* feat: redirect authenticated users from signup page - Add session check in signup getServerSideProps - Redirect to redirect parameter if present, otherwise to root - Follows existing authentication patterns in codebase Co-Authored-By: peer@cal.com <peer@cal.com> * fix test * fix test --------- Co-authored-by: Devin AI <158243242+devin-ai-integration[bot]@users.noreply.github.com> Co-authored-by: unknown <adhabal2002@gmail.com> Co-authored-by: Anik Dhabal Babu <81948346+anikdhabal@users.noreply.github.com>