Wire NavLogger into track save/load pipeline

TrackStorage now writes to NavLogger at every decision point:
- Before MediaStore insert (shows the filename being written)
- Successful save: "saved nav_<ts>.gpx (N bytes) → <uri>"
- Every failure path: storage not mounted, insert null,
  openOutputStream null, write exception, load parse error
- After loadViaMediaStore: count of tracks found

TrackRepository logs stopTrack summary (pts / duration / distance)
and explicitly logs when saveTrack returns false.

Long-press the drag handle after injecting a test track to see
exactly where the save pipeline breaks.

https://claude.ai/code/session_01HXPjBsogsJVRwCiekDGkJX

0 files changed, 0 insertions, 0 deletions