feat: show desc in model selector

src/lib/components/chat/Messages/Placeholder.svelte

@@ -65,7 +65,7 @@
 
 				<div in:fade={{ duration: 200, delay: 200 }}>
 					{#if models[selectedModelIdx]?.info}
-						<div class="mt-0.5 text-base font-normal text-gray-500 dark:text-gray-400">
+						<div class="mt-0.5 text-base font-normal text-gray-500 dark:text-gray-400 line-clamp-3">
 							{models[selectedModelIdx]?.info?.meta?.description}
 						</div>
 						{#if models[selectedModelIdx]?.info?.meta?.user}