Fix client-only dynamic import examples

[gauravsaxena1997]

Summary

• Moves the Analytics ssr: false dynamic import example behind a Client Component boundary.
• Adds use client to the Monaco dynamic import example.
• Regenerates skills/react-best-practices/AGENTS.md and extracted test cases.

Why

This addresses #216, where React best-practices examples used ssr: false dynamic imports in contexts that looked like Server Components.

Validation

• pnpm validate
• pnpm build
• git diff --check

[vercel]

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