Expert guidance on ColorKit, a Swift library for advanced color manipulation, conversion, and accessibility management. Use when developers mention: (1) CKColor, CKBlendMode, CKAPCA, (2) color space conversion (OKLAB, Display P3, sRGB), (3) WCAG or APCA contrast checks, (4) hex color initialization, (5) dynamic/adaptive colors for Dark Mode, (6) perceptual gamut mapping.