enh: responsive styling

src/lib/components/chat/Chat.svelte

@@ -1940,7 +1940,7 @@
 					</div>
 				{/if}
 
-				<div class="flex flex-col flex-auto z-10 w-full">
+				<div class="flex flex-col flex-auto z-10 w-full @container">
 					{#if $settings?.landingPageMode === 'chat' || createMessagesList(history, history.currentId).length > 0}
 						<div
 							class=" pb-2.5 flex flex-col justify-between w-full flex-auto overflow-auto h-0 max-w-full z-10 scrollbar-hidden"