style: Sidebar navigation custom scrollbar

[adibmed]

Summary

Show a Custom Navigation scrollbar, and only when hovering on the List.

Test Plan

Just Preview

Screenshots

Before	After

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🔍 Inspect: https://vercel.com/qurancom/quran-com/7Nmh4NMSnnqTCqc4go3nmQa9tFm9
✅ Preview: https://quran-com-git-fork-adibemohamed-master-qurancom.vercel.app