fix(events): drop broken 'From Today' appointment filter; default to today

m/paliad#54 (t-paliad-221) — fix 92780cf added a status=upcoming option
for appointments and made it the default, but DeadlineFilterUpcoming
only narrowed deadlines. The appointment query had no matching case, so
the bucket fell through to the unfiltered path and past events leaked
into "Ab heute" / "From today".

- Drop the 'upcoming' option from STATUS_OPTIONS_APPOINTMENT — confusing
  label that never delivered.
- Default appointments to the 'today' bucket (matches the dashboard
  tile; sane lawyer-relevant view).
- Keep 'Alle (auch vergangene)' as the explicit opt-in at the bottom
  of the list.
- Defensive backend fix: map DeadlineFilterUpcoming to start_at >= today
  in bucketAppointmentWindow so any persisted ?status=upcoming bookmarks
  stop leaking past events.

frontend/src/client/events.ts

@@ -125,8 +125,11 @@ const STATUS_OPTIONS_DEADLINE: StatusOption[] = [
   { value: "completed", key: "deadlines.filter.completed" },
 ];
 
+// Appointment status options — m/paliad#54: the legacy 'upcoming' /
+// "Ab heute" option was a UI lie (backend never narrowed past events for
+// appointments) and is removed. 'today' is the sane default — matches the
+// dashboard tile. 'all' stays as the explicit opt-in for past events.
 const STATUS_OPTIONS_APPOINTMENT: StatusOption[] = [
-  { value: "upcoming", key: "events.filter.status.upcoming" },
   { value: "today", key: "deadlines.filter.today" },
   { value: "this_week", key: "deadlines.filter.thisweek" },
   { value: "next_week", key: "deadlines.filter.nextweek" },
@@ -140,7 +143,7 @@ function statusOptionsFor(type: EventTypeChoice): StatusOption[] {
 }
 
 function defaultStatusFor(type: EventTypeChoice): string {
-  return type === "appointment" ? "upcoming" : "pending";
+  return type === "appointment" ? "today" : "pending";
 }
 
 let currentType: EventTypeChoice = "deadline";

internal/services/event_service.go

@@ -279,7 +279,12 @@ func shouldExcludeAppointmentsForStatus(status DeadlineStatusFilter) bool {
 // matches a bucket-style deadline status — used to filter the
 // appointment side when the user clicks a card on the unified events
 // page. Returns (nil, nil) for non-bucket statuses (pending / all /
-// upcoming / "" / overdue / completed — those are handled separately).
+// "" / overdue / completed — those are handled separately).
+//
+// DeadlineFilterUpcoming maps to "start_at >= today" so legacy
+// `?status=upcoming` URLs hide past appointments instead of falling
+// through to the unfiltered query (m/paliad#54 — the UI option that
+// surfaced this status has been removed, but bookmarks may persist).
 func bucketAppointmentWindow(status DeadlineStatusFilter, b deadlineBucketBounds) (*time.Time, *time.Time) {
 	switch status {
 	case DeadlineFilterToday:
@@ -293,6 +298,8 @@ func bucketAppointmentWindow(status DeadlineStatusFilter, b deadlineBucketBounds
 		return &b.nextMonday, &t
 	case DeadlineFilterLater:
 		return &b.weekAfter, nil
+	case DeadlineFilterUpcoming:
+		return &b.today, nil
 	}
 	return nil, nil
 }