feat: render nostr mentions in chat

src/element/external-link.tsx

@@ -1,7 +1,22 @@
+import { Icon } from "element/icon";
+
+export function ExternalIconLink({ size = 32, href, ...rest }) {
+  return (
+    <span style={{ cursor: "pointer" }}>
+      <Icon
+        name="link"
+        size={size}
+        onClick={() => window.open(href, "_blank")}
+        {...rest}
+      />
+    </span>
+  );
+}
+
 export function ExternalLink({ children, href }) {
   return (
     <a href={href} rel="noopener noreferrer" target="_blank">
       {children}
     </a>
-  )
+  );
 }