- Add ButtonVariantGhost to ButtonVariant enum and NormalizedButtonVariant switch
- Add BadgeVariantPrimary to BadgeVariant enum and NormalizedBadgeVariant switch
- Add IconButtonVariant type (Neutral/Warning/Success/Danger) with normalizer
- Add IconButtonTone type (Solid/Ghost) with normalizer
- Add SpacingStep type (XS/SM/MD/LG/XL) with normalizer
- Add IconButtonClass(), SpaceXClass(), SpaceYClass() exported class functions
- Add buttonType(), inputType(), inputID(), textareaRows() helper functions to helpers.go
- Fix TestButtonClass_GhostVariant assertion to match compound class format preserved for Plan 02