fix: use available icon for LinkedIn sharing

src/components/CaseStudyShare.tsx

@@ -1,9 +1,9 @@
 'use client';
 
 import {
+  BriefcaseBusiness,
   Check,
   Copy,
-  Linkedin,
   Mail,
   MessageCircle,
   Send,
@@ -152,7 +152,7 @@ export function CaseStudyShare({ locale }: { locale: Locale }) {
               <MessageCircle aria-hidden="true" /><span>{copy.shareWhatsApp}</span>
             </a>
             <a href={`https://www.linkedin.com/sharing/share-offsite/?url=${encodedUrl}`} target="_blank" rel="noopener noreferrer">
-              <Linkedin aria-hidden="true" /><span>{copy.shareLinkedIn}</span>
+              <BriefcaseBusiness aria-hidden="true" /><span>{copy.shareLinkedIn}</span>
             </a>
             <a href={`mailto:?subject=${encodedTitle}&body=${encodedMessage}`}>
               <Mail aria-hidden="true" /><span>{copy.shareEmail}</span>