feat(ui): add ViewCounter component and enhance accessibility annotations

Introduce a new `ViewCounter` component to manage view tracking for content. Add biome-ignore comments for accessibility standards in several UI components, enhance semantic element usage, and improve tag handling in `SearchSidebar`.

frontend/src/components/ui/item.tsx

@@ -6,6 +6,7 @@ import { cn } from "@/lib/utils";
 
 function ItemGroup({ className, ...props }: React.ComponentProps<"div">) {
 	return (
+		// biome-ignore lint/a11y/useSemanticElements: standard pattern for item groups
 		<div
 			role="list"
 			data-slot="item-group"