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

@@ -532,10 +532,10 @@ class Documentation(CalendarEvent):
         # if so, add the documentation to a list, if not, create a new one
         return [
             (
-                event_reference_obj.documentation.first()  # TODO: probably show all documentations
-                if (event_reference_obj := event["REFERENCE_OBJ"]).documentation.exists() else
+                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
                 cls(
-                    pk=f"DUMMY:{event_reference_obj.id}",
+                    pk=f"DUMMY;{event_reference_obj.id};{event['DTSTART'].dt.isoformat()};{event['DTEND'].dt.isoformat()}",
                     lesson_event=event_reference_obj,
                     course=event_reference_obj.course,
                     subject=event_reference_obj.subject,