Until now, /events hid the Status dropdown when Type=Termine. The
date-bucket filters (Heute, Diese Woche, Nächste Woche, Später) only
worked on the deadline rail — m wanted them on appointments too, even
without a "completed" dimension.
Frontend (events.ts):
- New populateStatusFilter() rebuilds the Status <select> options based
on currentType: deadlines get the full 8-option set, appointments
narrow to 5 (Alle + 4 buckets). The "completed/pending/overdue"
options drop because they have no appointment analogue.
- applyTypeVisibility() no longer hides the Status filter for
appointments; it calls the populator instead. The populator runs on
type-chip click and on language change so labels translate live.
- When switching type while a now-invalid status is selected (e.g.
Termine + status=completed via URL), the populator falls back to the
per-type default (deadline → pending, appointment → all) and updates
URL params.
- syncURLParams + isFilterPristine + initFilters use a per-type default
so the appointment view treats `all` as pristine and stays out of the
URL until the user picks a bucket.
- loadList always sends `status` to /api/events; backend already
applies bucket-aware appointment filtering via
bucketAppointmentWindow().
events.tsx:
- The static <option> list collapses to a single placeholder; the
populator owns the option set at hydration.
i18n:
- New `events.filter.status.all` ("Alle"/"All") for the appointment-only
case — `deadlines.filter.all` says "Alle (offen & erledigt)" which is
wrong for appointments (they don't have a completed/pending state).
Backend (event_service_test.go):
- Three new live subtests confirming type=appointment + status=today
narrows to today's appointments, status=later narrows to far-future,
and status=completed collapses the appointment rail (defensive vs.
URL-hacking — the dropdown excludes that value for appointments).
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