Add Gift Message Field to List Exports

🔍 Problem Statement

The gift message field is currently available in the fulfillment export but is missing from the list export. Since the list export is the primary export used for shipment creation, the absence of the gift message field prevents the team from accessing important gifting information during the fulfillment workflow.

💡 User Story

As an operations user generating shipment list exports, I want the gift message field to be included in the list export so that gifting information is available during shipment preparation and processing.

🎯 Definition of Done (DoD)

A feature is done when:

✔ The gift message field is added to the list export.

✔ Gift messages are populated correctly.

✔ Empty or non-gift orders do not cause export issues and display a blank/null value where applicable.

✔ The gift message column is included consistently in generated CSV/export files.