- Replace legacy editor with clean object-oriented architecture
- Add comprehensive test-driven Section, SectionManager, and DOMRenderer classes
- Implement four-layer content management with proper action semantics
- Add multiple concurrent section editing capability
- Implement intelligent section splitting with heading detection
- Add enhanced status dialog with repository info, version, and save filename
- Include git commit information and modification status
- Provide actual save filename preview instead of source filename
- Maintain proper section positioning and global reset functionality
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Co-Authored-By: Claude <noreply@anthropic.com>