Remove postition from Timeline Activities + fix workflow title placeholder (#18777)

- Position were not properly displayed because we never implemented a
display for this
- Untitled placeholder was not displayed anymore
<img width="359" height="117" alt="Capture d’écran 2026-03-19 à 17 11
25"
src="https://github.com/user-attachments/assets/64c90d81-8262-4176-ae25-804748e36b1e"
/>

packages/twenty-front/src/modules/object-record/record-title-cell/components/RecordTitleCellTextFieldDisplay.tsx

@@ -7,6 +7,7 @@ import { getRecordFieldInputInstanceId } from '@/object-record/utils/getRecordFi
 import { styled } from '@linaria/react';
 import { t } from '@lingui/core/macro';
 import { useContext } from 'react';
+import { isDefined } from 'twenty-shared/utils';
 import { OverflowingTextWithTooltip } from 'twenty-ui/display';
 import { themeCssVariables } from 'twenty-ui/theme-constants';
 
@@ -41,8 +42,8 @@ export const RecordTitleCellSingleTextDisplayMode = ({
 
   const recordStore = useAtomFamilyStateValue(recordStoreFamilyState, recordId);
 
-  const isEmpty =
-    recordStore?.[fieldDefinition.metadata.fieldName]?.trim() === '';
+  const fieldValue = recordStore?.[fieldDefinition.metadata.fieldName];
+  const isEmpty = !isDefined(fieldValue) || fieldValue.trim() === '';
 
   const { openRecordTitleCell } = useRecordTitleCell();