Two dashboard bugs reported after clock-in:
1. 'Dochazka dnes' / 'Pritomni dnes' showed everyone absent even after
refresh: attendance.shift_date is @db.Date and Prisma truncates filter
Dates to their UTC date part, so the local-midnight boundaries
(new Date(y,m,d) = 22:00/23:00Z of the previous day) queried
[yesterday, today) and matched zero of today's punches. Boundaries are
now UTC-midnight instants of the local (Prague) calendar day.
Reproduced empirically against real rows; route-level regression test
added (dashboard.test.ts).
2. After logout + login as a different user, cached dashboards/buttons from
the previous user were served: query keys are user-agnostic and the
React Query cache outlives the session. logout(), login() and the 2FA
verify path now clear the whole cache.
Co-Authored-By: Claude Fable 5 <noreply@anthropic.com>
