顶部一行「全选（已选/可选）」，全选 ✓、部分选中显 –、再点即清空这批；② 只作用于当前过滤结果，先搜再全选＝按条件批量选；③ 到 max 时补满即停，不静默超选；④ 键盘可达：全选行占 active -1 号位，↑↓ 能走到、Enter 触发；⑤ manifest 参数表与手把手、demo 同步，npm run check 全绿。",

.ua/iterations.log

@@ -354,3 +354,4 @@
 {"ts":"2026-10-27T00:36:37+08:00","id":"g307","result":"done","commit":"6dfc2f8","summary":"新增 --ua-z-raised 且拖拽行用上，投影不再被后续行遮住"}
 {"ts":"2026-10-27T00:37:46+08:00","id":"g308","result":"done","commit":"f1916ef","summary":"sortableList 贴边自动滚：拖到容器上下沿按帧滚动，松手即停"}
 {"ts":"2026-10-27T00:39:08+08:00","id":"g309","result":"done","commit":"ae105b6","summary":"新增 ua iter done/add：留痕与补条目由 CLI 保证字段、时区与状态，删掉两个临时脚本"}
+{"ts":"2026-10-27T00:40:53+08:00","id":"g310","result":"done","commit":"be169b3","summary":"multiSelect 新增 selectAll：三态全选行 + 只作用于过滤结果 + 到 max 补满即停 + 键盘可达"}