The fourth top-level view, alongside Month/Week/Day. A forward-looking
LazyColumn of upcoming events grouped under sticky day headers, reusing
the v2.3 grouped-list language (GroupedRow cards, color-rail leading).
- AgendaViewModel loads a 60-day forward window from the anchor day
(today by default; goToToday/goToDate drive the FAB + drawer jump),
groups instances by local day (ongoing/multi-day clamped to the
anchor), sorts all-day-first then by start.
- AgendaScreen: same drawer + scaffold + view-switcher + FAB shell as
Day; sticky "Today · …"/"Tomorrow · …" headers, event rows with
time·location, plus empty/failure/loading states.
- Wired into CalendarView (ViewAgenda icon), IMPLEMENTED_VIEWS, and
CalendarHost; strings added (EN + DE).
Co-Authored-By: Claude Opus 4.8 (1M context) <noreply@anthropic.com>
