- Add comprehensive Find & Replace with match highlighting
- Add toggleable line numbers with theme support
- Implement full undo/redo functionality with keyboard shortcuts
- Add smart auto-indentation for lists and code blocks
- Enhanced keyboard shortcuts for productivity
- Advanced tab handling for indentation/outdentation
- Updated About dialog with v1.2.0 and complete feature list
- Add Find & Replace to Edit menu
- Updated README.md with comprehensive feature documentation
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