**What** - fix `prepareConfirmInventory` to account for inventory kit items - _note: this step is reused in the complete cart and all RMA flows_ - properly remove reservations for items that are removed from the order edit - invalidate inventory/reservations cache when order edit is confirmed --- https://github.com/user-attachments/assets/f12e9198-0718-4c08-bd81-efc536eca146 --- FIXES CC-565