test: playwright smoke (chromium + firefox) for real scroll and dots fallback

playwright.config.ts

@@ -0,0 +1,21 @@
+import { defineConfig, devices } from '@playwright/test';
+
+const isCI = !!process.env.CI;
+
+export default defineConfig({
+  testDir: 'e2e',
+  testMatch: /.*\.test\.ts$/,
+  forbidOnly: isCI,
+  retries: isCI ? 2 : 0,
+  reporter: isCI ? [['html', { open: 'never' }], ['github']] : [['list']],
+  use: { baseURL: 'http://localhost:5173' },
+  projects: [
+    { name: 'chromium', use: { ...devices['Desktop Chrome'] } },
+    { name: 'firefox', use: { ...devices['Desktop Firefox'] } },
+  ],
+  webServer: {
+    command: 'yarn dlx http-server . -p 5173 -s',
+    port: 5173,
+    reuseExistingServer: !isCI,
+  },
+});