Add thread-safety and BLE support for Ledger and Trezor devices (#3638)

* feat: support BLE device detection for Ledger and Trezor wallets, update trezor-flutter dependency

* feat: add BLE connection state listener for Trezor devices, handle disconnect events, and clean up resources on close

* feat: add mutex locking to MoneroTrezorService for thread-safe operations

lib/src/screens/connect_device/connect_device_page.dart

@@ -108,6 +108,8 @@ class ConnectDevicePageBodyState extends State<ConnectDevicePageBody> {
   void initState() {
     super.initState();
     WidgetsBinding.instance.addPostFrameCallback((_) {
+      _loadConnectedDevices();
+
       _bleStateTimer = Timer.periodic(
         const Duration(seconds: 1),
         (_) => widget.hardwareWalletVM.updateBleState(),
@@ -131,6 +133,23 @@ class ConnectDevicePageBodyState extends State<ConnectDevicePageBody> {
     });
   }
 
+  Future<void> _loadConnectedDevices() async {
+    try {
+      final connected = await widget.hardwareWalletVM.getConnectedBleDevices();
+      
+      printV(connected);
+      if (!mounted || connected.isEmpty) {
+        return;
+      }
+      setState(() {
+        bleDevices.addAll(connected);
+        longWait = false;
+      });
+    } catch (e) {
+      printV(e);
+    }
+  }
+
   @override
   void dispose() {
     _bleRefreshTimer?.cancel();

lib/view_model/hardware_wallet/hardware_wallet_view_model.dart

@@ -18,6 +18,8 @@ abstract class HardwareWalletViewModel {
 
   Future<List<HardwareWalletDevice>> getAllUsbDevices();
 
+  Future<List<HardwareWalletDevice>> getConnectedBleDevices() async => [];
+
   Future<void> stopScanning();
 
   Future<bool> connectDevice(HardwareWalletDevice device, WalletType type);

lib/view_model/hardware_wallet/ledger_view_model.dart

@@ -120,6 +120,14 @@ abstract class LedgerViewModelBase extends HardwareWalletViewModel with Store {
   Future<List<HardwareWalletDevice>> getAllUsbDevices() =>
       ledgerPlusUSB.devices.then((devices) => devices.map(LedgerHardwareWalletDevice.new).toList());
 
+  @override
+  Future<List<HardwareWalletDevice>> getConnectedBleDevices() async {
+    if (!_bleIsInitialized) {
+      return const [];
+    }
+    return (await ledgerPlusBLE.devices).map(LedgerHardwareWalletDevice.new).toList();
+  }
+
   @override
   Future<void> stopScanning() async {
     if (_bleIsInitialized) {

lib/view_model/hardware_wallet/trezor_connect_view_model.dart

@@ -48,6 +48,7 @@ abstract class TrezorConnectViewModelBase extends HardwareWalletViewModel with S
     }
   }
 
+  StreamSubscription<sdk.BleConnectionState>? _connectionChangeSubscription;
   final connect_sdk.TrezorConnect trezorConnect;
   final SecureStorage _secureStorage;
 
@@ -125,6 +126,14 @@ abstract class TrezorConnectViewModelBase extends HardwareWalletViewModel with S
   Future<List<HardwareWalletDevice>> getAllUsbDevices() =>
       trezorUSB.devices.then((devices) => devices.map(TrezorHardwareWalletDevice.new).toList());
 
+  @override
+  Future<List<HardwareWalletDevice>> getConnectedBleDevices() async {
+    if (!_bleIsInitialized) {
+      return const [];
+    }
+    return (await trezorBLE.devices).map(TrezorHardwareWalletDevice.new).toList();
+  }
+
   @override
   Future<void> stopScanning() async {
     if (_bleIsInitialized) {
@@ -168,6 +177,9 @@ abstract class TrezorConnectViewModelBase extends HardwareWalletViewModel with S
           device.connectionType == HardwareWalletConnectionType.ble ? trezorBLE : trezorUSB;
       final connection = await trezorInterface.connect(device.device);
 
+      _connectionChangeSubscription ??=
+          trezorInterface.deviceStateChanges.listen(_connectionChangeListener);
+
       if (!isRetry) {
         unawaited(
           showModalBottomSheet(
@@ -342,6 +354,13 @@ abstract class TrezorConnectViewModelBase extends HardwareWalletViewModel with S
     }
   }
 
+  void _connectionChangeListener(sdk.BleConnectionState event) {
+    printV("Ledger Device State Changed: $event");
+    if (event == sdk.BleConnectionState.disconnected && !isConnecting) {
+      _client = null;
+    }
+  }
+
   Future<bool> syncKeyImages(WalletBase wallet) async {
     if (wallet.type == WalletType.monero) {
       try {
@@ -352,6 +371,17 @@ abstract class TrezorConnectViewModelBase extends HardwareWalletViewModel with S
     }
     return true;
   }
+
+  @override
+  Future<void> close() async {
+    try {
+      await _connectionChangeSubscription?.cancel();
+
+      _connectionChangeSubscription = null;
+      isConnecting = false;
+      await stopScanning();
+    } catch (_) {}
+  }
 }
 
 abstract class TrezorParingState {