performance: lazy load nav menu content

[nhsz]

Description

• extracts MenuContent component
• MenuContent lazy loading
• updates Nav/Menu component
• updates @radix-ui imports to bring only neccesary components

[netlify]

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Lighthouse	7 paths audited Performance: 47 (🟢 up 9 from production) Accessibility: 92 (no change from production) Best Practices: 89 (🔴 down 3 from production) SEO: 93 (no change from production) PWA: - View the detailed breakdown and full score reports

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[wackerow]

Interface seems to be working well, nice job @nhsz! Looks like the Lighthouse performance metric is scoring about 9 points higher.

[pettinarip]

LGTM!