Refactor radio settings and localization updates

fixes #72

- Removed preset configurations for 915 MHz, 868 MHz, and 433 MHz from the RadioSettings model.
- Introduced a new list of regional preset configurations for various countries.
- Updated the settings screen to use a dropdown for selecting presets instead of chips.
- Added a switch for enabling client repeat functionality with appropriate warnings for frequency usage.
- Updated localization files for multiple languages to reflect changes in settings related to client repeat functionality.

lib/connector/meshcore_connector.dart

@@ -90,6 +90,8 @@ class MeshCoreConnector extends ChangeNotifier {
   int? _currentBwHz;
   int? _currentSf;
   int? _currentCr;
+  bool? _clientRepeat;
+  int? _firmwareVerCode;
   int? _batteryMillivolts;
   double? _selfLatitude;
   double? _selfLongitude;
@@ -200,6 +202,8 @@ class MeshCoreConnector extends ChangeNotifier {
   int? get currentBwHz => _currentBwHz;
   int? get currentSf => _currentSf;
   int? get currentCr => _currentCr;
+  bool? get clientRepeat => _clientRepeat;
+  int? get firmwareVerCode => _firmwareVerCode;
   Map<String, String>? get currentCustomVars => _currentCustomVars;
   int? get batteryMillivolts => _batteryMillivolts;
   int get maxContacts => _maxContacts;
@@ -916,6 +920,8 @@ class MeshCoreConnector extends ChangeNotifier {
     _selfName = null;
     _selfLatitude = null;
     _selfLongitude = null;
+    _clientRepeat = null;
+    _firmwareVerCode = null;
     _batteryMillivolts = null;
     _batteryRequested = false;
     _awaitingSelfInfo = false;
@@ -1820,6 +1826,13 @@ class MeshCoreConnector extends ChangeNotifier {
 
   void _handleDeviceInfo(Uint8List frame) {
     if (frame.length < 4) return;
+    _firmwareVerCode = frame[1];
+
+    // Parse client_repeat from firmware v9+ (byte 80)
+    if (frame.length >= 81) {
+      _clientRepeat = frame[80] != 0;
+    }
+
     // Firmware reports MAX_CONTACTS / 2 for v3+ device info.
     final reportedContacts = frame[2];
     final reportedChannels = frame[3];
@@ -1840,8 +1853,8 @@ class MeshCoreConnector extends ChangeNotifier {
           unawaited(getChannels(maxChannels: nextMaxChannels));
         }
       }
-      notifyListeners();
     }
+    notifyListeners();
   }
 
   void _handleNoMoreMessages() {

lib/connector/meshcore_protocol.dart

@@ -550,18 +550,24 @@ Uint8List buildSetChannelFrame(int channelIndex, String name, Uint8List psk) {
 }
 
 // Build CMD_SET_RADIO_PARAMS frame
-// Format: [cmd][freq x4][bw x4][sf][cr]
+// Format: [cmd][freq x4][bw x4][sf][cr] (pre-v9)
+//         [cmd][freq x4][bw x4][sf][cr][repeat] (firmware v9+)
 // freq: frequency in Hz (300000-2500000)
 // bw: bandwidth in Hz (7000-500000)
 // sf: spreading factor (5-12)
 // cr: coding rate (5-8)
-Uint8List buildSetRadioParamsFrame(int freqHz, int bwHz, int sf, int cr) {
+// clientRepeat: enable off-grid packet repeat (firmware v9+, omit for older)
+Uint8List buildSetRadioParamsFrame(int freqHz, int bwHz, int sf, int cr,
+    {bool? clientRepeat}) {
   final writer = BufferWriter();
   writer.writeByte(cmdSetRadioParams);
   writer.writeUInt32LE(freqHz);
   writer.writeUInt32LE(bwHz);
   writer.writeByte(sf);
   writer.writeByte(cr);
+  if (clientRepeat != null) {
+    writer.writeByte(clientRepeat ? 1 : 0);
+  }
   return writer.toBytes();
 }