chore: add prettier

Author: shellscape

package.json

@@ -79,6 +79,7 @@
     "postcss": "^8.5.6",
     "postcss-value-parser": "^4.2.0",
     "pre-commit": "^1.2.2",
+    "prettier": "^3.6.2",
     "prettier-plugin-package": "^1.4.0",
     "rewiremock": "^3.14.6",
     "strip-ansi": "^7.1.0",