Resolve "Add simple course book list"

Closes #256 (closed) Closes #63 (closed)

Screenshots

Frontend todos

• Uhrzeit so wie im Mockup
  • Rechtsbuendig @ZugBahnHof
• Kasten nicht höher als input-feld
• fach und subject strukturierter nebeneinander
• Kursnamen irgendwie hervorheben
• datum gleiche einrückung wie das datum
• datum sollte überschrift sein und prominenter gestaltet
• datum braucht Wochentag
• mittlere spalte linksaligned
• Indikator ob Stundenthema richtig gespeichert wurde (@yuha )
  • when hovering over icon & success: show some fancy success message
  • when hovering over icon & error: show error message
• verify that changes are being tracked using revisions (using a mixin in core creating revisions when mutating) (blocked by AlekSIS-Core!1433 (merged))
• Remove outer card
• Move search, group select, ... into an app bar (see also this)
• Bottom sheet for date select should not be full width of screen (@yuha )
• Statusicon am Anfang der Zeile fehlt (#63 (closed) explains the different stati)

aleksis/apps/alsijil/models.py

@@ -524,7 +524,7 @@ class Documentation(CalendarEvent):
 
         # 1. Find all LessonEvents for all Lessons of this Course in this date range
         #  TODO: verify that substitutions don't break this
-        events = LessonEvent.get_single_events(date_start, date_end, request, {"type": obj_type, "id": obj_id, }, with_reference_obj=True)
+        events = LessonEvent.get_single_events(date_start, date_end, request, {"type": obj_type, "id": obj_id, }, with_reference_object=True)
         # (1.5 filter them by permissions)
         ...
 
@@ -533,7 +533,7 @@ class Documentation(CalendarEvent):
         return [
             (
                 existing_documentations.first()
-                if (existing_documentations := (event_reference_obj := event["REFERENCE_OBJ"]).documentation.filter(datetime_start=event["DTSTART"].dt, datetime_end=event["DTEND"].dt)).exists() else
+                if (existing_documentations := (event_reference_obj := event["REFERENCE_OBJECT"]).documentation.filter(datetime_start=event["DTSTART"].dt, datetime_end=event["DTEND"].dt)).exists() else
                 cls(
                     pk=f"DUMMY;{event_reference_obj.id};{event['DTSTART'].dt.isoformat()};{event['DTEND'].dt.isoformat()}",
                     lesson_event=event_reference_obj,