[codex] Code-split landing page sections

[MyouzzZ]

Summary

• code-split below-the-fold landing sections with
  ext/dynamic
• keep a minimal section fallback so the snap layout keeps stable viewport-sized panels while chunks load
• remove the always-truthy Hero ? Hero : HeroArctic branch so the unused arctic/3D hero path is not pulled into the landing route

Performance impact

The landing page no longer statically imports every middle/bottom section in the initial client module. Heavy sections such as charts, proof/feed panels, waitlist, FAQ, and CTA/footer can load as separate chunks after the first route module, reducing initial parse/evaluation pressure for the homepage.

Validation

• Static review against clients/web/app/page.tsx and exported component names.
• Not run: full
  ext build/lint locally because this Codex environment does not have the repo dependencies installed and prior full clones from GitHub were unreliable.

Refs #2

[vercel]

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