Set discovery card descriptions to 3 lines

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

frontend/src/pages/Discovery.jsx

@@ -150,7 +150,7 @@ function ChannelCard({ item }) {
         )}
 
         {!featured && item.description && (
-          <p className="text-xs text-zinc-500 line-clamp-1">{item.description}</p>
+          <p className="text-xs text-zinc-500 line-clamp-3">{item.description}</p>
         )}
 
         <div className="mt-auto pt-1">