💄 Fixed BUG that could not be deleted after @model was selected

src/lib/components/chat/MessageInput.svelte

@@ -384,7 +384,7 @@
 
 				{#if atSelectedModel !== undefined}
 					<div
-						class="px-3 py-2.5 text-left w-full flex justify-between items-center absolute bottom-0 left-0 right-0 bg-gradient-to-t from-50% from-white dark:from-gray-900"
+						class="px-3 py-2.5 text-left w-full flex justify-between items-center absolute bottom-0 left-0 right-0 bg-gradient-to-t from-50% from-white dark:from-gray-900 z-50"
 					>
 						<div class="flex items-center gap-2 text-sm dark:text-gray-500">
 							<img