feat: 브랜드 컬러 토큰 적용 및 색상 규칙 추가

features/home/components/spline-scene.tsx

@@ -16,7 +16,7 @@ export function SplineScene({ sceneUrl, className }: SplineSceneProps) {
     <div className={cn("relative h-full w-full", className)}>
       {isLoading && (
         <div className="absolute inset-0 flex items-center justify-center bg-zinc-100 dark:bg-zinc-900">
-          <div className="h-10 w-10 animate-spin rounded-full border-4 border-zinc-200 border-t-indigo-500 dark:border-zinc-800" />
+          <div className="h-10 w-10 animate-spin rounded-full border-4 border-zinc-200 border-t-brand-500 dark:border-zinc-800" />
         </div>
       )}
       <Spline