Implement Noise XX Handshake Protocol for Direct Messages (#180)

* noise

* works?

* noise

* temporary

* better

* wip: use subnet

* better

* barely working

* werk

* subnet

* fix peer ID

* 8 byte peer ID

* wip noise

* wip fixes for noise

* std lib for noise

* noise handshake one step further

* buffers

* use fork

* fix imports

* simplify counter

* remove trash

* hashing

* no prologue

* nice

* wip, use noise encryption

* peer ID hex

* simplify session manager

* heavy logging

* use singleton

* Fix Noise session race condition with elegant per-peer actor serialization

- Use Kotlin coroutine actors for per-peer packet processing
- Each peer gets dedicated actor that processes packets sequentially
- Eliminates race conditions in session management without complex locking
- Single surgical change in PacketProcessor - minimal, maintainable
- Leverages Kotlin's native concurrency primitives

* decrypt correctly

* iniator works now

* clean code and fix signature to null

* better

* no signature in private message

* small fixes

* refactor ack

* refactor but untested

* messages working

* wip ack

* wip fix ack

* more logging

* pending tracker

* keep pending connections on errors

* less logging

* refactor model

* refactor frombinarydata

* idendityannouncement refactor and update to new binary protocol

* fix keys

* refix keys

* dms work

* revert to mainnet

* do not change bluetooth adapter name

* keep code but uncomment

* clean up comments

* cleanup comments

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

@@ -98,7 +98,17 @@ class BluetoothConnectionManager(
         
         try {
             isActive = true
-            
+
+        // set the adapter's name to our 8-character peerID for iOS privacy, TODO: Make this configurable
+        // try {
+        //     if (bluetoothAdapter?.name != myPeerID) {
+        //         bluetoothAdapter?.name = myPeerID
+        //         Log.d(TAG, "Set Bluetooth adapter name to peerID: $myPeerID for iOS compatibility.")
+        //     }
+        // } catch (se: SecurityException) {
+        //     Log.e(TAG, "Missing BLUETOOTH_CONNECT permission to set adapter name.", se)
+        // }
+
             // Start all component managers
             connectionScope.launch {
                 // Start connection tracker first
@@ -209,7 +219,7 @@ class BluetoothConnectionManager(
         Log.i(TAG, "Power mode changed to: $newMode")
         
         connectionScope.launch {
-            // CRITICAL FIX: Avoid rapid scan restarts by checking if we need to change scan behavior
+            // Avoid rapid scan restarts by checking if we need to change scan behavior
             val wasUsingDutyCycle = powerManager.shouldUseDutyCycle()
             
             // Update advertising with new power settings