feat(ui): more batch data types

[psychedelicious]

Summary

• String batch node
• String generator SPLIT ON CHAR
• Integer batch node
• Integer range generator START-STEP-COUNT
• Stretch goal: Integer range generator MIN-MAX (RANDOM)
• Stretch goal: Integer range generator START-END-COUNT
• Stretch goal: Integer range generator PARSE STRING
• Float batch node
• Float range generator START-STEP-COUNT
• Stretch goal: Float range generator MIN-MAX (RANDOM)
• Stretch goal: Float range generator START-END-COUNT
• Stretch goal: Float range generator PARSE STRING
• Image collection supports duplicate images

A followup PR will add support for pairwise batching.

Supporting internal changes:

• Reorganize & abstract field validation logic

QA Instructions

Try it out!

Generator UI:

Screen.Recording.2025-01-13.at.9.06.07.pm.mov

Merge Plan

Targeting v5.6.1.

Checklist

• The PR has a short but descriptive title, suitable for a changelog
• Tests added / updated (if applicable)
• Documentation added / updated (if applicable)
• Updated What's New copy (if doing a release after this PR)

[psychedelicious]

My first go at the generators made them an alternative value for collection fields that was embedded in the workflow. So in the workflow, a float collection would either be a list of floats or the generator config (e.g. start, step and count). When you load a saved workflow, if the collection was set up as a generator, you'd get the generator UI instead of a list of numbers.

This worked but it modified the workflow schema, which is undesirable as it increases maintenance burden, complexity and implies some amount of lock-in.

I reverted those changes and made the generators a purely UI thing. The frontend logic is much simpler and the UX is similar. The only downside is that the generator isn't saved to the workflow, which was kinda nice.

Overall this simpler approach feels right to me. It also makes it much easier to add more complex generators - like non-linear ranges. It also opens the door to using dynamic prompts as a generator, which is pretty cool.