feat: integrate PlatformColor with alpha to replace stateLayerPressed #4972

We're currently using a pre-computed state layer color at press opacity (0.10) used for ripple effects. It avoids runtime alpha manipulation which was incompatible with PlatformColor on Android before RN 0.86.
Since RN 0.86, we can now have full support for the MD3 specs + DynamicColor (PlatformColor + alpha).

Buttons of all kinds (regular, icon, FABs etc) are one example of components that need a custom ripple color.
The goal is to replace ThemeColors.stateLayerPressed with a proper ripple treatment.