Onboarding Pagination Indicator - Reanimated

Reusable onboarding pagination indicator using React Native Reanimated - layout animations, entering and exiting animations, as well as creating a springy animation using `useDerivedValue` based on a number (`selectedIndex`) that's coming as a prop and animate the pagination itself. We’re also animating the "Next" button to reflect the state of the onboarding process. If the user is on the final slide, the button text smoothly changes from `Continue` to `✅ Finished`, signaling the end of the flow. This change is animated to feel smooth and responsive. There's a live stream session on [YouTube](https://www.youtube.com/watch?v=mL3Ry32QS8A) if you want to see how this was implemented.