Pin @types/node to ^18.19.0 to match supported runtime

  The previous ^25.6.0 allowed TypeScript to accept Node ≥19 APIs that
  would crash at runtime on Node 18 (the minimum per engines field).
  Pinning to the lowest supported Node major lets the type checker catch
  accidental use of post-18 APIs.

Author: Denis-Averin

package-lock.json

@@ -175,7 +175,7 @@
   },
   "devDependencies": {
     "@types/jest": "^30.0.0",
-    "@types/node": "^25.6.0",
+    "@types/node": "^18.19.0",
     "@typescript-eslint/eslint-plugin": "^8.40.0",
     "@typescript-eslint/parser": "^8.40.0",
     "eslint": "^9.33.0",