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

fix AF-1289

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

tests/affine-mobile/playwright.config.ts

@@ -0,0 +1,74 @@
+import { testResultDir } from '@affine-test/kit/playwright';
+import { devices, type PlaywrightTestConfig } from '@playwright/test';
+
+/**
+ * See https://playwright.dev/docs/test-configuration.
+ */
+const config: PlaywrightTestConfig = {
+  testDir: './e2e',
+  fullyParallel: true,
+  timeout: process.env.CI ? 60_000 : 30_000,
+  outputDir: testResultDir,
+  projects: [
+    {
+      name: 'Mobile Safari',
+      use: {
+        ...devices['iPhone 14'],
+      },
+    },
+    {
+      name: 'Mobile Chrome',
+      use: {
+        ...devices['Pixel 5'],
+      },
+    },
+  ],
+  use: {
+    baseURL: 'http://localhost:8080/',
+    actionTimeout: 10 * 1000,
+    locale: 'en-US',
+    // Collect trace when retrying the failed test. See https://playwright.dev/docs/trace-viewer
+    // You can open traces locally(`npx playwright show-trace trace.zip`)
+    // or in your browser on [Playwright Trace Viewer](https://trace.playwright.dev/).
+    trace: 'on-first-retry',
+    // Record video only when retrying a test for the first time.
+    video: 'on-first-retry',
+  },
+  forbidOnly: !!process.env.CI,
+  workers: 4,
+  retries: 1,
+  // 'github' for GitHub Actions CI to generate annotations, plus a concise 'dot'
+  // default 'list' when running locally
+  // See https://playwright.dev/docs/test-reporters#github-actions-annotations
+  reporter: process.env.CI ? 'github' : 'list',
+
+  webServer: [
+    {
+      command: 'yarn run serve:test-static',
+      port: 8081,
+      timeout: 120 * 1000,
+      reuseExistingServer: !process.env.CI,
+      env: {
+        COVERAGE: process.env.COVERAGE || 'false',
+        ENABLE_DEBUG_PAGE: '1',
+      },
+    },
+    // Intentionally not building the web, reminds you to run it by yourself.
+    {
+      command: 'yarn workspace @affine/mobile static-server',
+      port: 8080,
+      timeout: 120 * 1000,
+      reuseExistingServer: !process.env.CI,
+      env: {
+        COVERAGE: process.env.COVERAGE || 'false',
+      },
+    },
+  ],
+};
+
+if (process.env.CI) {
+  config.retries = 3;
+  config.workers = '50%';
+}
+
+export default config;