fix: respect reduced motion on landing

[HaroldTheAI]

Summary

• add a reusable prefers-reduced-motion hook for landing motion components
• disable mouse parallax, tilt/magnetic hover transforms, floating particles, reveal/stagger effects, animated counters, gradient text motion, and hero entrance/float animations for reduced-motion users
• add a global reduced-motion CSS safety net for continuous animations/transitions

Closes #12

Verification

• git diff --check ✅
• npx tsc --noEmit --noImplicitAny false --skipLibCheck ✅

Notes:

• npm run lint currently stops at Next.js' interactive ESLint setup prompt because the repo has no ESLint config yet.
• npm run build starts compiling but the local Raspberry Pi build worker exits with SIGBUS; this appears environment/resource-related after dependency install completed.

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