feat: measure custom tab bar

[okwasniewski]

PR Description

This PR implements measuring of custom tab bar so it's properly returned in useBottomTabBarHeight().

How to test?

Check if useBottomTabBarHeight is not 0 if passed a custom tab bar.

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Latest commit: 4fc116b

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Pull Request Overview

This PR implements custom tab bar height measurement to ensure that useBottomTabBarHeight returns the correct value when a custom tab bar is provided.

• Adds a ref (customTabBarWrapperRef) and a useLayoutEffect hook to measure the tab bar height.
• Wraps the custom tab bar rendering in a View with the ref to facilitate measurement.