- Auth: introduce a shared AuthProvider/useAuth so entering the PIN updates
reactive state and the layout's gate navigates immediately (previously it
cached the token check at startup, so login appeared to hang until a manual
refresh). login/scanner now use signIn/signOut.
- Banquet: donor lookup now returns lifetime giving, last-12-months giving
(computed from dated transactions), member/donor status, bear name, and tags.
The banquet result screen shows status badge + lifetime and last-year figures.
Tickets are irrelevant in banquet mode.
- Admin: fix "‹ Scanner" back link wrapping (remove fixed width).
Co-Authored-By: Claude Fable 5 <noreply@anthropic.com>
