Fix: broken clean script

Author: rg-wood

package-lock.json

@@ -57,6 +57,7 @@
     "papaparse": "^5.5.3",
     "plop": "^4.0.5",
     "prettier": "3.8.1",
+    "rimraf": "^6.1.3",
     "stylelint": "^17.3.0",
     "stylelint-config-standard": "^40.0.0",
     "undici-types": "^7.16.0"