What problem does this address?

The image 'lightbox', as currently named, may be unintuitive and jargony. We should consider renaming the lightbox to something more user friendly.

What is your proposed solution?

I don't myself have many ideas for the moment, but perhaps something with 'expand' or 'enlarge' could work.

I'm also happy to go with 'lightbox,' but I understand there were varying opinions around this so thought I would open an issue to discuss.