Ask: Add the Timeline custom field type to the Gantt view sidebar column picker.

The Timeline custom field is not currently available as a sidebar column in Gantt view, even though most other custom field types can be added. I'd like Timeline to be a supported column in the Gantt sidebar.

Why it matters: Timeline provides a single, clean date-range field instead of requiring two separate columns (start date and due date). For project managers working in Gantt view, being able to see a compact date range inline is much easier to scan than two individual date columns. It reduces clutter in the sidebar and keeps the focus on the chart itself.