nodejs and deno version bumps

[JoshuaVSherman]

Summary

• Bump Node.js engine requirement to 24.18.1 in package.json and .nvmrc.
• Update CircleCI executor image tag to cimg/node:24.18.1-browsers in .circleci/config.yml.
• Bump package.json version to 3.2.3.

Part of WebJamApps/web-jam-tools#364

How to test locally

1. Run full test suite and quality checks:

npm test && npm run test:lint

2. Verify all 32 unit tests and ESLint + Stylelint pass 100% green.
3. Verify .circleci/config.yml docker image tag points to cimg/node:24.18.1-browsers.

Test evidence

Test Files  12 passed (12)
     Tests  32 passed (32)

🤖 Work by agy — Gemini 3.6 Flash (High)