v0.2.0

• Major overhaul of the UI using Spectre.Tui
  • Spectre.Tui-based UI: Reworked the duplicate results viewer and scan progress into a full TUI experience (DuplicateResultsViewer, CacheViewer, and supporting components), which keeps the UI rendering directly to the terminal rather than adding new lines
• New file hash caching system
  • File hash caching: Persistent file hash cache stored in app storage to speed up repeat scans (FileHashCache, CacheCommand, cache viewer TUI)
  • Cache viewer: See the list of currently cached file data with options for deleting some/all entries
• Export scan results
  • Scan result export: Export scan results to JSON for later review (E shortcut, to current path)
• Usability improvements
  • Navigation: Navigate around match list with paging and home/end key support
  • Match detail improvements: Show modified date and full root path in duplicate details view
  • Display consistency: Unify file size formatting (0.00 display)
  • Usability: Switched from yellow to orange for better readability on light terminal backgrounds