Shopfloor Checkout Package Measurement Mobile

This module extends the mobile shopfloor checkout process with a new screen where workers record package measurements. When the checkout scenario reaches the package measurement step, the app shows the picking and package details, then a form with fields for Length, Width, Height and Shipping Weight.

• Only the measurements required for the package are displayed; optional fields are hidden.
• Each required measurement must be a positive number, otherwise the form shows an error and blocks the Done button.
• The unit of measure shown next to each field comes from the package configuration (dimension unit for dimensions, weight unit for weight).
• Pressing Done sends only the required measurements to the server through the set_package_measurement call, along with the picking and package identifiers.
• A Back button lets the worker return to the previous step without saving.

The module works together with shopfloor_checkout_package_measurement, which provides the server-side logic, and shopfloor_mobile, which provides the mobile app framework. It does not add new menus or models; it only injects the new screen into the existing checkout scenario of the shopfloor mobile application.