test(web-next): add Playwright config + smoke specs (home, about, blog 404)

apps/web-next/package.json

@@ -7,6 +7,8 @@
     "build": "echo 'Next.js build requires full environment — use pnpm dev or docker'",
     "dev": "next dev --port 3000",
     "lint": "eslint .",
+    "test:e2e": "playwright test",
+    "test:e2e:install": "playwright install --with-deps chromium",
     "typecheck": "tsc --noEmit"
   },
   "dependencies": {
@@ -29,6 +31,7 @@
     "superjson": "^2.2.1"
   },
   "devDependencies": {
+    "@playwright/test": "^1.50.0",
     "@repo/eslint-config": "workspace:*",
     "@repo/typescript-config": "workspace:*",
     "@types/node": "^22.0.0",