update Notes & Tasks to display the first-letter icon (#15729)

Closes https://github.com/twentyhq/twenty/issues/15630

## Description
I've updated the Notes & Tasks to display the first-letter icon.

I only applied this change to the SummaryCard component to avoid
conflict with the content of
https://github.com/twentyhq/twenty/issues/6486.

## Test
<img width="1155" height="178" alt="スクリーンショット 2025-11-09 19 02 41"
src="https://github.com/user-attachments/assets/3b065f94-7bb8-4ba9-a0f0-3c32fb556e7e"
/>
<img width="1158" height="229" alt="スクリーンショット 2025-11-09 19 02 23"
src="https://github.com/user-attachments/assets/884ff3b6-2c48-4557-8b45-64f94a8fd6a1"
/>

Co-authored-by: Takuya Kurimoto <takuya004869@gmail.com>

packages/twenty-front/src/modules/object-record/record-show/components/SummaryCard.tsx

@@ -1,4 +1,3 @@
-import { useGetStandardObjectIcon } from '@/object-metadata/hooks/useGetStandardObjectIcon';
 import { useLabelIdentifierFieldMetadataItem } from '@/object-metadata/hooks/useLabelIdentifierFieldMetadataItem';
 import { useObjectMetadataItem } from '@/object-metadata/hooks/useObjectMetadataItem';
 import { CoreObjectNameSingular } from '@/object-metadata/types/CoreObjectNameSingular';
@@ -45,7 +44,6 @@ export const SummaryCard = ({
       objectRecordId,
     });
 
-  const { Icon, IconColor } = useGetStandardObjectIcon(objectNameSingular);
   const isMobile = useIsMobile() || isInRightDrawer;
 
   const recordIdentifier = useRecoilValue(
@@ -74,8 +72,6 @@ export const SummaryCard = ({
       isMobile={isMobile}
       id={objectRecordId}
       logoOrAvatar={recordIdentifier?.avatarUrl ?? ''}
-      icon={Icon}
-      iconColor={IconColor}
       avatarPlaceholder={recordIdentifier?.name ?? ''}
       date={recordCreatedAt ?? ''}
       loading={