iter(g166): 下拉选项支持分组标题

packages/skin/ui/src/select.ts

@@ -60,6 +60,19 @@ export function select(props: SelectProps): HTMLElement {
       opt.label,
     ),
   );
+  // —— 分组：相邻同组选项合成一段，组内首项前插小标题；记下区间供过滤时整组显隐 ——
+  const nodes: HTMLElement[] = []; // 弹层内容序列（小标题与选项混排）
+  const runs: { el: HTMLElement; from: number; to: number }[] = []; // 每段标题及其首尾选项下标
+  props.options.forEach((opt, i) => {
+    let run = runs[runs.length - 1] ?? null;
+    if (opt.group && (!run || run.to !== i - 1)) { // 新起一段：标题插在本组首项之前
+      const el = h('div', { class: 'ua-option-group', role: 'presentation' }, opt.group);
+      run = { el, from: i, to: i };
+      runs.push(run);
+      nodes.push(el);
+    } else if (opt.group && run) run.to = i; // 同组续接：只拉长区间
+    nodes.push(options[i]);
+  });
   const search = h('input', {
     type: 'search',
     class: 'ua-select-search',
@@ -75,7 +88,7 @@ export function select(props: SelectProps): HTMLElement {
     'div',
     { class: () => `ua-select-pop${open() ? ' ua-open' : ''}${place() === 'top' ? ' is-flip' : ''}`, role: 'listbox' },
     props.searchable ? search : null,
-    ...options,
+    ...nodes,
     blank,
   );
 
@@ -129,6 +142,11 @@ export function select(props: SelectProps): HTMLElement {
       el.hidden = !on; // 不匹配即折叠，键盘只在可见项之间移动
       if (on) shown += 1;
     });
+    for (const run of runs) { // 整组都无命中时连小标题一起藏，不留孤零零的分组名
+      let any = false;
+      for (let i = run.from; i <= run.to; i++) if (match(i)) { any = true; break; }
+      run.el.hidden = !any;
+    }
     blank.hidden = shown > 0 || !q; // 仅「有关键字且无命中」时才提示
   });
   effect(() => {