- Fixed StructuredEditor auto-type detection to only trigger on empty fields
- Made array keys readonly with proper index display and full-width value inputs
- Enhanced PHP unserialize to handle empty strings, NULL values, and complex data
- Added JSON to CSV support for single objects as Key-Value format
- Upgraded DiffTool with react-diff-view for professional GitHub-style diffs
- Added theme-synchronized diff colors with proper contrast in light/dark modes
- Implemented red/green text on matching backgrounds for optimal readability
- Removed HTML Preview Tool from navigation menu in Layout.js
- Cleaned up unused Code import
- Added HTML Preview related files to .gitignore
- Project builds successfully without HTML Preview Tool
