Better Tailwind classes interface

We want to build a better interface for editing and managing Tailwind classes. Some ideas are:
- allow to easily switch between similar classes (e.g. with dropdowns for text size, text color, etc.)
- preview the effect of a class on the canvas by hovering it.
- Group classes by semantics/variants
- Sort classes
- Disable class without deleting it to quickly see how it affects the styles
- Better autocomplete
- Navigate, edit and delete classes with shortcuts