Function useAuth

Returns AuthContextModel

The current auth state and actions:

• currentUser - the signed-in AuthUser, or null.
• token - the raw JWT string, or null.
• loading - true while a login/register request is in flight.
• error - the last error message, or null.
• login(username, password) - authenticate and store the session.
• register(username, password) - create an account, then log in.
• logout() - clear the session (server call is best-effort).

const { currentUser, login, logout } = useAuth();
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