🎨 Automated color contrast for text over images

Sass implementation of the Accessible Perceptual Contrast Algorithm (APCA) for the WCAG 3.0 specification.

The corrected introduction to APCA, a rebuttal and discussion of xi's repo from which this is forked.

Core utilities library for UI Color Palette - a color management plugin for design tools. This library provides the foundational color manipulation, contrast calculation, and palette generation features used in the plugin.