Tai Groot 3d35bdf700 feat: add OKLCH color space support ...

Add OKLCH struct and conversion methods (sRGB ↔ OKLab ↔ OKLCH) using
Björn Ottosson's matrices. Includes:

- SimpleColor.ToOKLCH() and FromOKLCH() for color conversion
- SimpleColor.ClampOKLCH() for bounding lightness/chroma
- SimplePalette.ClampOKLCH(), NormalizeLightness(), NormalizeChroma()
  for palette-level OKLCH operations
- Comprehensive tests with round-trip, known values, and clamping

2026-02-22 21:32:45 +00:00

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