feat: Enhance messaging and SAR marker functionalities

- Integrated SAR marker sending feature in MessagesTab with a dedicated dialog for user input.
- Updated message sending logic to default to the first available room if no contact is selected.
- Improved user feedback with SnackBars for connection issues and successful marker sends.
- Refactored contact selection to remove unused code and streamline the process.
- Added location fetching capabilities using Geolocator for SAR markers.
- Updated sample data with more relevant team names using emojis.
- Enhanced map markers to include rotation handling and improved display of contact information.
- Introduced color coding for location update age in map markers for better visibility.

lib/providers/messages_provider.dart

@@ -29,6 +29,9 @@ class MessagesProvider with ChangeNotifier {
   List<SarMarker> get stagingAreaMarkers =>
       sarMarkers.where((m) => m.type == SarMarkerType.stagingArea).toList();
 
+  List<SarMarker> get objectMarkers =>
+      sarMarkers.where((m) => m.type == SarMarkerType.object).toList();
+
   /// Add a message
   void addMessage(Message message) {
     _messages.add(message);
@@ -151,6 +154,7 @@ class MessagesProvider with ChangeNotifier {
       'foundPerson': foundPersonMarkers.length,
       'fire': fireMarkers.length,
       'stagingArea': stagingAreaMarkers.length,
+      'object': objectMarkers.length,
     };
   }
 }