Adjust wholesale inventory when retail items are marked shipped

Shipped retail line items aren't lowering wholesale stock counts, causing fulfillment confusion and oversells. Align wholesale inventory with shipments so fulfillment can avoid stockouts same day.

Overview

When retail shipments don't decrease wholesale stock, fulfillment and accounting spend hours reconciling counts. This flow automatically adjusts wholesale quantities as items ship, giving inventory managers accurate counts within minutes so channels avoid oversells.