Theme color direct access

[JonasBa]

The ColorOrAlias type is problematic since it creates a coupling between how the theme is structured and which colors are available. Along the same lines, organizing our theme with a flat key list isn't a scalable long term approach.

Developers should use variants to encapsulate different color meanings or access colors directly on the theme.

[cursor]

Cursor Agent can help with this pull request. Just @cursor in comments and I'll start working on changes in this branch.
_{Learn more about Cursor Agents}

[TkDodo]

@JonasBa there’s only a handful of usages that use tooltipUnderline with a specific color, and it’s only:

• linkUnderline
• gray200
• background
• success
• successText, warningText, errorText
• green300, red300, gray300

I think we should be able to find token replacements for those and just use our color tokens here?

[JonasBa]

iirc there was another component that was using this, so I wanted to keep the changes small, but let me see if we can indeed one shot this

[getsantry]

This pull request has gone three weeks without activity. In another week, I will close it.

But! If you comment or otherwise update it, I will reset the clock, and if you add the label WIP, I will leave it alone unless WIP is removed ... forever!

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"A weed is but an unloved flower." ― Ella Wheeler Wilcox 🥀