fix: let the chat column shrink so the collapsed sidebar rail is not pushed off screen (#28501)

src/lib/components/chat/Chat.svelte

@@ -4223,7 +4223,7 @@
 		: 'h-screen max-h-[100dvh]'} transition-width duration-200 ease-in-out {$showSidebar &&
 	!embedded
 		? '  md:max-w-[calc(100%-var(--sidebar-width))]'
-		: ' '} w-full max-w-full flex flex-col"
+		: ' '} w-full max-w-full min-w-0 flex flex-col"
 	id={chatContainerId}
 >
 	{#if !loading}