iter(g224): 收起态上下键微调时间

packages/skin/ui/src/timePicker.ts

@@ -127,10 +127,17 @@ export function timePicker(props: TimePickerProps): HTMLElement {
 
   effect(() => { clearBtn.hidden = !clearable || !value(); }); // 无值或未开启时藏起来（hidden 一并移出点击区）
   root.addEventListener('keydown', (e: KeyboardEvent) => {
-    if (open() || !clearable) return; // 卫语句：展开时按键归列内导航，未开启清空则不接管
-    if (e.key !== 'Backspace' && e.key !== 'Delete') return; // 卫语句：只接管这两个键
+    if (open()) return; // 卫语句：展开时按键归列内导航
+    if (clearable && (e.key === 'Backspace' || e.key === 'Delete')) { // 收起态清空：不必伸手去点 ×
+      e.preventDefault();
+      clear();
+      return;
+    }
+    if (!value() || (e.key !== 'ArrowUp' && e.key !== 'ArrowDown')) return; // 卫语句：无值不猜、只管上下键
     e.preventDefault();
-    clear(); // 键盘等价：不必伸手去点 ×
+    const delta = (e.key === 'ArrowUp' ? 1 : -1) * (e.shiftKey ? 60 : step); // Shift + ↑↓ 按小时调，否则按步长调
+    const total = (Number(picked().hh) * 60 + Number(picked().mm) + delta + 1440) % 1440; // 环形：00:00 的上一档回到 23:xx
+    commit(pad(Math.floor(total / 60)), pad(total % 60)); // 收起态改值同样派发 onChange
   });
   bindOutside(root, open, () => open(false)); // 点外部收起：仅展开期间挂监听
   effect(() => {