Updates the `createBackorderConfirmation` API call to dynamically specify whether to create a backorder (reliquat) or not.
Introduces a `toBackorder` parameter, enabling the API to handle both "with backorder" and "without backorder" scenarios based on user selection. This centralizes the backorder status setting within a single API call.
Additionally, adds loading indicators to the backorder dialog buttons for improved user feedback during the confirmation process.
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