Optimize mobile nav

[pettinarip]

Description

• nav — code refactors & reorganization
• menu — ssr content
• menu — replace accordions with collapsibles (collapsible is a primitive of the accordion component) to improve performance with nested trees
• menu — remove Sheet overlay and hamburger animation to reduce main thread usage
• language picker — pre-calculate languages on the server
• language picker — pre-calculate progress on the server
• language picker — open content inside the existing Sheet container instead of creating a new Dialog

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Lighthouse	7 paths audited Performance: 42 (🔴 down 10 from production) Accessibility: 96 (🟢 up 1 from production) Best Practices: 92 (🔴 down 8 from production) SEO: 100 (no change from production) PWA: 59 (no change from production) View the detailed breakdown and full score reports

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[wackerow]

This is looking great 🔥, well done @pettinarip! Will be curious to see the impact here

[wackerow]

Shouldn't block, but perhaps we rename this to loading for consistency with other loading components?

[pettinarip]

Hmm, but the intention of fallback is that it can be anything (including null). On the other hand, loading narrows the scope, leading developers to think they should only use loading UIs, which isn’t correct.