refactor to place UI in the ui folder

ui/e2e/tsconfig.json

@@ -0,0 +1,4 @@
+{
+  "extends": "@tsconfig/node22/tsconfig.json",
+  "include": ["./**/*"]
+}

ui/e2e/vue.spec.ts

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+import { test, expect } from '@playwright/test';
+
+// See here how to get started:
+// https://playwright.dev/docs/intro
+test('visits the app root url', async ({ page }) => {
+  await page.goto('/');
+  await expect(page.locator('div.greetings > h1')).toHaveText('You did it!');
+})