fix: custom theme property for RadioButtonItem component

[alexzel]

This PR contains two fixes for RadioButtonItem when passing custom colors through theme property:

theme={{
  colors: {
     onSurface: ....,
     onSurfaceDisabled: ...,
  },
}}

1. Fix for type error:

error TS2740: Type '{ onSurface: string; onSurfaceDisabled: string; }' is missing the following properties from type 'MD3Colors': primary, primaryContainer, secondary, secondaryContainer, and 27 more.

Solution: Change theme type to ThemeProp.

2. Radio button icon does not apply disabled color from custom onSurfaceDisabled theme color.

Solution: pass theme down to the components handling icon colors.

[callstack-bot]

Hey @alexzel, thank you for your pull request 🤗. The documentation from this branch can be viewed here.