Backend: Include overdue todos and snoozed reminders in /upcoming response,
add end_datetime/snoozed_until/is_overdue fields, widen snooze schema to
accept 1-1440 minutes for 1h/3h/tomorrow options.
Frontend: Full UpcomingWidget rewrite with sticky day separators (Today
highlighted in accent), collapsible groups, past-event toggle, focus mode
(Today + Tomorrow), color-coded left borders, compact type pills, relative
time for today's items, item count badge, and inline quick actions (complete
todo, snooze/dismiss reminder on hover). Card fills available height with
no dead space. DashboardPage always renders widget (no duplicate empty state).
Co-Authored-By: Claude Opus 4.6 <noreply@anthropic.com>