enh: hide pinned chats when searching

src/lib/components/layout/Sidebar.svelte

@@ -461,7 +461,7 @@
 				</div>
 			{/if}
 
-			{#if $pinnedChats.length > 0}
+			{#if !search && $pinnedChats.length > 0}
 				<div class="pl-2 py-2 flex flex-col space-y-1">
 					<div class="">
 						<div class="w-full pl-2.5 text-xs text-gray-500 dark:text-gray-500 font-medium pb-1.5">