Persist log entries and photos; stamp with GPS location

- LogbookStorage: Moshi-backed JSON persistence to getExternalFilesDir,
  photos saved to Pictures/Nav/ instead of cache
- LogbookRepository: file-backed replacement for in-memory store, loads
  saved entries on init so they survive app restarts
- VoiceLogViewModel: expose entries StateFlow, accept lat/lon in save()
- VoiceLogFragment: switch camera to TakePicture(Uri) via FileProvider for
  full-res photos; gallery copies content URI to persistent storage;
  passes current GPS position to save(); shows scrollable entries list
- MainViewModel: expose currentPosition StateFlow updated on each GPS fix
- AndroidManifest: add FileProvider for Pictures/Nav/ directory
- TripReportViewModel: updated to use LogbookRepository

https://claude.ai/code/session_01YUbuZNDAoLea4cf9UGQ9qn

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