Allow changing the display format of system date fields (createdAt and updatedAt)

Description The system fields Creation date (createdAt) and Last update (updatedAt) are always displayed using the RELATIVE format, for example: > about 2 years ago In Settings → Data Model → Object → Creation date, the display-format selector is visible but disabled. Saving produces: > This field cannot be modified. The same restriction applies through the metadata API/MCP: Use case During a Salesforce migration, I successfully preserved the original Salesforce creation and modification timestamps in Twenty's native createdAt and updatedAt fields. Sorting works correctly, but users need to see the exact dates rather than relative values. Creating duplicate custom date fields solely to control presentation would be unnecessary and confusing. Expected behavior Workspace administrators should be able to configure presentation-only settings such as: or: Changing the display format should not affect the system-managed nature of the underlying timestamps. Curr…