Add mauve, olive, mist, and taupe color palettes (#19627)

## Summary

This PR adds four new neutral color palettes to Tailwind CSS: `mauve`,
`olive`, `mist`, and `taupe`. Each palette includes 11 shades (50, 100,
200, 300, 400, 500, 600, 700, 800, 900, 950) defined using the OKLch
color space for perceptually uniform color transitions.

These new palettes expand the available neutral color options beyond the
existing stone, slate, gray, zinc, and neutral palettes, providing
designers with more nuanced choices for different design systems and
brand aesthetics.

The changes include:
- Added color definitions to `packages/tailwindcss/src/compat/colors.ts`
- Added corresponding CSS custom properties to
`packages/tailwindcss/theme.css`

## Test plan

To verify these changes:
1. Build the project and ensure no compilation errors occur
2. Verify that the new color palettes are available in the Tailwind
config
3. Test that utilities like `bg-mauve-500`, `text-olive-600`,
`border-mist-300`, and `ring-taupe-400` work correctly
4. Confirm that the colors render with proper OKLch values in the
browser

https://claude.ai/code/session_01QhC1ZYkW3pCd55WbbqYBNV

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Co-authored-by: Claude <noreply@anthropic.com>
Co-authored-by: coderabbitai[bot] <136622811+coderabbitai[bot]@users.noreply.github.com>
Co-authored-by: Robin Malfait <malfait.robin@gmail.com>