Add custom cover image support for datasets

[xuang7]

Feature Summary

Currently, datasets in the hub/home page use the same default background image. This feature adds the ability for dataset owners to set a custom cover image from files within their dataset, making datasets more visually distinctive and easier to identify.

Current public datasets display as:

Proposed Solution or Design

The new design allows users with write access to designate any image file within their dataset as the cover image. The cover image is version-specific and persists when the dataset is renamed or ownership changes.

Public datasets with a customized cover display as:

Impact / Priority

(P2)Medium – useful enhancement

Affected Area

Hub, Storage / Metadata