State helpers

Utilities for communicating state in the DOM.

Quick reference

Class	Styles
`af-is-disabled`	`opacity: 0.6; cursor: not-allowed; pointer-events: none`
`af-is-loading`	`opacity: 0.7; pointer-events: none`
`af-is-active`	`opacity: 0.9`
`af-is-muted`	`opacity: 0.6`
`af-has-error`	`border-color: var(--af-color-danger)`
`af-has-focus`	`border-color: var(--af-color-primary)`

Disabled

<button class="af-btn af-is-disabled">
  Disabled
</button>