fix: broken hover in Navbar

[Daryna-del]

What/Why/How?

After migration styled-components to v6 we faced with some regression on hover in Navbar.

Reference

Testing

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• Tested
• All new/updated code is covered with tests

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[redocly]

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Note

Low Risk

This is a minor UI styling fix with no behavior or logic changes, addressing a syntax requirement introduced by a library upgrade. The blast radius is limited strictly to the visual hover state of a few Navbar components.

Overview

Updates CSS syntax in Navbar and NavbarItem to fix broken hover effects caused by a recent migration to styled-components v6. Specifically, it prepends the ampersand parent selector (&) to :hover pseudo-classes to ensure styles are correctly nested and applied.