Returns creation and per-app user permissions

New Features

• Merchants can now create [Returns](https://docs.Next Commerce.com/manage/orders/create-and-manage-returns) for products that have been fulfilled through [Order Details](https://docs.Next Commerce.com/manage/orders/order-management#order-details-view) view.
• Non-admin dashboard users can now be given access to individual apps as needed.

Improvements

• We've implemented a new Unsaved Changes bar across the whole platform for more consistent UX.
• We've overhauled the Order Detail view and fulfillment orders for more clarity and ease of use.
• Fulfillment Partners have now been renamed to Locations for clarity and usability.
• Fulfillment Order Line items on the Admin API now include more product information to make these easily available for fulfillment integrations.
• Fulfillment Location Addresses are now validated to ensure the address follows standard address format expectations.
• Added additional fields to the Stockrecords Admin API to improve usability by external systems.
• Improve Taxes shown in orders and order confirmation views for more clarity when multiple tax rates are applied.

Bugs Fixed

• We now prevent users from deleting fulfillment locations that are associated with stockrecords and orders, to prevent cascading data dependency issues.
• Fixed an issue that prevented partners from being able to create apps.
• Fixed an edge case issue where the payment gateway was not stored with subscriptions when created.