feat: mentions

src/element/avatar.tsx

@@ -0,0 +1,17 @@
+import { MetadataCache } from "@snort/system";
+
+export function Avatar({
+  user,
+  avatarClassname,
+}: {
+  user: MetadataCache;
+  avatarClassname: string;
+}) {
+  return (
+    <img
+      className={avatarClassname}
+      alt={user?.name || user?.pubkey}
+      src={user?.picture ?? ""}
+    />
+  );
+}