style(credentials): refine education and certificate cards

src/components/MilestonesSection.tsx

@@ -50,13 +50,14 @@ export const MilestonesSection: React.FC = () => {
                 {/* View Certificate Link */}
                 <div className={styles.actionRow}>
                   <a
-                    href={item.link || '#'}
+                    href={item.link && item.link !== '#' ? item.link : item.image}
                     className={styles.viewCertLink}
                     target="_blank"
                     rel="noopener noreferrer"
+                    aria-label={`View ${item.title} certificate`}
                   >
                     <span>View certificate</span>
-                    <ExternalLink size={20} strokeWidth={2.25} />
+                    <ExternalLink size={20} strokeWidth={2.25} aria-hidden="true" />
                   </a>
                 </div>
               </div>