Add `oklch` support

[softmarshmallow]

As tailwind v4 uses oklch as default, the modern web will require lots of usecases based on them.

Adding oklch support seems essential.

Thoughts and plans?

[sonofmagic]

I'm also looking for oklch support, also for tailwindcss@4

[tomstolarczuk]

I can add support for OKLCH colors if they accept PRs.

[scttcper]

i would, yes