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, 1 insertions, 3 deletions

diff --git a/scripts/theme-studio/app-core.js b/scripts/theme-studio/app-core.js
index 1f2ee9d91..9780a7820 100644
--- a/scripts/theme-studio/app-core.js
+++ b/scripts/theme-studio/app-core.js
@@ -9,7 +9,7 @@
 // where normHex (app-util.js) and the colormath helpers are already present from
 // the bodies inlined above this one.
 import { normHex } from './app-util.js';
-import { oklch2hex, srgb2oklab, oklab2oklch, oklab2lrgb, lrgb2hex, inGamut, contrast } from './colormath.js';
+import { oklch2hex, srgb2oklab, oklab2lrgb, lrgb2hex, inGamut, contrast, oklchOf, isPureEndpointHex } from './colormath.js';
 
 // Resolve a palette name (or a raw #hex) to a hex; null when the name is unknown.
 function nameToHex(n,palette){if(!n)return null;if(/^#/.test(n))return n;const p=palette.find(p=>p[1]===n);return p?p[0]:null;}
@@ -204,9 +204,7 @@ function lMax(hue,chroma,fgSet,target){
 // the editable truth; these pure functions group it, regenerate a ramp, and plan
 // assignment re-point across a regenerate.
 
-function oklchOf(hex){return oklab2oklch(srgb2oklab(hex));}
 function isReservedGroundLikeName(name){return /^(bg|fg)(?:[-_+].+|\d.*)$/i.test(name||'');}
-function isPureEndpointHex(hex){const h=(hex||'').toLowerCase();return h==='#ffffff'||h==='#000000';}
 function interpOklabHex(a,b,t,offset){
   const lab={L:a.L+(b.L-a.L)*t,a:a.a+(b.a-a.a)*t,b:a.b+(b.b-a.b)*t};
   const lrgb=oklab2lrgb(lab.L,lab.a,lab.b);