Added missing library, again using AI.

Author: davidwesst

package.json

@@ -40,7 +40,8 @@
     "http-server": "^14.1.1",
     "rimraf": "^6.0.1",
     "simple-git": "^3.27.0",
-    "yaml": "^2.6.1"
+    "yaml": "^2.6.1",
+    "playwright": "^1.18.0"
   },
   "type": "module"
 }