- Add DocumentNavigator UI element for document navigation across viewing and editing modes
- Implement lazy loading approach where control appears immediately but navigation content builds on-demand
- Position controls on left side following UI convention for consistent navigation experience
- Add scroll spy functionality for current section detection
- Include responsive design with mobile auto-hide
- Create comprehensive development guardrails to prevent JavaScript corruption
- Add JavaScript validation tool for syntax error detection
🤖 Generated with [Claude Code](https://claude.ai/code)
Co-Authored-By: Claude <noreply@anthropic.com>
