Add `color-scheme` to `highlight` result

[pomber]

Currently

const {style} = await highlight(codeblock, theme)

only includes color and background.

It should also include color-scheme: light or color-scheme: dark depending on the theme.

[pomber]

Should add it to https://github.com/code-hike/lighter first

[github-actions]

This issue has been fixed but not yet released.

Try it in your project before the release with:

npm i https://pkg.pr.new/codehike@474

Or wait for the next release.

[github-actions]

🚀 Released in codehike@1.0.4 🚀

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