Fix npm build for TypeScript 6.0

  - tsconfig: bump module/target/lib to ES2020 + DOM (fetch, URL, Object.values)
  - tsconfig: drop deprecated baseUrl/paths, switch moduleResolution to bundler
  - tsconfig: add ignoreDeprecations "6.0" (tsup forces baseUrl into dts plugin)
  - tsconfig: explicit types ["node", "jest"] (auto-load fails under bundler)
  - package.json: add @types/node to devDependencies (was only transitive)
  - package-lock.json: refresh via make update

Author: Denis-Averin