feat: alert support customize footer (#5940)

* Alert组件支持自定义footer

packages/@core/ui-kit/popup-ui/src/alert/alert.ts

@@ -34,6 +34,8 @@ export type AlertProps = {
   contentClass?: string;
   /** 执行beforeClose回调期间，在内容区域显示一个loading遮罩*/
   contentMasking?: boolean;
+  /** 弹窗底部内容（与按钮在同一个容器中） */
+  footer?: Component | string;
   /** 弹窗的图标（在标题的前面） */
   icon?: Component | IconType;
   /**

packages/@core/ui-kit/popup-ui/src/alert/alert.vue

@@ -157,7 +157,11 @@ async function handleOpenChange(val: boolean) {
           </div>
           <VbenLoading v-if="loading && contentMasking" :spinning="loading" />
         </AlertDialogDescription>
-        <div class="flex justify-end gap-x-2" :class="`justify-${buttonAlign}`">
+        <div
+          class="flex items-center justify-end gap-x-2"
+          :class="`justify-${buttonAlign}`"
+        >
+          <VbenRenderContent :content="footer" />
           <AlertDialogCancel v-if="showCancel" as-child>
             <component
               :is="components.DefaultButton || VbenButton"