chore: add prettier

Author: shellscape

package.json

@@ -27,7 +27,7 @@
     "lint-staged": "lint-staged",
     "lint:docs": "prettier --write README.md",
     "lint:js": "oxlint --format stylish --fix src test",
-    "lint:json": "prettier --write codecov.yml package.json",
+    "lint:json": "prettier --write package.json",
     "perf": "pnpm build && tsx perf/perf.ts",
     "prepare": "husky",
     "prepublishOnly": "pnpm lint && pnpm build",
@@ -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",