feat!: Update Node.js support to 24

[AfzalivE]

Summary

Updates the repo's default Node.js version to Node 24 and aligns the supported runtime metadata with the currently supported LTS lines.

Changes

• Set .nvmrc to 24.
• Updated engines.node in package.json and package-lock.json to ^22.0.0 || ^24.0.0.
• Updated pull request CI to run on Node 22.x and 24.x.

Validation

Ran locally with Node v24.16.0 / npm 11.13.0:

• npm test
• npm run lint
• npm run build
• git diff --check

All passed. The existing Browserslist and Rollup warnings still appear during checks, but they are non-blocking.

[codex]

[doistbot]

This PR updates chore: Update Node.js support to 24. No issues were flagged in the reviewed diff.

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[AfzalivE]

@scottlovegrove Since this is a breaking change for Node v16 and v18, do you think it's better to do this in #61 instead with v3?

[scottlovegrove]

@AfzalivE I've updated the title to feat!: which, when merged, should trigger a major version update. I mentioned to @gnapse earlier that we should do this for v3, then the changes in his PR would become v4 instead, otherwise we could be blocked on #61.

[scottlovegrove]

My vote here is we just drop node 22 at this point. @gnapse thoughts?