Override default variants like KUMO_BUTTON_VARIANTS?

The Button default height is 9. For my personal taste it's a bit too tall. How are components meant to be customized project-wide?

Start at the Button component and trace how its default height and variants are defined. Determine whether the repository already exposes a project-wide customization entry point, then inspect related tests or documentation if present. Done means the supported customization behavior is explicit and verified, including the Button height example.

Written by the indexing model from the issue text.