fix: add playwright as dep

Author: AugustinMauroy

apps/site/package.json

@@ -55,6 +55,7 @@
     "next": "15.3.1",
     "next-intl": "~4.1.0",
     "next-themes": "~0.4.6",
+    "playwright": "^1.52.0",
     "postcss": "~8.5.3",
     "postcss-calc": "~10.1.1",
     "postcss-loader": "~8.1.1",