/api/caldav/events now returns an "errors" array alongside "events" for
calendars that failed to sync (e.g. expired credentials) while still
reporting success overall. Previously such failures were silently
swallowed, so a calendar could appear enabled/visible while showing zero
events with no explanation.
- CalendarRepository.fetchEvents now returns EventsResult(events, errors),
parsing the new "errors" array the same way importIcs's Triple return
handles multi-value results.
- CalendarUiState gains syncErrors, populated in loadRange's onSuccess.
- CalendarScreen shows a second error-style banner for sync errors,
additive to the existing network-failure banner.
- CalendarFilterSheet shows a warning icon next to calendar rows whose
source+name matches a sync error (best-effort suffix match, since the
server's error name is "<account> – <calendar name>").
3137abcef2