(Vue Renderer) use setup script + remove any changes as baselines to pass UI tests.

code/renderers/vue3/template/cli/ts/Header.stories.ts

@@ -37,6 +37,6 @@ export const LoggedIn: Story = {
 
 export const LoggedOut: Story = {
   args: {
-    user: undefined,
+    user: null,
   },
 };

code/renderers/vue3/template/cli/ts/Header.vue

@@ -25,7 +25,7 @@
 import './header.css';
 import MyButton from './Button.vue';
 
-defineProps<{ user: { name: string } }>();
+defineProps<{ user: { name: string } | null }>();
 
 defineEmits<{
   (event: 'createAccount'): void;

code/renderers/vue3/template/cli/ts/Page.vue

@@ -55,13 +55,13 @@ import MyHeader from './Header.vue';
 
 import { ref } from 'vue';
 
-const user = ref<{ name: string } | undefined>(undefined)
+const user = ref<{ name: string } | null>(null)
 
 const onLogin = () => {
   user.value = { name: 'Jane Doe' };
 };
 const onLogout = () => {
-  user.value = undefined;
+  user.value = null;
 };
 const onCreateAccount = () => {
   user.value = { name: 'Jane Doe' };