Restyle buttons according to updated mockups

[antonok-edm]

The current button designs are outdated.

They should be updated to look like the ones in this mockup:

In dark mode, "Default" style buttons should be styled as follows: white text and #c2c4cf border, Hover style should be #FF7654 bold, weight: 700 text and #FF7654 border. Focused treatment is white text, #FF7654 border with 3px #FF7654 40% alpha border. and pressed state is #FF7654 text and #FF7654 border with 3px #FF7654 40% alpha border

"Primary" style buttons are identical between dark and light themes.