Feature: panda-preset-color-radix: add contrast color option and scale values

[amandaguthrie]

🆕 Adds

> panda-preset-color-radix

Adds Three Color Scale Values

We've added three scale values to the standard Radix colors for ease of theming.

• 0: Intended for white in light mode and black for dark mode.
• 9c: The contrast color for color scale 9. A few Radix colors require dark text to meet contrast requirements. This
  makes it easier by building those contrast values into the core and semantic color scales in a consistent fashion.
  Defaults to white for all colors except for amber, yellow, mint, lime, and sky.
• 13: Intended for black in light mode and white for dark mode.

The default black and white colors can be replaced in the preset options using the contrastColorOverrides object.

✅ Quality Checklist

> 🟢 All Pull Requests

• Tests updated?
• Test snapshot generation is turned off?
• Documentation updated?
• Changesets added/updated?
• Checks passing (biome, prettier, Typescript, unit tests)?

> ⬆️ Version Change(s)

• Major: Breaking changes
• Minor: Backward-compatible feature additions
• Patch: Backward-compatible bug fixes

• Changesets version request matches semver definitions?
• If major version, decisioning logic around choosing backward-incompatible changes over backward-compatible changes
  is included in changeset?