Adopt shared WebUI layout primitives

webui/src/features/calendar/CalendarCollectionDialogs.tsx

@@ -352,7 +352,7 @@ export function CalendarCollectionDialog({
     <Dialog
       open
       title={isEdit ? "i18n:govoplan-calendar.edit_calendar.a47a2a7a" : "i18n:govoplan-calendar.add_calendar.8fadb5bc"}
-      className="calendar-event-dialog"
+      size="large"
       footerClassName="calendar-event-dialog-footer"
       closeDisabled={saving}
       onClose={onCancel}

webui/src/features/calendar/CalendarEventDialog.tsx

@@ -281,7 +281,7 @@ export function CalendarEventDialog({
     <Dialog
       open
       title={event ? "i18n:govoplan-calendar.edit_event.a7028454" : "i18n:govoplan-calendar.new_event.2ef3795c"}
-      className="calendar-event-dialog calendar-vevent-dialog"
+      className="calendar-vevent-dialog"
       footerClassName="calendar-event-dialog-footer"
       closeDisabled={saving}
       onClose={onCancel}

webui/src/styles/calendar.css

@@ -850,10 +850,6 @@
   font-weight: 800;
 }
 
-.calendar-event-dialog {
-  width: min(680px, 100%);
-}
-
 .calendar-vevent-dialog {
   width: min(920px, 100%);
 }