Github User Searcher

In this challenge, you will build a Github User Searcher — a search card that lets users look up any GitHub username and see their profile details instantly.

Your component must have a search field and a search button. When the user searches for a username, it should fetch their data and display their avatar, name, bio, number of repositories, and follower/following stats. If the username doesn't exist, show a friendly error message instead of breaking the layout.