chore: tailwind v4 migration

src/lib/components/chat/Chat.svelte

@@ -1896,7 +1896,7 @@
 			/>
 
 			<div
-				class="absolute top-0 left-0 w-full h-full bg-gradient-to-t from-white to-white/85 dark:from-gray-900 dark:to-[#171717]/90 z-0"
+				class="absolute top-0 left-0 w-full h-full bg-linear-to-t from-white to-white/85 dark:from-gray-900 dark:to-[#171717]/90 z-0"
 			/>
 		{/if}