Share GossipSyncManager across transports to prevent redundant message synchronization

- Registered BluetoothMeshService's GossipSyncManager as a singleton in MeshServiceHolder.
- Modified WifiAwareMeshService to use the shared GossipSyncManager if available.
- Added background cleanup for peer mappings on socket disconnection.
- Fixed Kotlin type mismatch during nickname map merging.

app/src/main/java/com/bitchat/android/mesh/BluetoothMeshService.kt

@@ -94,6 +94,9 @@ class BluetoothMeshService(private val context: Context) {
                 } catch (_: Exception) { 0.01 }
             }
         )
+        
+        // Register as shared instance for Wi-Fi Aware transport
+        com.bitchat.android.service.MeshServiceHolder.setGossipManager(gossipSyncManager)
 
         // Wire sync manager delegate
         gossipSyncManager.delegate = object : GossipSyncManager.Delegate {

app/src/main/java/com/bitchat/android/service/MeshServiceHolder.kt

@@ -9,6 +9,12 @@ import com.bitchat.android.mesh.BluetoothMeshService
  */
 object MeshServiceHolder {
     private const val TAG = "MeshServiceHolder"
+    @Volatile
+    var sharedGossipSyncManager: com.bitchat.android.sync.GossipSyncManager? = null
+        private set
+
+    fun setGossipManager(mgr: com.bitchat.android.sync.GossipSyncManager) { sharedGossipSyncManager = mgr }
+
     @Volatile
     var meshService: BluetoothMeshService? = null
         private set

app/src/main/java/com/bitchat/android/ui/ChatViewModel.kt

@@ -654,8 +654,8 @@ class ChatViewModel(
 
         // Merge nicknames from BLE and Wi‑Fi Aware to display names for all peers
         val bleNick = meshService.getPeerNicknames()
-        val awareNick = try { com.bitchat.android.wifiaware.WifiAwareController.getService()?.getPeerNicknamesMap() } catch (_: Exception) { null }
-        val mergedNick = if (awareNick != null) bleNick + awareNick.filterKeys { it !in bleNick || bleNick[it].isNullOrBlank() } else bleNick
+        val awareNickRaw = try { com.bitchat.android.wifiaware.WifiAwareController.getService()?.getPeerNicknamesMap() } catch (_: Exception) { null }
+        val mergedNick = if (awareNickRaw != null) bleNick + awareNickRaw.filter { it.value != null }.mapValues { it.value!! }.filterKeys { it !in bleNick || bleNick[it].isNullOrBlank() } else bleNick
         state.setPeerNicknames(mergedNick)
 
         val rssiValues = meshService.getPeerRSSI()

app/src/main/java/com/bitchat/android/wifi-aware/WifiAwareMeshService.kt

@@ -106,24 +106,30 @@ class WifiAwareMeshService(private val context: Context) {
         setupDelegates()
         messageHandler.packetProcessor = packetProcessor
 
-        gossipSyncManager = GossipSyncManager(
-            myPeerID = myPeerID,
-            scope = serviceScope,
-            configProvider = object : GossipSyncManager.ConfigProvider {
-                override fun seenCapacity(): Int = 500
-                override fun gcsMaxBytes(): Int = 400
-                override fun gcsTargetFpr(): Double = 0.01
-            }
-        )
-        gossipSyncManager.delegate = object : GossipSyncManager.Delegate {
-            override fun sendPacketToPeer(peerID: String, packet: BitchatPacket) {
-                this@WifiAwareMeshService.sendPacketToPeer(peerID, packet)
-            }
-            override fun sendPacket(packet: BitchatPacket) {
-                broadcastPacket(RoutedPacket(packet))
-            }
-            override fun signPacketForBroadcast(packet: BitchatPacket): BitchatPacket {
-                return signPacketBeforeBroadcast(packet)
+        // Use shared GossipSyncManager from MeshServiceHolder if available (minimal refactor)
+        val shared = com.bitchat.android.service.MeshServiceHolder.sharedGossipSyncManager
+        if (shared != null) {
+            gossipSyncManager = shared
+        } else {
+            gossipSyncManager = GossipSyncManager(
+                myPeerID = myPeerID,
+                scope = serviceScope,
+                configProvider = object : GossipSyncManager.ConfigProvider {
+                    override fun seenCapacity(): Int = 500
+                    override fun gcsMaxBytes(): Int = 400
+                    override fun gcsTargetFpr(): Double = 0.01
+                }
+            )
+            gossipSyncManager.delegate = object : GossipSyncManager.Delegate {
+                override fun sendPacketToPeer(peerID: String, packet: BitchatPacket) {
+                    this@WifiAwareMeshService.sendPacketToPeer(peerID, packet)
+                }
+                override fun sendPacket(packet: BitchatPacket) {
+                    broadcastPacket(RoutedPacket(packet))
+                }
+                override fun signPacketForBroadcast(packet: BitchatPacket): BitchatPacket {
+                    return signPacketBeforeBroadcast(packet)
+                }
             }
         }
     }
@@ -619,7 +625,7 @@ class WifiAwareMeshService(private val context: Context) {
             }
             override fun onLost(network: Network) {
                 networkCallbacks.remove(peerId)
-                Log.d(TAG, "SERVER: network lost for ${peerId.take(8)}…")
+                Log.d(TAG, "SERVER: network lost for \${peerId.take(8)}…")
             }
         }
 
@@ -826,15 +832,21 @@ class WifiAwareMeshService(private val context: Context) {
             }
 
             if (routedPeerId == null) {
+                routedPeerId = senderPeerHex
+                peerSockets[routedPeerId] = socket
+            }
+
             Log.d(TAG, "RX: packet type=${pkt.type} from ${senderPeerHex.take(8)}… (bytes=${raw.size})")
             packetProcessor.processPacket(RoutedPacket(pkt, routedPeerId))
         }
-        
-        // Loop break -> disconnection
+
         handlePeerDisconnection(initialLogicalPeerId, routedPeerId)
         socket.closeQuietly()
     }
 
+    /**
+     * Internal helper to ensure peer is cleaned up from all managers when a socket dies.
+     */
     private fun handlePeerDisconnection(initialId: String, routedId: String?) {
         serviceScope.launch {
             Log.w(TAG, "Cleaning up peer: $initialId / $routedId")