Improvements made:
- Expand drop target to entire view area for better UX
- Add support for multiple UTTypes (.fileURL, .data, .audio, .movie)
- Improve file validation with both extension and UTType checking
- Add security scoped resource handling
- Enhanced error logging for debugging
- Support more audio formats (AAC, FLAC, CAF)
This resolves issues where dragging files from desktop/Finder would not work while manual file selection did.
