fix(calendar): becomes invisible if resizing while not visible

apps/client/src/widgets/view_widgets/calendar_view.ts

@@ -165,6 +165,7 @@ export default class CalendarView extends ViewMode {
             locale: await CalendarView.#getLocale(),
             height: "100%",
             nowIndicator: true,
+            handleWindowResize: false,
             eventDidMount: (e) => {
                 const { iconClass, promotedAttributes } = e.event.extendedProps;
 
@@ -233,6 +234,9 @@ export default class CalendarView extends ViewMode {
         calendar.render();
         this.calendar = calendar;
 
+        new ResizeObserver(() => calendar.updateSize())
+            .observe(this.$calendarContainer[0]);
+
         return this.$root;
     }