Add active peer notification (#273)

* adding notification for active peers + tests

* adding a recently seen peer set to track if we've seen that peer before

* changing back to notificationManager naming

* fixing some weird formatting that occurred during merge conflict fix

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

@@ -1,13 +1,12 @@
 package com.bitchat.android.ui
 
-import androidx.lifecycle.LifecycleCoroutineScope
 import com.bitchat.android.mesh.BluetoothMeshDelegate
 import com.bitchat.android.mesh.BluetoothMeshService
 import com.bitchat.android.model.BitchatMessage
 import com.bitchat.android.model.DeliveryStatus
 import kotlinx.coroutines.CoroutineScope
 import kotlinx.coroutines.launch
-import java.util.*
+import java.util.Date
 
 /**
  * Handles all BluetoothMeshDelegate callbacks and routes them to appropriate managers
@@ -70,7 +69,7 @@ class MeshDelegateHandler(
             } else {
                 // Public message
                 messageManager.addMessage(message)
-                
+
                 // Check for mentions in mesh chat
                 checkAndTriggerMeshMentionNotification(message)
             }
@@ -86,9 +85,10 @@ class MeshDelegateHandler(
         coroutineScope.launch {
             state.setConnectedPeers(peers)
             state.setIsConnected(peers.isNotEmpty())
+            notificationManager.showActiveUserNotification(peers)
             // Flush router outbox for any peers that just connected (and their noiseHex aliases)
             runCatching { com.bitchat.android.services.MessageRouter.tryGetInstance()?.onPeersUpdated(peers) }
-            
+
             // Clean up channel members who disconnected
             channelManager.cleanupDisconnectedMembers(peers, getMyPeerID())
 
@@ -180,7 +180,7 @@ class MeshDelegateHandler(
     private fun unifyChatsIntoPeer(targetPeerID: String, keysToMerge: List<String>) {
         com.bitchat.android.services.ConversationAliasResolver.unifyChatsIntoPeer(state, targetPeerID, keysToMerge)
     }
-    
+
     override fun didReceiveChannelLeave(channel: String, fromPeer: String) {
         coroutineScope.launch {
             channelManager.removeChannelMember(channel, fromPeer)
@@ -219,13 +219,13 @@ class MeshDelegateHandler(
             if (currentNickname.isNullOrEmpty()) {
                 return
             }
-            
+
             // Check if this message mentions the current user using @username format
             val isMention = checkForMeshMention(message.content, currentNickname)
-            
+
             if (isMention) {
                 android.util.Log.d("MeshDelegateHandler", "🔔 Triggering mesh mention notification from ${message.sender}")
-                
+
                 notificationManager.showMeshMentionNotification(
                     senderNickname = message.sender,
                     messageContent = message.content,
@@ -236,14 +236,14 @@ class MeshDelegateHandler(
             android.util.Log.e("MeshDelegateHandler", "Error checking mesh mentions: ${e.message}")
         }
     }
-    
+
     /**
      * Check if the content mentions the current user with @username format (simple, no hash suffix)
      */
     private fun checkForMeshMention(content: String, currentNickname: String): Boolean {
         // Simple mention pattern for mesh: @username (no hash suffix like geohash)
         val mentionPattern = "@([\\p{L}0-9_]+)".toRegex()
-        
+
         return mentionPattern.findAll(content).any { match ->
             val mentionedUsername = match.groupValues[1]
             // Direct comparison for mesh mentions (no hash suffix to remove)