DJ USB Tkit 0.1.4

• Missing library source folders are now surfaced as recoverable UI state
  instead of being treated as deleted media during scan. Missing source chips
  render as warning chips, scan pruning ignores missing roots, and affected
  exports are blocked until the source is relocated or explicitly removed.
• Add source-root relocation for moved music folders. Relocation rewrites
  indexed track paths to the new folder while preserving track IDs and local
  playlist membership.
• Fix "Duplicate PDB entries" diagnostics failures that the offered strict
  parity repair could not actually resolve. Some playlists on
  long-lived, heavily-edited USBs had accumulated stale duplicate copies of
  a track's playlist membership in the device-side database; running the
  repair reported success without removing them. The repair now finds and
  removes the stale duplicates so affected playlists pass diagnostics.
• Fix strict parity reporting for playlist sort-order drift. eDB playlist
  sequence numbers that no longer match the device-facing PDB playlist order
  are now reported as ordering parity failures and routed through strict
  repair, which syncs eDB order back from PDB.
• Clicking a track row in a USB playlist or history list to load its
  waveform/BPM/key no longer rebuilds and repaints the entire visible track
  list — only the clicked row updates now, matching how the library view
  already behaves.