Rename dome tabs to 'West-Kuppel' style

Co-Authored-By: Claude Sonnet 4.6 <noreply@anthropic.com>

app/MainClient.tsx

@@ -78,7 +78,7 @@ export default function MainClient({ kuerzel, beoId, beoName }: Props) {
               }`}
             >
               <span className="sm:hidden">{k}</span>
-              <span className="hidden sm:inline">Kuppel {k}</span>
+              <span className="hidden sm:inline">{k}-Kuppel</span>
             </button>
           ))}
         </div>