refactor: Display 'Could not load Github username' when rate limit or…

… max retries are reached

frontend/islands/GithubUserLink.tsx

@@ -6,17 +6,26 @@ import { cachedGitHubLogin } from "../utils/github.ts";
 
 export function GitHubUserLink({ user }: { user?: User }) {
   const login = useSignal("");
+  const error = useSignal(false);
 
   useEffect(() => {
     if (user) {
       cachedGitHubLogin(user)
         .then((login_) => {
           login.value = login_;
         })
-        .catch(console.error);
+        .catch(error_ =>{
+          console.error(error_);
+
+          error.value = true;
+        });
     }
   });
 
+  if(error.value){
+    return <span>Could not load GitHub username</span>;
+  }
+
   return login.value == ""
     ? <span>loading...</span>
     : <a class="link" href={"https://github.com/" + login.value}>GitHub</a>;