feat(ui): upscaling & ad-hoc post-processing misc

[psychedelicious]

Summary

Round of updates & fixes for upscaling tab and ad-hoc post-processing (previously called ad-hoc upscaling). Mostly fixing verbiage and splitting off the post-processing UI from the upscaling UI.

One other notable change:

• feat(nodes): split spandrel node

  spandrel_image_to_image now just runs the model with no changes.

  spandrel_image_to_image_autoscale runs the model repeatedly until the desired scale is reached. previously, spandrel_image_to_image did this.

The ad-hoc post-processing feature uses spandrel_image_to_image. It processes the image using the model without any special handling. The upscaling tab uses spandrel_image_to_image_autoscale - its behaviour is unchanged.

Related Issues / Discussions

n/a

QA Instructions

The ad-hoc upscale popover UI is updated with its new identity as a post-processing popover.

post.popover.mov

Because we now refer to spandrel models as "image to image", "upscale" and "post-processing" models in different places, the starter models search is updated to understand these search terms.

starter.models.search.mov

All generation functionality - both upscaling tab and post-processing popover - should be unchanged.

Merge Plan

n/a

Checklist

• The PR has a short but descriptive title, suitable for a changelog
• Tests added / updated (if applicable)
• Documentation added / updated (if applicable)