Phase 6 follow-up: today-and-future events, one write per school-wide event

Two corrections found while preparing the first live run:

- A scan that runs late in the day still records today's school events; the
  candidate window now starts at the local start of day instead of "now".
- The Compass week calendar is school-wide, so one event is stored against each
  child. Write it once, with no child prefix in the title, and record the same
  Home Assistant event id on every child's item. A per-child event still keeps
  the child's name.

Also report pending events as events, not rows, in `school calendar status`.
Tests cover the window and the de-duplication.

Co-Authored-By: Paperclip <noreply@paperclip.ing>

internal/web/server.go

@@ -605,7 +605,7 @@ func (s *Server) itemCalendarView(it store.CalendarItem, now time.Time) calendar
 		UID:        it.HAEventUID,
 	}
 	v.Eligible = it.Type == "event" && it.Source == "compass" && it.Importance == "high" &&
-		it.DueAt != nil && it.DueAt.After(now)
+		it.DueAt != nil && !it.DueAt.Before(calendar.StartOfDay(now))
 	if it.HAPushedAt != nil {
 		v.PushedAt = it.HAPushedAt.In(s.cfg.Location).Format("Mon 02 Jan 2006 15:04")
 	}