The student app's login page offers Microsoft 365 when the provider is
configured, /auth/oauth/callback redeems the one-time code, a consent
screen finishes a first sign-in, the profile attaches Microsoft through
a link ticket, and the service worker leaves /oauth alone. The build
also carries the summer presentation theme already committed in the
frontend sources.
The schedule showed a lecturer only where the session notes named one
(Globalizacja), so the student plan had nobody under the other courses.
The session JSON now carries the course lecturer in its course ref and an
optional per-session lecturer (new nullable column, admin field, seed key)
for courses shared between two people. The student app shows the
session's own lecturer or, failing that, the course's.
