refactor(theme-studio): tier-1 simplification pass

These are behavior-preserving cleanups from the refactor/simplify assessment, all test-verified.

I merged syncMockHeight and syncPkgHeight into one syncPaneHeight(tableId, paneId), inlined the two single-use displayHex/displayName closures, dropped a pkgbody guard that buildPkgTable already does, and had paintUI call worstCellHtml instead of rebuilding the covered-contrast cell. I deleted the dead generatorHues "manual" branch (a copy of the fallback) and locateInfoLine (orphaned when I removed the preview info line earlier today). The two nerd-icons loaders now share _load_nerd_icons_artifact, with a sentinel so a null-file edge keeps its exact behavior. face_coverage.classify reads through named locals now, guarded by a new characterization test.

Two assessment findings were wrong and skipped after I checked them against the code: LOCATE_REG is live (read by previewSpan), and normalizePaletteEntryCore doesn't exist.

1 files changed, 1 insertions, 2 deletions

diff --git a/scripts/theme-studio/palette-generator-core.js b/scripts/theme-studio/palette-generator-core.js
index 6ad2bf44f..033fff373 100644
--- a/scripts/theme-studio/palette-generator-core.js
+++ b/scripts/theme-studio/palette-generator-core.js
@@ -50,8 +50,7 @@ function generatorHues(baseHue,scheme,count,rng){
     const offsets=[0,120,240,30,150,270,60,180,300,90,210,330];
     return offsets.slice(0,n).map(o=>(b+o)%360);
   }
-  if(scheme==='manual')return Array.from({length:n},(_,i)=>(b+(i*360)/n)%360);
-  return Array.from({length:n},(_,i)=>(b+(i*360)/n)%360);
+  return Array.from({length:n},(_,i)=>(b+(i*360)/n)%360); // even spread (manual/default/unknown)
 }
 function generatorChroma(mode){
   return mode==='subdued'?0.055:mode==='vivid'?0.13:0.085;