fix: hideChildrenInMenu demo code (#5626)

playground/src/views/demos/features/hide-menu-children/children.vue

@@ -1,3 +1,23 @@
+<script lang="ts" setup>
+import { Fallback, VbenButton } from '@vben/common-ui';
+import { useTabs } from '@vben/hooks';
+import { X } from '@vben/icons';
+
+const { closeCurrentTab } = useTabs();
+</script>
+
 <template>
-  <div>children</div>
+  <Fallback
+    description="当前路由在菜单中不可见"
+    status="coming-soon"
+    title="被隐藏的子菜单"
+    show-back
+  >
+    <template #action>
+      <VbenButton size="lg" @click="closeCurrentTab()">
+        <X class="mr-2 size-4" />
+        关闭当前标签页
+      </VbenButton>
+    </template>
+  </Fallback>
 </template>