MainView component.
This component is responsible for rendering the main view for a teacher.
It uses the UserContext to get the current user and displays a loading spinner until the user data is available.
It also fetches the courses taught by the teacher and displays them in cards.
MainView component. This component is responsible for rendering the main view for a teacher. It uses the UserContext to get the current user and displays a loading spinner until the user data is available. It also fetches the courses taught by the teacher and displays them in cards.