Fixed JavaScript method call errors that were blocking content display:
- Fix sectionManager.getSection() → sections.get() method calls
- Fix section.isModified() → section.hasChanges() method calls
- Add missing getDocumentStatus() method to SectionManager class
Added comprehensive content rendering validation test to catch future issues.
Enhanced section styling system with 17 advanced styling methods.
All content now renders successfully with full JavaScript functionality.
🤖 Generated with [Claude Code](https://claude.ai/code)
Co-Authored-By: Claude <noreply@anthropic.com>
