chore(backlog): 记录 g294 完成

.ua/backlog.json

@@ -3036,11 +3036,11 @@
     {
       "id": "g294",
       "domain": "tune",
-      "status": "open",
+      "status": "done",
       "title": "dataTable 列显隐：工具栏「列」面板 + 受控 hiddenColumns",
       "motivation": "表格列多时用户只想看关心的几列，目前只能靠调用方自己改 columns 重渲染；且 dataTable.ts 已顶到 199 行上限，受控桥接与工具栏构件该分出去。",
       "acceptance": "① 开 columnToggle 后工具栏出现「列」按钮，弹层勾选即时增删列（表头/单元格/colspan/骨架行/空状态/导出全部跟随）；② 至少保留一列可见，最后一列的勾选框置灰；③ 传 hiddenColumns 信号可受控并写回；④ 样式只消费 --ua-* 令牌，npm run audit:visual 计数不涨；⑤ 受控页码与选中桥接抽到 tableBridge.ts，dataTable.ts 仍 ≤200 行；⑥ npm run check 全绿。",
-      "notes": ""
+      "notes": "列显隐落地：新 tableColumns.ts（触发器 + 勾选弹层，末列锁死）+ dataTable 派生 shown()/span() 统一供表头/单元格/骨架/空状态/colgroup 使用；受控页码与选中桥接抽到 tableBridge.ts（dataTable.ts 199→186 行）；导出改惰性取列跟随可见列；ui.css 加 .ua-col-list/.ua-col-item（纯令牌，audit:visual 仍 0 处）"
     }
   ]
 }

.ua/iterations.log

@@ -338,3 +338,4 @@
 {"ts":"2026-10-26T23:20:55+08:00","id":"g291","result":"done","commit":"f88e57f","summary":"autoComplete/cascader/colorPicker/datePicker/timePicker/menu/multiSelect 七处弹层统一接 trackShift，收起即摘监听"}
 {"ts":"2026-10-26T23:21:30+08:00","id":"g292","result":"done","commit":"346d514","summary":"toast 满 4 条后最早一条改调 dismiss()（淡出后移除），与手动关闭同一条路径"}
 {"ts":"2026-10-26T23:22:14+08:00","id":"g293","result":"done","commit":"beca3d8","summary":"AGENTS 强制约定补第 7 条：浮层打开算一次 + 展开期 trackShift + 收起摘监听"}
+{"ts": "2026-10-26T23:32:40+08:00", "id": "g294", "result": "done", "commit": "3914d5d", "summary": "dataTable 加「列」面板（勾选显隐、末列锁死）+ 受控 hiddenColumns；桥接抽成 tableBridge，导出跟随可见列"}