remove voice code make optimizations. Fix channels race conditions. add reply function

lib/utils/dialog_utils.dart

@@ -0,0 +1,34 @@
+import 'package:flutter/material.dart';
+import '../connector/meshcore_connector.dart';
+
+/// Shows a confirmation dialog before disconnecting from the device.
+/// Returns true if user confirmed and disconnect completed, false otherwise.
+Future<bool> showDisconnectDialog(
+  BuildContext context,
+  MeshCoreConnector connector,
+) async {
+  final confirmed = await showDialog<bool>(
+    context: context,
+    builder: (context) => AlertDialog(
+      title: const Text('Disconnect'),
+      content: const Text(
+          'Are you sure you want to disconnect from this device?'),
+      actions: [
+        TextButton(
+          onPressed: () => Navigator.pop(context, false),
+          child: const Text('Cancel'),
+        ),
+        TextButton(
+          onPressed: () => Navigator.pop(context, true),
+          child: const Text('Disconnect'),
+        ),
+      ],
+    ),
+  );
+
+  if (confirmed == true) {
+    await connector.disconnect();
+    return true;
+  }
+  return false;
+}

lib/utils/disconnect_navigation_mixin.dart

@@ -0,0 +1,20 @@
+import 'package:flutter/material.dart';
+import '../connector/meshcore_connector.dart';
+
+/// Mixin that automatically navigates back to scanner when disconnected.
+/// Use in State classes for screens that require active connection.
+mixin DisconnectNavigationMixin<T extends StatefulWidget> on State<T> {
+  /// Call this in your Widget build method to enable auto-navigation.
+  /// Returns true if still connected, false if navigation was triggered.
+  bool checkConnectionAndNavigate(MeshCoreConnector connector) {
+    if (!connector.isConnected) {
+      WidgetsBinding.instance.addPostFrameCallback((_) {
+        if (mounted) {
+          Navigator.popUntil(context, (route) => route.isFirst);
+        }
+      });
+      return false;
+    }
+    return true;
+  }
+}