test(mobile): basic e2e tests (#8031)

fix AF-1289

1. tested on 'webkit'
2. a few baseline test cases

tests/kit/mobile.ts

@@ -0,0 +1,24 @@
+import { expect } from '@playwright/test';
+
+import { test as baseTest } from './playwright';
+
+type CurrentDocCollection = {
+  meta: { id: string; flavour: string };
+};
+
+export const test = baseTest.extend<{
+  workspace: {
+    current: () => Promise<CurrentDocCollection>;
+  };
+}>({
+  page: async ({ page }, use) => {
+    await page.goto('/');
+    await expect(
+      page.locator('.affine-page-viewport[data-mode="edgeless"]')
+    ).toBeVisible({
+      timeout: 30 * 1000,
+    });
+    await page.goto('/');
+    await use(page);
+  },
+});