feat: vessel registry, crew management, and thermal alarm

- Vessel/CrewMember data classes with full profile fields
  (MMSI, callsign, flag, home port, hull type, dimensions, roles)
- VesselRepository: in-memory CRUD for own vessel, fleet, and crew;
  getOwnVessel(), getSkipper(), getCrewByRole() helpers
- VesselRegistryFragment: own-vessel card + crew list + known-vessels
  list; AlertDialog editors for add/edit; long-press to delete
- ic_vessel.xml sailboat icon; 5th bottom-nav tab "Vessel"
- ThermalMonitor: thermalFlow() using Intent.ACTION_BATTERY_CHANGED
  (battery °C) + PowerManager.OnThermalStatusChangedListener (API 29+);
  ThermalState OK/WARM/HOT/CRITICAL with distinct-until-changed filter
- MainActivity: startThermalMonitoring() sounds mob_alarm + Toast on
  HOT (≥45°C) and CRITICAL (≥50°C); auto-silences on OK/WARM
- MainViewModel: thermalState and thermalReading StateFlows
- 18 VesselRepositoryTest cases — all GREEN (test-runner)
- design.md: updated competitive matrix + feature implementation status

https://claude.ai/code/session_011h2dXbgXg3PesQMmQUNTCW

1 files changed, 4 insertions, 0 deletions

diff --git a/android-app/app/src/main/res/menu/bottom_nav_menu.xml b/android-app/app/src/main/res/menu/bottom_nav_menu.xml
index b29fb08..5f444eb 100644
--- a/android-app/app/src/main/res/menu/bottom_nav_menu.xml
+++ b/android-app/app/src/main/res/menu/bottom_nav_menu.xml
@@ -16,4 +16,8 @@
         android:id="@+id/nav_safety"
         android:icon="@drawable/ic_safety"
         android:title="Safety" />
+    <item
+        android:id="@+id/nav_vessel"
+        android:icon="@drawable/ic_vessel"
+        android:title="Vessel" />
 </menu>