Refactor SAR marker handling and add template management

- Updated CompassSarList and DetailedCompassDialog to use marker.displayName instead of marker.type.displayName.
- Enhanced DrawingLayer and DrawingMarkersLayer to support simple mode for drawing visibility and interaction.
- Added toggle switches in DrawingToolbar for showing/hiding received drawings and SAR markers.
- Modified MapMarkers to utilize custom emojis and display names for markers.
- Introduced RecipientSelectorSheet for selecting message recipients with search functionality.
- Refactored SarUpdateSheet to use SAR templates instead of marker types, allowing for emoji and name customization.
- Created SarTemplateEditDialog for adding and editing SAR templates with color selection and preview.

lib/main.dart

@@ -113,9 +113,11 @@ class _MeshCoreSarAppState extends State<MeshCoreSarApp> {
         ChangeNotifierProvider(create: (_) => ConnectionProvider()),
         ChangeNotifierProvider(
           create: (_) {
-            // Don't initialize here - it will be initialized in AppProvider.initialize()
-            // after connection is established and device info is available
-            return ContactsProvider();
+            // Initialize early to load persisted contacts for offline viewing
+            // Self-contact filtering will happen later when BLE connects
+            final provider = ContactsProvider();
+            provider.initializeEarly();
+            return provider;
           },
         ),
         ChangeNotifierProvider(