fix: Resolve ANR during app initialization with 930+ peer identities

Move peer identity restoration to IO dispatcher to prevent blocking
main thread during JSON serialization. Also move interface status
polling to IO dispatcher to fix network status screen lag.

Changes:
- ColumbaApplication: Run restorePeerIdentities on Dispatchers.IO
- InterfaceManagementViewModel: Add injectable ioDispatcher for polling
- ConversationRepository: Remove per-identity logging (930 log calls)
- Update tests to inject test dispatcher for IO operations

🤖 Generated with [Claude Code](https://claude.com/claude-code)

Co-Authored-By: Claude Opus 4.5 <noreply@anthropic.com>

app/src/main/java/com/lxmf/messenger/ColumbaApplication.kt

@@ -349,7 +349,8 @@ class ColumbaApplication : Application() {
                             }
 
                             // Restore peer identities from database to enable message sending
-                            applicationScope.launch {
+                            // Run on IO dispatcher to avoid blocking main thread during JSON serialization
+                            applicationScope.launch(kotlinx.coroutines.Dispatchers.IO) {
                                 try {
                                     val peerIdentities = conversationRepository.getAllPeerIdentities()
                                     if (peerIdentities.isNotEmpty()) {

app/src/main/java/com/lxmf/messenger/viewmodel/InterfaceManagementViewModel.kt

@@ -119,6 +119,9 @@ class InterfaceManagementViewModel
 
             // Made internal var (not const) to allow disabling polling in tests
             internal var STATUS_POLL_INTERVAL_MS = 3000L
+
+            // Made internal var to allow injecting test dispatcher
+            internal var ioDispatcher: kotlinx.coroutines.CoroutineDispatcher = Dispatchers.IO
         }
 
         private val _state = MutableStateFlow(InterfaceManagementState())
@@ -158,7 +161,7 @@ class InterfaceManagementViewModel
                 Log.d(TAG, "Polling disabled (interval <= 0)")
                 return
             }
-            viewModelScope.launch {
+            viewModelScope.launch(ioDispatcher) {
                 while (true) {
                     try {
                         fetchInterfaceStatus()
@@ -184,7 +187,7 @@ class InterfaceManagementViewModel
                 return
             }
 
-            viewModelScope.launch {
+            viewModelScope.launch(ioDispatcher) {
                 serviceProtocol.interfaceStatusChanged.collect {
                     Log.d(TAG, "████ INTERFACE STATUS EVENT ████ Triggering immediate refresh")
                     try {

app/src/test/java/com/lxmf/messenger/viewmodel/InterfaceManagementViewModelStatusEventTest.kt

@@ -59,6 +59,9 @@ class InterfaceManagementViewModelStatusEventTest {
         // CRITICAL: Disable polling to prevent OOM in tests
         InterfaceManagementViewModel.STATUS_POLL_INTERVAL_MS = 0
 
+        // Use test dispatcher for IO operations
+        InterfaceManagementViewModel.ioDispatcher = testDispatcher
+
         interfaceRepository = mockk()
         configManager = mockk()
         bleStatusRepository = mockk()
@@ -97,6 +100,8 @@ class InterfaceManagementViewModelStatusEventTest {
             viewModel.viewModelScope.cancel()
         }
         Dispatchers.resetMain()
+        // Reset IO dispatcher to default
+        InterfaceManagementViewModel.ioDispatcher = Dispatchers.IO
         clearAllMocks()
         // Reset polling interval to default
         InterfaceManagementViewModel.STATUS_POLL_INTERVAL_MS = 3000L

data/src/main/java/com/lxmf/messenger/data/repository/ConversationRepository.kt

@@ -382,10 +382,6 @@ class ConversationRepository
 
             val identitiesWithKeys =
                 allPeerIdentities.map { peerIdentity ->
-                    android.util.Log.d(
-                        "ConversationRepository",
-                        "Peer ${peerIdentity.peerHash}: has public key, length=${peerIdentity.publicKey.size}",
-                    )
                     peerIdentity.peerHash to peerIdentity.publicKey
                 }