Refactor nav's load

[pettinarip]

Description

This PR cleans up the loading exp for the nav a bit.

• remove the isDesktop hook and replace the logic behind it with media queries using useBreakpointValue. This fixes an edge case where large mobile screens or tablets would not load the desktop menu.
• make most of the nav components client-rendered. This improves the UX by showing the interactive components only when they are ready to be interactive, not before.

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