Add support for ordering Category sections in the Brand Store based on the Index values configured in inRiver PIM.

How:
Allow Brand Store to read and apply the “Index” field from Category entities in inRiver PIM, or provide a UI option within Brand Store to manually reorder category sections.

Why:
Currently, Brand Store ignores the configured Category Index values, resulting in sections appearing in a random or unexpected order. This creates inconsistency between how categories are structured in PIM and how they appear to end users in the Brand Store.

For Who:
PIM administrators, content managers, and Brand Store users who rely on consistent and structured product presentation.

Impact:
Improves product detail page clarity and user experience, ensures accurate representation of product content structure, reduces confusion for internal teams, and avoids manual workarounds.

Additional context:
Support confirmed that Brand Store does not currently support sorting or reordering category sections. Only field sorting within a category is available. Sorting categories themselves requires a new functionality.