Implement react-layered for Z-Index Management

[poeck]

I've created and integrated a new npm package called react-layered into the project. This package introduces a straightforward hook that simplifies managing z-indexes across the application, especially useful as the project scales.

I've replaced the previous manual z-index management with this hook where applicable. This should help avoid z-index conflicts and make our styling more maintainable.

[vercel[bot]]

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