Operators want plates of the same size grouped together so material
doesn't need sorting when it arrives; there was no way to change plate
order. Rows can now be dragged to a new position (with a drop line and
edge auto-scroll), or moved with Alt+Up/Alt+Down. Each move is one
undoable "Move Plate" step and only reorders: quantities are untouched.
The trailing empty new-plate sentinel stays last. An empty plate moved
to the end becomes the sentinel, as the sentinel rule already does on
reload, so the order shown is the order saved.
Co-Authored-By: Claude Opus 5.5 <noreply@anthropic.com>