Set Column Right-Border Widths (Merchandise Planning)

Merchandise Planning now lets you set a right border width on any column (1px, 2px, or 3px) from the column header right-click menu — borders apply immediately, can be toggled off by selecting the same width again, and are saved with your view so they persist across sessions.

This makes dense grids easier to scan and helps visually separate or group columns without changing layout. The same capability will be added to Assortment Plan and Allocation in the weeks to come.