fix: Hidden delete button for playground chat messages

src/lib/components/playground/Chat/Message.svelte

@@ -52,7 +52,7 @@
 
 	<div class=" pt-1">
 		<button
-			class=" group-hover:text-gray-500 dark:text-gray-900 dark:hover:text-gray-300 transition"
+			class=" group-hover:text-gray-500 dark:text-gray-500 dark:hover:text-gray-300 transition"
 			on:click={() => {
 				onDelete();
 			}}