adds playwright tests

web/tests/playwright/pages/index_page.ts

@@ -0,0 +1,19 @@
+import { expect, type Locator, type Page } from '@playwright/test';
+
+export class IndexPage {
+  readonly page: Page;
+  readonly error: Locator;
+
+  constructor(page: Page) {
+    this.page = page;
+    this.error = page.getByText("Internal Error");
+  }
+
+  async goto() {
+    await this.page.goto('/');
+  }
+
+  async hasNoError() {
+    await expect(this.error).toHaveCount(0);
+  }
+}