fix: exclude non-groupBy date fields (deletedAt) from calendar field selection (#21764)

Closes #21608

The Tasks Calendar renders an empty grid because `GroupByTasks` fails
with `Field "deletedAt" is not supported in groupBy` while the header
count (`AggregateTasks`) still succeeds.

The calendar renders by grouping records on the selected date field.
Calendar-field eligibility only checked `isFieldMetadataDateKind`, so
`deletedAt` (a system DATE_TIME field) could be picked or auto-defaulted
as the calendar field — and the groupBy engine correctly rejects it
(only `createdAt`/`updatedAt` are groupable system date fields).

Fix: gate calendar-field eligibility on
`isFieldMetadataSupportedInGroupBy` (the same authority the backend
groupBy validator uses), so non-groupable date fields can no longer be
selected.

- `useGetAvailableFieldsForCalendar` — add the groupBy-support check
alongside the date-kind filter
- `ObjectOptionsDropdownCalendarFieldsContent` — reuse the hook's list
instead of re-filtering raw fields

packages/twenty-front/src/modules/object-record/object-options-dropdown/components/ObjectOptionsDropdownCalendarFieldsContent.tsx

@@ -13,7 +13,6 @@ import { useGetAvailableFieldsForCalendar } from '@/views/view-picker/hooks/useG
 import { useSetAtomState } from '@/ui/utilities/state/jotai/hooks/useSetAtomState';
 import { useLingui } from '@lingui/react/macro';
 import { useState } from 'react';
-import { isFieldMetadataDateKind } from 'twenty-shared/utils';
 import { IconChevronLeft, IconSettings, useIcons } from 'twenty-ui/icon';
 import { MenuItem, MenuItemSelect } from 'twenty-ui/navigation';
 
@@ -27,14 +26,12 @@ export const ObjectOptionsDropdownCalendarFieldsContent = () => {
 
   const { currentView } = useGetCurrentViewOnly();
   const { updateCurrentView } = useUpdateCurrentView();
-  const { navigateToDateFieldSettings } = useGetAvailableFieldsForCalendar();
+  const { availableFieldsForCalendar, navigateToDateFieldSettings } =
+    useGetAvailableFieldsForCalendar();
 
   const setRecordIndexCalendarFieldMetadataId = useSetAtomState(
     recordIndexCalendarFieldMetadataIdState,
   );
-  const availableFieldsForCalendar = objectMetadataItem.fields.filter((field) =>
-    isFieldMetadataDateKind(field.type),
-  );
 
   const calendarFieldMetadata = currentView?.calendarFieldMetadataId
     ? objectMetadataItem.fields.find(