Fix note linked text in timeline view (in dark mode) (#6944)

This PR Fixes https://github.com/twentyhq/twenty/issues/6942

Other improvements : 
- Fetch activities (note and task) title only when loading timeline, so
we don't always have a clickable title.
- Fixed IconButton width regression.

---------

Co-authored-by: Lucas Bordeau <bordeau.lucas@gmail.com>

packages/twenty-front/src/modules/activities/timelineActivities/components/EventRow.tsx

@@ -3,7 +3,8 @@ import { useContext } from 'react';
 import { useRecoilValue } from 'recoil';
 
 import { TimelineActivityContext } from '@/activities/timelineActivities/contexts/TimelineActivityContext';
-import { useLinkedObject } from '@/activities/timelineActivities/hooks/useLinkedObject';
+
+import { useLinkedObjectObjectMetadataItem } from '@/activities/timelineActivities/hooks/useLinkedObjectObjectMetadataItem';
 import { EventIconDynamicComponent } from '@/activities/timelineActivities/rows/components/EventIconDynamicComponent';
 import { EventRowDynamicComponent } from '@/activities/timelineActivities/rows/components/EventRowDynamicComponent';
 import { TimelineActivity } from '@/activities/timelineActivities/types/TimelineActivity';
@@ -100,7 +101,7 @@ export const EventRow = ({
 
   const { labelIdentifierValue } = useContext(TimelineActivityContext);
   const beautifiedCreatedAt = beautifyPastDateRelativeToNow(event.createdAt);
-  const linkedObjectMetadataItem = useLinkedObject(
+  const linkedObjectMetadataItem = useLinkedObjectObjectMetadataItem(
     event.linkedObjectMetadataId,
   );