Add column grand totals (Staffing, Hours, Agents) to the Net Difference table when viewing "Actual vs Scheduled" or "Actual vs Required" comparisons in the Heatmaps report, similar to what's available in other tables of this report.

Currently, when users select "Actual vs Scheduled" or "Actual vs Required" in the Heatmaps report, the Net Difference table doesn't display column grand totals that are available in other tables. This inconsistency creates confusion for users who expect similar functionality across all tables in the report and prevents them from seeing aggregate information for net differences.