feat: Implement MOB (Man Overboard) alarm functionality

This commit introduces the core functionality for the Man Overboard (MOB) alarm.

Key changes include:
- Added a persistent, high-contrast red MOB Floating Action Button to the UI.
- Implemented dynamic location permission requests and initialization of LocationService.
- Created a MobWaypoint data class to store MOB location and timestamp.
- Developed the activateMob() function to:
  - Capture current GPS coordinates.
  - Set the active MOB waypoint and mark MOB as activated.
  - Switch to a dedicated MOB navigation view, hiding other UI elements.
  - Start a continuous, looping audible alarm (assumes R.raw.mob_alarm exists).
  - Log the MOB event to the console (placeholder for future logbook integration).
- Implemented a MOB navigation view (ConstraintLayout) with real-time distance to MOB and elapsed time display.
- Added a recoverMob() function, triggered by a 'Recovered' button, to:
  - Deactivate MOB mode.
  - Stop and release the audible alarm.
  - Restore the main UI visibility.
- Location updates are observed to continuously update the MOB navigation display.
- Ensured MediaPlayer resources are properly released on activity destruction.

Future enhancements (not part of this commit) include:
- Implementing a bearing arrow in the MOB navigation view.
- Integrating with a persistent logbook system.

0 files changed, 0 insertions, 0 deletions