refactor(theme-studio): share oklchOf and isPureEndpointHex from colormath

oklchOf and isPureEndpointHex were each defined identically in app-core.js and palette-generator-core.js, and hueOfHex inlined oklchOf's body a third time. I moved both helpers into colormath.js, which already owns the primitives they call, and had the two consumers import them. hueOfHex now calls oklchOf instead of re-deriving it.

1 files changed, 6 insertions, 1 deletions

diff --git a/scripts/theme-studio/colormath.js b/scripts/theme-studio/colormath.js
index 2a7328e54..b57da9131 100644
--- a/scripts/theme-studio/colormath.js
+++ b/scripts/theme-studio/colormath.js
@@ -217,4 +217,9 @@ function reliefColors(bgHex) {
   return { hl: one(1.2, 0x8000), sh: one(0.6, 0x4000) };
 }
 
-export { srgb2oklab, oklab2oklch, oklch2oklab, oklch2hex, apca, deltaE, hex2rgb, lin, rl, contrast, rating, hsv2rgb, rgb2hsv, rgb2hex, oklab2lrgb, inGamut, lrgb2hex, planeCell, paletteWarnings, reliefColors };
+// OKLCH of a hex, and the pure black/white endpoint test. Shared by app-core
+// and palette-generator-core (both previously kept their own identical copies).
+function oklchOf(hex){return oklab2oklch(srgb2oklab(hex));}
+function isPureEndpointHex(hex){const h=(hex||'').toLowerCase();return h==='#ffffff'||h==='#000000';}
+
+export { srgb2oklab, oklab2oklch, oklch2oklab, oklch2hex, apca, deltaE, hex2rgb, lin, rl, contrast, rating, hsv2rgb, rgb2hsv, rgb2hex, oklab2lrgb, inGamut, lrgb2hex, planeCell, paletteWarnings, reliefColors, oklchOf, isPureEndpointHex };