Stock vertical lift qty by packaging

This module is a small bridge between two existing features: the vertical lift transfer screen and the display of quantities by packaging. On the vertical lift operation transfer screen, the standard fields for the unit of measure and the plain quantity are hidden.

In their place, a new text field shows the quantity expressed as full packaging plus remaining units. This value is calculated automatically from the current move line and refreshes whenever the quantity on that line changes.

• The screen still belongs to the vertical.lift.operation.transfer model, so warehouse operators keep working in the same place.
• No new menu, button, report or scheduled action is added.
• No new business rule, restriction or email is introduced; the module only changes what is displayed.

The module installs automatically when both stock_product_qty_by_packaging and stock_vertical_lift are present, so users do not need to install it manually. It touches only the vertical lift transfer screen and the related operation model.