Add compass functionality and shared preferences support to map tab

pubspec.yaml

@@ -53,6 +53,7 @@ dependencies:
 
   # Location services
   geolocator: ^14.0.2
+  flutter_compass: ^0.8.0
 
   # Utilities
   intl: ^0.20.2
@@ -63,6 +64,9 @@ dependencies:
   share_plus: ^10.1.3
   path_provider: ^2.1.5
 
+  # Persistent storage
+  shared_preferences: ^2.3.3
+
 dev_dependencies:
   flutter_test:
     sdk: flutter