fix: respect reduced motion preference

[xx7412421-cloud]

Closes #12

Summary

• add a shared prefers-reduced-motion hook for landing motion components
• stop parallax, tilt, magnetic hover, marquee, gradient, counter, reveal, and hero entrance motion when reduced motion is requested
• add a global CSS reduced-motion fallback for continuous animations and transitions

Validation

• npm run build
• npx tsc --noEmit
• git diff --check

Note: npm run lint still opens the repository's first-time Next.js ESLint setup prompt, so it cannot complete non-interactively without changing project config.

[vercel]

@xx7412421-cloud is attempting to deploy a commit to the Cbiux's projects Team on Vercel.

A member of the Team first needs to authorize it.