- Remove the sidebar duplicate JS that would also add a ready class but NOT after a settimeout, only after the component renders
- This means we now have one location in the code that does this, driven by Stimulus
- Update the Storybook preview JS so that we can rely on similar behaviour in Storybook for transitions
- default / named exports are used in varying places and it is not a critical blocker for future code
- disable this rule and in the future it can be re-assessed or moved to the core wagtail eslint config
