Initial testing framework

playwright.config.ts

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+import { defineConfig, devices } from '@playwright/test';
+
+export default defineConfig({
+  testDir: 'tests/e2e',
+  timeout: 60_000,
+  expect: { timeout: 10_000 },
+  fullyParallel: true,
+  retries: process.env.CI ? 2 : 0,
+  reporter: [['list'], ['html', { open: 'never' }]],
+  use: {
+    baseURL: 'http://localhost:3000',
+    trace: 'on-first-retry',
+    screenshot: 'only-on-failure',
+    video: 'retain-on-failure'
+  },
+  webServer: {
+    command: 'npm run preview',
+    url: 'http://localhost:3000',
+    reuseExistingServer: !process.env.CI
+  },
+  projects: [
+    { name: 'chromium', use: { ...devices['Desktop Chrome'] } },
+    { name: 'firefox', use: { ...devices['Desktop Firefox'] } },
+    { name: 'webkit', use: { ...devices['Desktop Safari'] } },
+    { name: 'mobile', use: { ...devices['iPhone 13'] } }
+  ]
+});