- Add sticky navigation bar with section links
- Add reading progress bar (green glow, top of page)
- Add Open Graph and Twitter Card meta tags for social sharing
- Add all 18 chapters organized by part (The Man / Inscription / Network)
- Chapter links point to source on Gitea
- Add David and The Builder character cards
- Add 'Read Full Manuscript' and 'View Source' CTAs
- Add scroll-triggered fade-in animations
- Add ambient rain sound toggle (placeholder audio)
- Add 'Back to top' footer link
- Character cards now have hover effects
- Responsive improvements for mobile
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