feat(ark): add user component

packages/ark/src/components/user/avatar.tsx

@@ -0,0 +1,48 @@
+import { cn } from "@lume/utils";
+import * as Avatar from "@radix-ui/react-avatar";
+import { minidenticon } from "minidenticons";
+import { useMemo } from "react";
+import { useUserContext } from "./provider";
+
+export function UserAvatar({ className }: { className?: string }) {
+	const user = useUserContext();
+	const fallbackAvatar = useMemo(
+		() =>
+			`data:image/svg+xml;utf8,${encodeURIComponent(
+				minidenticon(user?.pubkey, 90, 50),
+			)}`,
+		[user],
+	);
+
+	if (!user) {
+		return (
+			<div className="shrink-0">
+				<div
+					className={cn(
+						"bg-black/20 dark:bg-white/20 animate-pulse",
+						className,
+					)}
+				/>
+			</div>
+		);
+	}
+
+	return (
+		<Avatar.Root className="shrink-0">
+			<Avatar.Image
+				src={user.image}
+				alt={user.pubkey}
+				loading="eager"
+				decoding="async"
+				className={className}
+			/>
+			<Avatar.Fallback delayMs={120}>
+				<img
+					src={fallbackAvatar}
+					alt={user.pubkey}
+					className={cn("bg-black dark:bg-white", className)}
+				/>
+			</Avatar.Fallback>
+		</Avatar.Root>
+	);
+}