Paste (or load from a file) a prompt manifest — the same JSON format the
default-image generator reads: an items array, where each
item has a category (e.g. "company", "product"), a required
itemId, a label, and an imagePrompt.
groupKey is optional (use it for grouped items, like a
company type — leave it out for a flat list like products).
Submitting saves this manifest to the S3 key below, then queues one
background image-generation job per item. Generated images land
directly in the bank below as Pending Review — use
Search Images to review, edit the prompt, regenerate, or approve them.
This calls the Grok image API and may incur cost.