iter(g71): 数据表表头补 aria-sort 三态播报

packages/skin/ui/src/dataTable.ts

@@ -102,8 +102,8 @@ export function dataTable<T extends { id: RowKey }>(props: DataTableProps<T>): H
       },
     );
 
-  const th = (col: (typeof props.columns)[number]) =>
-    h(
+  const th = (col: (typeof props.columns)[number]) => {
+    const el = h(
       'th',
       {
         class: `${col.sortable ? 'ua-sortable' : ''}${col.align ? ` ua-align-${col.align}` : ''}`.trim(),
@@ -112,6 +112,14 @@ export function dataTable<T extends { id: RowKey }>(props: DataTableProps<T>): H
       col.header ?? col.key,
       col.sortable ? sortMark(col.key) : null,
     );
+    if (col.sortable) {
+      effect(() => {
+        const rule = state().sorting.find((r) => r.key === col.key); // 与视觉箭头同源
+        el.setAttribute('aria-sort', rule ? (rule.dir === 'asc' ? 'ascending' : 'descending') : 'none');
+      });
+    }
+    return el;
+  };
 
   /*** 骨架行：列宽与表头对齐，行数取当前每页条数（上限 6 行防过长） ***/
   const skeletonRows = (): Node[] => {