message: fix: update Button loadingText type
  Doesn't specifically need to be a string
diff: @@ -35,7 +35,7 @@ export interface IButton {
  * The label to show in the button when `isLoading` is true
  * If no text is passed, it only shows the spinner
  */
  - loadingText?: string;
  + loadingText?: React.ReactNode;
  /**
  * If `true`, the button will take up the full width of its container.
  */
  