- Remove complex style preservation system from editor
- Simplify markdown conversion back to straightforward approach
- Remove StyleContext class and style-aware conversion methods
- Switch content type from 'html' back to 'markdown' for consistency
- Clean up editor workflow to focus on core markdown editing
- Remove ~500 lines of unnecessary style complexity
This completes the UI unification cleanup by removing the overly complex
style preservation system that was making the editor harder to maintain.