Defaults shared by PrimaryButton and SecondaryButton.
Outline width.
Padding around the button content.
Size of leading / trailing icons.
Gap between an icon and the label.
Minimum button height.
Button corner shape.
Primary: surface fill, primary border and content; disabled uses disabled.
surface
primary
disabled
Secondary: surface fill, outlineStrong border, accent content; disabled uses disabled.
outlineStrong
accent