chore: replace deprecated copyfiles with modern cpy-cli

Author: electricessence

package.json

@@ -33,7 +33,7 @@
     "build:cjs": "tsc -p tsconfig.cjs.json",
     "build:esm": "tsc -p tsconfig.esm.json",
     "build:umd": "tsc -p tsconfig.umd.json",
-    "build:types": "tsc -p tsconfig.types.json",
+    "build:types": "cpy \"src/**/*.d.ts\" dist --parents && tsc -p tsconfig.types.json",
     "build": "pnpm i && pnpm run clean && concurrently \"pnpm:build:*\"",
     "bump": "pnpm run precommit && pnpm version patch",
     "docs": "rimraf docs && typedoc --options typedoc.json --readme none",
@@ -60,7 +60,7 @@
     "@types/node": "^24.3.0",
     "chai": "^5.2.1",
     "concurrently": "^9.2.0",
-    "copyfiles": "^2.4.1",
+    "cpy-cli": "^6.0.0",
     "eslint": "^9.33.0",
     "mocha": "^11.7.1",
     "rimraf": "^6.0.1",