Add avatars display on map

lib/providers/contacts_provider.dart

@@ -423,9 +423,16 @@ class ContactsProvider with ChangeNotifier {
       debugPrint('  Old lastAdvert: ${contact.lastAdvert}');
       debugPrint('  New lastAdvert: $currentTimestamp');
 
+      final persistedGps = _getValidGpsOrNull(telemetry.gpsLocation);
       final updatedContact = contact.copyWith(
         telemetry: telemetry,
         lastAdvert: currentTimestamp, // Update last seen time
+        advLat: persistedGps != null
+            ? _coordinateToAdvertMicrodegrees(persistedGps.latitude)
+            : contact.advLat,
+        advLon: persistedGps != null
+            ? _coordinateToAdvertMicrodegrees(persistedGps.longitude)
+            : contact.advLon,
       );
       _contacts[contact.publicKeyHex] = updatedContact;
       debugPrint('  ✅ Updated contact in map (with new lastAdvert)');
@@ -476,6 +483,10 @@ class ContactsProvider with ChangeNotifier {
     return incomingGps == null;
   }
 
+  int _coordinateToAdvertMicrodegrees(double coordinate) {
+    return (coordinate * 1e6).round();
+  }
+
   /// Find contact by public key prefix (6 bytes)
   Contact? _findContactByPrefix(Uint8List prefix) {
     if (prefix.length < 6) return null;

lib/providers/helpers/ping_tracker.dart

@@ -46,8 +46,8 @@ class PingTracker {
   /// Mark a ping as successful (response received)
   /// Should be called when telemetry response arrives
   void markPingSuccessful(Uint8List publicKey) {
-    final String keyHex = _publicKeyToHex(publicKey);
-    final request = _pendingPings.remove(keyHex);
+    final requestKey = _findMatchingPendingPingKey(publicKey);
+    final request = requestKey != null ? _pendingPings.remove(requestKey) : null;
 
     if (request != null) {
       request.cancel();
@@ -81,6 +81,23 @@ class PingTracker {
   String _publicKeyToHex(Uint8List publicKey) {
     return publicKey.map((b) => b.toRadixString(16).padLeft(2, '0')).join('');
   }
+
+  String? _findMatchingPendingPingKey(Uint8List responseKey) {
+    final responseHex = _publicKeyToHex(responseKey);
+
+    if (_pendingPings.containsKey(responseHex)) {
+      return responseHex;
+    }
+
+    for (final entry in _pendingPings.entries) {
+      final pendingHex = entry.key;
+      if (pendingHex.startsWith(responseHex) || responseHex.startsWith(pendingHex)) {
+        return pendingHex;
+      }
+    }
+
+    return null;
+  }
 }
 
 /// Internal class to track a single ping request