fix: saved tracks overlay, GPX file handler, nav import

Saved tracks overlay was immediately hidden after showing because
bottomNav.selectedItemId = nav_map fires the nav item listener, which
calls hideOverlays(). Removed that line — the map tab is already
selected when the instrument sheet is open.

GPX file handler:
- Manifest: intent-filter for application/gpx+xml + singleTop launch
  mode so onNewIntent is called when app is already running
- MainActivity: handleIncomingGpx() called from onCreate + onNewIntent;
  parses the URI on IO dispatcher and hands points to ViewModel
- MainViewModel: addImportedTrack() prepends parsed points to pastTracks
  and savedTracks state flows (displayed in session only, not persisted)

https://claude.ai/code/session_01DNjbYxiC1cco83dArNGW3G

0 files changed, 0 insertions, 0 deletions