Add the dark mode UI support in the blocks/button for all the variants. Currently the UI for button is same in both light and dark mode.
Also match the current UI for light mode for all the button variants and update the button CSS where it doesn't matches with the updated figma designs:
https://www.figma.com/design/FvJL0JWHlsVohsHTERB1Lh/Push-Design-Foundations-[Future]?node-id=228-4983&t=WgMrDZGM04zGJFRn-0