Add id attributes for better element identification

Updated ResponseMessage.svelte

Update Sidebar.svelte

src/lib/components/chat/Navbar.svelte

@@ -73,6 +73,7 @@
 <nav class="sticky top-0 z-30 w-full py-1 -mb-8 flex flex-col items-center drag-region">
 	<div class="flex items-center w-full pl-1.5 pr-1">
 		<div
+			id="navbar-bg-gradient-to-b"
 			class=" bg-linear-to-b via-40% to-97% from-white via-white to-transparent dark:from-gray-900 dark:via-gray-900 dark:to-transparent pointer-events-none absolute inset-0 -bottom-7 z-[-1]"
 		></div>