style: apply accessibility badge contrast refinements and update primary color to #4E77FF

refer_landing_page/app/publications/[category]/page.tsx

@@ -121,7 +121,7 @@ export default function PublicationCategoryPage({ params }: PageProps) {
                       출원번호: {rec.appNo} ({rec.country}, {rec.appDate})
                     </p>
                     {rec.regNo && (
-                      <p className="text-cobalt font-bold">
+                      <p className="text-cobalt-dark dark:text-cobalt font-bold">
                         등록번호: {rec.regNo} ({rec.regDate})
                       </p>
                     )}
@@ -132,7 +132,7 @@ export default function PublicationCategoryPage({ params }: PageProps) {
                     <div className="flex items-center gap-3">
                       <span>{rec.volume}</span>
                       {rec.kci && (
-                        <span className="bg-cobalt text-ivory text-[0.65rem] px-1.5 py-0.5 rounded font-bold">
+                        <span className="bg-cobalt-dark text-ivory text-[0.65rem] px-1.5 py-0.5 rounded font-bold">
                           KCI 등재
                         </span>
                       )}