test(frontend): playwright e2e scaffolding (config + scripts)

frontend/package.json

@@ -6,6 +6,8 @@
   "scripts": {
     "test": "vitest run",
     "dev": "vite",
+    "e2e": "playwright test",
+    "e2e:ui": "playwright test --ui",
     "build": "tsc --noEmit && vite build",
     "preview": "vite preview",
     "check": "tsc --noEmit && eslint . && prettier --check . && vitest run && vite build",
@@ -36,7 +38,9 @@
     "tw-animate-css": "^1.4.0"
   },
   "devDependencies": {
+    "@axe-core/playwright": "^4.13.0",
     "@eslint/js": "^10.0.1",
+    "@playwright/test": "^1.63.0",
     "@tailwindcss/vite": "^4.3.3",
     "@testing-library/dom": "^10.4.2",
     "@testing-library/jest-dom": "^7.0.1",