iter(g15): toast 悬停暂停自动关闭

packages/skin/ui/src/toast.ts

@@ -24,6 +24,9 @@ function dismiss(item: HTMLElement): void {
 export function showToast(props: ToastProps): HTMLElement {
   // —— 状态集中声明 ——
   const duration = props.duration ?? 3000; // 停留时长毫秒
+  let timer = 0;         // 自动关闭计时器句柄
+  let remain = duration; // 悬停暂停时记下的剩余时长
+  let startedAt = 0;     // 本段计时起点，用于折算剩余
   const item = h(
     'div',
     { class: `ua-toast ua-toast-${props.variant ?? 'info'}${props.closable ? ' is-closable' : ''}`, role: 'status', id: `ua-toast-${++seq}` },
@@ -35,7 +38,12 @@ export function showToast(props: ToastProps): HTMLElement {
 
   stack.appendChild(item);
   requestAnimationFrame(() => item.classList.add('ua-open')); // 下一帧入场，保证过渡生效
-  window.setTimeout(() => dismiss(item), duration);
+  const arm = (ms: number): void => { startedAt = Date.now(); timer = window.setTimeout(() => dismiss(item), ms); }; // 重新武装倒计时
+  if (duration > 0) {
+    arm(duration);
+    item.addEventListener('pointerenter', () => { window.clearTimeout(timer); remain -= Date.now() - startedAt; }); // 悬停暂停：记下剩余时长
+    item.addEventListener('pointerleave', () => arm(remain)); // 移出后按剩余时长继续
+  }
   return item;
 }