feat: add className prop to EaseView component and corresponding test

[EQuimper]

Summary

Added className prop to EaseView for NativeWind compatibility.

What changed

src/EaseView.tsx — Added className?: string to EaseViewProps. Since className is not destructured, it flows through {...rest} to the native view automatically. NativeWind's babel transform intercepts it before it reaches native.

src/__tests__/EaseView.test.tsx — Added test verifying className is forwarded as a prop.

How it works

Users with NativeWind in their project can now use Tailwind classes on EaseView:

<EaseView
  className="w-24 h-24 rounded-2xl bg-indigo-500"
  animate={{ scale: pressed ? 1.2 : 1 }}
  transition={{ type: 'spring', damping: 12 }}
/>

NativeWind's babel plugin transforms className into a style prop at build time — EaseView just needs to accept and forward it.