Add id attributes for better element identification

Updated ResponseMessage.svelte

Update Sidebar.svelte

src/lib/components/channel/Navbar.svelte

@@ -19,6 +19,7 @@
 
 <nav class="sticky top-0 z-30 w-full px-1.5 py-1.5 -mb-8 flex items-center drag-region">
 	<div
+		id="navbar-bg-gradient-to-b"
 		class=" bg-linear-to-b via-50% 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>