refactor(tcp): promote MeshCoreTcpConnector, fix translations, harden UI

- Replace thin MeshCoreTcpManager facade with a proper MeshCoreTcpConnector
  that owns TcpTransportService and the frame subscription, mirroring
  MeshCoreUsbManager. The connector no longer holds a raw TcpTransportService
  or a _tcpFrameSubscription field.
- Remove hardcoded default host IP from TcpScreen (keep port 5000 hint).
- Disable connect button during scanning state, not just connecting state.
- Fix tcpPortLabel mistranslated as nautical "port/harbor" in de, it, pt,
  nl, sv, sk, sl, zh; fix corrupted Slovak tcpPortHint ("5 000" → "5000").
- Remove unused tcpStatus_connecting string from all 15 locale arb files
  and all generated app_localizations_*.dart files.
- Add extendedPadding to TCP screen FABs to match USB screen.
- Add Key to connect button; update tests to use byKey and assert
  onPressed == null when button is disabled during scanning.

lib/connector/meshcore_connector.dart

@@ -116,8 +116,7 @@ class MeshCoreConnector extends ChangeNotifier {
   bool _manualDisconnect = false;
   final MeshCoreUsbManager _usbManager = MeshCoreUsbManager();
   StreamSubscription<Uint8List>? _usbFrameSubscription;
-  final MeshCoreTcpManager _tcpManager = MeshCoreTcpManager();
-  StreamSubscription<Uint8List>? _tcpFrameSubscription;
+  final MeshCoreTcpConnector _tcpConnector = MeshCoreTcpConnector();
   MeshCoreTransportType _activeTransport = MeshCoreTransportType.bluetooth;
 
   final List<ScanResult> _scanResults = [];
@@ -257,7 +256,7 @@ class MeshCoreConnector extends ChangeNotifier {
   bool get isUsbTransportConnected =>
       _state == MeshCoreConnectionState.connected &&
       _activeTransport == MeshCoreTransportType.usb;
-  String? get activeTcpEndpoint => _tcpManager.activeEndpoint;
+  String? get activeTcpEndpoint => _tcpConnector.activeEndpoint;
   bool get isTcpTransportConnected =>
       _state == MeshCoreConnectionState.connected &&
       _activeTransport == MeshCoreTransportType.tcp;
@@ -666,7 +665,7 @@ class MeshCoreConnector extends ChangeNotifier {
     _appDebugLogService = appDebugLogService;
     _backgroundService = backgroundService;
     _usbManager.setDebugLogService(_appDebugLogService);
-    _tcpManager.setDebugLogService(_appDebugLogService);
+    _tcpConnector.setDebugLogService(_appDebugLogService);
 
     // Initialize notification service
     _notificationService.initialize();
@@ -1002,22 +1001,21 @@ class MeshCoreConnector extends ChangeNotifier {
           await disconnect(manual: false);
           return;
         }
-        if (_tcpManager.isConnected) {
-          await _tcpManager.disconnect();
+        if (_tcpConnector.isConnected) {
+          await _tcpConnector.disconnect();
         }
       }
 
-      await _tcpFrameSubscription?.cancel();
-      _tcpFrameSubscription = null;
-      await _tcpManager.connect(host: host, port: port);
+      await _tcpConnector.cancelFrameSubscription();
+      await _tcpConnector.connect(host: host, port: port);
       final isTcpConnectCancelled =
           _activeTransport != MeshCoreTransportType.tcp ||
           _state != MeshCoreConnectionState.connecting ||
-          !_tcpManager.isConnected;
+          !_tcpConnector.isConnected;
       if (isTcpConnectCancelled) {
         await handleTcpConnectAbort(
           message:
-              'connectTcp aborted before handshake: state=$_state transport=$_activeTransport connected=${_tcpManager.isConnected}',
+              'connectTcp aborted before handshake: state=$_state transport=$_activeTransport connected=${_tcpConnector.isConnected}',
         );
         return;
       }
@@ -1027,16 +1025,16 @@ class MeshCoreConnector extends ChangeNotifier {
       final isTcpConnectCancelledAfterDelay =
           _activeTransport != MeshCoreTransportType.tcp ||
           _state != MeshCoreConnectionState.connecting ||
-          !_tcpManager.isConnected;
+          !_tcpConnector.isConnected;
       if (isTcpConnectCancelledAfterDelay) {
         await handleTcpConnectAbort(
           message:
-              'connectTcp aborted after connect delay: state=$_state transport=$_activeTransport connected=${_tcpManager.isConnected}',
+              'connectTcp aborted after connect delay: state=$_state transport=$_activeTransport connected=${_tcpConnector.isConnected}',
         );
         return;
       }
-      _tcpFrameSubscription = _tcpManager.frameStream.listen(
-        _handleFrame,
+      _tcpConnector.listenFrames(
+        onFrame: _handleFrame,
         onError: (error, stackTrace) {
           _appDebugLogService?.error('TCP transport error: $error', tag: 'TCP');
           unawaited(disconnect(manual: false));
@@ -1073,7 +1071,7 @@ class MeshCoreConnector extends ChangeNotifier {
             manualDisconnect: _manualDisconnect,
             state: _state,
             activeTransport: _activeTransport,
-            tcpManagerConnected: _tcpManager.isConnected,
+            tcpManagerConnected: _tcpConnector.isConnected,
           );
       if (tcpConnectCancelledBeforeHandshake) {
         _appDebugLogService?.info(
@@ -1445,9 +1443,7 @@ class MeshCoreConnector extends ChangeNotifier {
     await _usbFrameSubscription?.cancel();
     _usbFrameSubscription = null;
     await _usbManager.disconnect();
-    await _tcpFrameSubscription?.cancel();
-    _tcpFrameSubscription = null;
-    await _tcpManager.disconnect();
+    await _tcpConnector.disconnect();
 
     await _notifySubscription?.cancel();
     _notifySubscription = null;
@@ -1530,7 +1526,7 @@ class MeshCoreConnector extends ChangeNotifier {
     if (_activeTransport == MeshCoreTransportType.usb) {
       await _usbManager.write(data);
     } else if (_activeTransport == MeshCoreTransportType.tcp) {
-      await _tcpManager.write(data);
+      await _tcpConnector.write(data);
     } else {
       if (_rxCharacteristic == null) {
         throw Exception("MeshCore RX characteristic not available");
@@ -4484,14 +4480,13 @@ class MeshCoreConnector extends ChangeNotifier {
     _scanSubscription?.cancel();
     _connectionSubscription?.cancel();
     _usbFrameSubscription?.cancel();
-    _tcpFrameSubscription?.cancel();
     _notifySubscription?.cancel();
     _notifyListenersTimer?.cancel();
     _reconnectTimer?.cancel();
     _batteryPollTimer?.cancel();
     _receivedFramesController.close();
     _usbManager.dispose();
-    _tcpManager.dispose();
+    _tcpConnector.dispose();
 
     // Flush pending unread writes before disposal
     _unreadStore.flush();

lib/connector/meshcore_connector_tcp.dart

@@ -1,34 +1,70 @@
+import 'dart:async';
 import 'dart:typed_data';
 
 import '../services/app_debug_log_service.dart';
 import '../services/tcp_transport_service.dart';
 
-class MeshCoreTcpManager {
+/// Manages TCP transport for MeshCore devices.
+///
+/// Owns the [TcpTransportService] and TCP-specific connection state.
+/// The main [MeshCoreConnector] delegates all TCP operations here.
+class MeshCoreTcpConnector {
   final TcpTransportService _service = TcpTransportService();
   AppDebugLogService? _debugLog;
+  StreamSubscription<Uint8List>? _frameSubscription;
 
+  // --- Getters ---
   String? get activeEndpoint => _service.activeEndpoint;
   bool get isConnected => _service.isConnected;
-  Stream<Uint8List> get frameStream => _service.frameStream;
 
+  // --- Configuration ---
   void setDebugLogService(AppDebugLogService? service) {
     _debugLog = service;
     _service.setDebugLogService(service);
   }
 
+  // --- Connection lifecycle ---
   Future<void> connect({required String host, required int port}) async {
-    _debugLog?.info('TcpManager.connect endpoint=$host:$port', tag: 'TCP');
+    _debugLog?.info('TcpConnector.connect endpoint=$host:$port', tag: 'TCP');
+    await _frameSubscription?.cancel();
+    _frameSubscription = null;
     await _service.connect(host: host, port: port);
+    _debugLog?.info(
+      'TcpConnector.connect done, endpoint=${_service.activeEndpoint}',
+      tag: 'TCP',
+    );
+  }
+
+  StreamSubscription<Uint8List> listenFrames({
+    required void Function(Uint8List) onFrame,
+    required void Function(Object, StackTrace?) onError,
+    required void Function() onDone,
+  }) {
+    _frameSubscription = _service.frameStream.listen(
+      onFrame,
+      onError: onError,
+      onDone: onDone,
+    );
+    return _frameSubscription!;
+  }
+
+  Future<void> cancelFrameSubscription() async {
+    await _frameSubscription?.cancel();
+    _frameSubscription = null;
   }
 
   Future<void> disconnect() async {
-    _debugLog?.info('TcpManager.disconnect', tag: 'TCP');
+    if (!_service.isConnected && _frameSubscription == null) return;
+    _debugLog?.info('TcpConnector.disconnect', tag: 'TCP');
+    await _frameSubscription?.cancel();
+    _frameSubscription = null;
     await _service.disconnect();
   }
 
   Future<void> write(Uint8List data) => _service.write(data);
 
   void dispose() {
+    _frameSubscription?.cancel();
     _service.dispose();
   }
 }

lib/l10n/app_bg.arb

@@ -1881,7 +1881,6 @@
   "tcpPortLabel": "Пристанище",
   "tcpPortHint": "5000",
   "tcpStatus_notConnected": "Въведете крайната точка и свържете се.",
-  "tcpStatus_connecting": "Свързване към TCP крайния пункт...",
   "tcpStatus_connectingTo": "Свързване към {endpoint}...",
   "tcpErrorHostRequired": "Необходим е IP адрес.",
   "tcpErrorPortInvalid": "Портът трябва да бъде между 1 и 65535.",

lib/l10n/app_de.arb

@@ -1906,10 +1906,9 @@
   "connectionChoiceTcpLabel": "TCP",
   "tcpHostHint": "192.168.40.10",
   "tcpScreenTitle": "Verbinden über TCP",
-  "tcpPortLabel": "Hafen",
+  "tcpPortLabel": "Port",
   "tcpPortHint": "5000",
   "tcpStatus_notConnected": "Geben Sie den Endpunkt ein und verbinden Sie sich.",
-  "tcpStatus_connecting": "Verbindung zum TCP-Endpunkt hergestellt...",
   "tcpStatus_connectingTo": "Verbindung zu {endpoint}...",
   "tcpErrorHostRequired": "Eine IP-Adresse ist erforderlich.",
   "tcpErrorPortInvalid": "Die Portnummer muss zwischen 1 und 65535 liegen.",

lib/l10n/app_en.arb

@@ -56,7 +56,6 @@
   "tcpPortLabel": "Port",
   "tcpPortHint": "5000",
   "tcpStatus_notConnected": "Enter endpoint and connect",
-  "tcpStatus_connecting": "Connecting to TCP endpoint...",
   "tcpStatus_connectingTo": "Connecting to {endpoint}...",
   "@tcpStatus_connectingTo": {
     "placeholders": {

lib/l10n/app_es.arb

@@ -1909,7 +1909,6 @@
   "tcpPortLabel": "Puerto",
   "tcpPortHint": "5000",
   "tcpStatus_notConnected": "Ingrese la dirección final y conecte.",
-  "tcpStatus_connecting": "Conectándose al punto final TCP...",
   "tcpStatus_connectingTo": "Conectándose a {endpoint}...",
   "tcpErrorHostRequired": "Se requiere la dirección IP.",
   "tcpErrorPortInvalid": "El puerto debe estar entre 1 y 65535.",

lib/l10n/app_fr.arb

@@ -1881,7 +1881,6 @@
   "tcpPortLabel": "Port",
   "tcpPortHint": "5000",
   "tcpStatus_notConnected": "Entrez l'adresse de destination et connectez-vous.",
-  "tcpStatus_connecting": "Connexion au point de terminaison TCP...",
   "tcpStatus_connectingTo": "Connexion à {endpoint}...",
   "tcpErrorHostRequired": "Une adresse IP est obligatoire.",
   "tcpErrorPortInvalid": "La taille du port doit être comprise entre 1 et 65535.",

lib/l10n/app_it.arb

@@ -1878,10 +1878,9 @@
   "tcpHostHint": "192.168.40.10",
   "connectionChoiceTcpLabel": "TCP",
   "tcpScreenTitle": "Stabilire una connessione tramite TCP",
-  "tcpPortLabel": "Porto",
+  "tcpPortLabel": "Porta",
   "tcpPortHint": "5000",
   "tcpStatus_notConnected": "Inserisci l'endpoint e connettiti.",
-  "tcpStatus_connecting": "Connessione al punto finale TCP...",
   "tcpStatus_connectingTo": "Connessione a {endpoint}...",
   "tcpErrorHostRequired": "È necessario fornire un indirizzo IP.",
   "tcpErrorPortInvalid": "La dimensione della porta deve essere compresa tra 1 e 65535.",

lib/l10n/app_localizations.dart

@@ -376,12 +376,6 @@ abstract class AppLocalizations {
   /// **'Enter endpoint and connect'**
   String get tcpStatus_notConnected;
 
-  /// No description provided for @tcpStatus_connecting.
-  ///
-  /// In en, this message translates to:
-  /// **'Connecting to TCP endpoint...'**
-  String get tcpStatus_connecting;
-
   /// No description provided for @tcpStatus_connectingTo.
   ///
   /// In en, this message translates to:

lib/l10n/app_localizations_bg.dart

@@ -138,9 +138,6 @@ class AppLocalizationsBg extends AppLocalizations {
   @override
   String get tcpStatus_notConnected => 'Въведете крайната точка и свържете се.';
 
-  @override
-  String get tcpStatus_connecting => 'Свързване към TCP крайния пункт...';
-
   @override
   String tcpStatus_connectingTo(String endpoint) {
     return 'Свързване към $endpoint...';

lib/l10n/app_localizations_de.dart

@@ -130,7 +130,7 @@ class AppLocalizationsDe extends AppLocalizations {
   String get tcpHostHint => '192.168.40.10';
 
   @override
-  String get tcpPortLabel => 'Hafen';
+  String get tcpPortLabel => 'Port';
 
   @override
   String get tcpPortHint => '5000';
@@ -139,10 +139,6 @@ class AppLocalizationsDe extends AppLocalizations {
   String get tcpStatus_notConnected =>
       'Geben Sie den Endpunkt ein und verbinden Sie sich.';
 
-  @override
-  String get tcpStatus_connecting =>
-      'Verbindung zum TCP-Endpunkt hergestellt...';
-
   @override
   String tcpStatus_connectingTo(String endpoint) {
     return 'Verbindung zu $endpoint...';

lib/l10n/app_localizations_en.dart

@@ -138,9 +138,6 @@ class AppLocalizationsEn extends AppLocalizations {
   @override
   String get tcpStatus_notConnected => 'Enter endpoint and connect';
 
-  @override
-  String get tcpStatus_connecting => 'Connecting to TCP endpoint...';
-
   @override
   String tcpStatus_connectingTo(String endpoint) {
     return 'Connecting to $endpoint...';

lib/l10n/app_localizations_es.dart

@@ -138,9 +138,6 @@ class AppLocalizationsEs extends AppLocalizations {
   @override
   String get tcpStatus_notConnected => 'Ingrese la dirección final y conecte.';
 
-  @override
-  String get tcpStatus_connecting => 'Conectándose al punto final TCP...';
-
   @override
   String tcpStatus_connectingTo(String endpoint) {
     return 'Conectándose a $endpoint...';

lib/l10n/app_localizations_fr.dart

@@ -139,9 +139,6 @@ class AppLocalizationsFr extends AppLocalizations {
   String get tcpStatus_notConnected =>
       'Entrez l\'adresse de destination et connectez-vous.';
 
-  @override
-  String get tcpStatus_connecting => 'Connexion au point de terminaison TCP...';
-
   @override
   String tcpStatus_connectingTo(String endpoint) {
     return 'Connexion à $endpoint...';

lib/l10n/app_localizations_it.dart

@@ -130,7 +130,7 @@ class AppLocalizationsIt extends AppLocalizations {
   String get tcpHostHint => '192.168.40.10';
 
   @override
-  String get tcpPortLabel => 'Porto';
+  String get tcpPortLabel => 'Porta';
 
   @override
   String get tcpPortHint => '5000';
@@ -138,9 +138,6 @@ class AppLocalizationsIt extends AppLocalizations {
   @override
   String get tcpStatus_notConnected => 'Inserisci l\'endpoint e connettiti.';
 
-  @override
-  String get tcpStatus_connecting => 'Connessione al punto finale TCP...';
-
   @override
   String tcpStatus_connectingTo(String endpoint) {
     return 'Connessione a $endpoint...';

lib/l10n/app_localizations_nl.dart

@@ -130,7 +130,7 @@ class AppLocalizationsNl extends AppLocalizations {
   String get tcpHostHint => '192.168.40.10';
 
   @override
-  String get tcpPortLabel => 'Haven';
+  String get tcpPortLabel => 'Poort';
 
   @override
   String get tcpPortHint => '5000';
@@ -138,9 +138,6 @@ class AppLocalizationsNl extends AppLocalizations {
   @override
   String get tcpStatus_notConnected => 'Voer het eindpunt in en verbind';
 
-  @override
-  String get tcpStatus_connecting => 'Verbinding maken met TCP-eindpunt...';
-
   @override
   String tcpStatus_connectingTo(String endpoint) {
     return 'Verbinding maken met $endpoint...';

lib/l10n/app_localizations_pl.dart

@@ -138,9 +138,6 @@ class AppLocalizationsPl extends AppLocalizations {
   @override
   String get tcpStatus_notConnected => 'Wprowadź adres URL i połącz';
 
-  @override
-  String get tcpStatus_connecting => 'Połączenie z punktem TCP...';
-
   @override
   String tcpStatus_connectingTo(String endpoint) {
     return 'Połączenie z $endpoint...';

lib/l10n/app_localizations_pt.dart

@@ -130,7 +130,7 @@ class AppLocalizationsPt extends AppLocalizations {
   String get tcpHostHint => '192.168.40.10';
 
   @override
-  String get tcpPortLabel => 'Porto';
+  String get tcpPortLabel => 'Porta';
 
   @override
   String get tcpPortHint => '5000';
@@ -138,10 +138,6 @@ class AppLocalizationsPt extends AppLocalizations {
   @override
   String get tcpStatus_notConnected => 'Insira o endereço final e conecte-se.';
 
-  @override
-  String get tcpStatus_connecting =>
-      'Conectando ao ponto de extremidade TCP...';
-
   @override
   String tcpStatus_connectingTo(String endpoint) {
     return 'Conectando a $endpoint...';

lib/l10n/app_localizations_ru.dart

@@ -138,9 +138,6 @@ class AppLocalizationsRu extends AppLocalizations {
   @override
   String get tcpStatus_notConnected => 'Введите адрес и подключитесь.';
 
-  @override
-  String get tcpStatus_connecting => 'Установление соединения с TCP-портом...';
-
   @override
   String tcpStatus_connectingTo(String endpoint) {
     return 'Подключение к $endpoint...';

lib/l10n/app_localizations_sk.dart

@@ -130,17 +130,14 @@ class AppLocalizationsSk extends AppLocalizations {
   String get tcpHostHint => '192.168.40.10';
 
   @override
-  String get tcpPortLabel => 'Pri항';
+  String get tcpPortLabel => 'Port';
 
   @override
-  String get tcpPortHint => '5 000';
+  String get tcpPortHint => '5000';
 
   @override
   String get tcpStatus_notConnected => 'Zadajte cieľovú adresu a pripojte sa.';
 
-  @override
-  String get tcpStatus_connecting => 'Pripojenie k TCP endpointu...';
-
   @override
   String tcpStatus_connectingTo(String endpoint) {
     return 'Pripojenie k $endpoint...';

lib/l10n/app_localizations_sl.dart

@@ -130,7 +130,7 @@ class AppLocalizationsSl extends AppLocalizations {
   String get tcpHostHint => '192.168.40.10';
 
   @override
-  String get tcpPortLabel => 'Pril';
+  String get tcpPortLabel => 'Vrata';
 
   @override
   String get tcpPortHint => '5000';
@@ -138,9 +138,6 @@ class AppLocalizationsSl extends AppLocalizations {
   @override
   String get tcpStatus_notConnected => 'Vnesite končni naslov in se povežite';
 
-  @override
-  String get tcpStatus_connecting => 'Povezava z TCP koncem...';
-
   @override
   String tcpStatus_connectingTo(String endpoint) {
     return 'Povezava z $endpoint...';

lib/l10n/app_localizations_sv.dart

@@ -130,7 +130,7 @@ class AppLocalizationsSv extends AppLocalizations {
   String get tcpHostHint => '192.168.40.10';
 
   @override
-  String get tcpPortLabel => 'Hamn';
+  String get tcpPortLabel => 'Port';
 
   @override
   String get tcpPortHint => '5000';
@@ -138,9 +138,6 @@ class AppLocalizationsSv extends AppLocalizations {
   @override
   String get tcpStatus_notConnected => 'Ange slutpunkt och anslut';
 
-  @override
-  String get tcpStatus_connecting => 'Anslutning till TCP-slutpunkt...';
-
   @override
   String tcpStatus_connectingTo(String endpoint) {
     return 'Anslutning till $endpoint...';

lib/l10n/app_localizations_uk.dart

@@ -138,9 +138,6 @@ class AppLocalizationsUk extends AppLocalizations {
   @override
   String get tcpStatus_notConnected => 'Введіть кінцеву точку та підключіться';
 
-  @override
-  String get tcpStatus_connecting => 'Підключення до TCP-кінцевої точки...';
-
   @override
   String tcpStatus_connectingTo(String endpoint) {
     return 'Підключення до $endpoint...';

lib/l10n/app_localizations_zh.dart

@@ -130,7 +130,7 @@ class AppLocalizationsZh extends AppLocalizations {
   String get tcpHostHint => '192.168.40.10';
 
   @override
-  String get tcpPortLabel => '港';
+  String get tcpPortLabel => '端口';
 
   @override
   String get tcpPortHint => '5000';
@@ -138,9 +138,6 @@ class AppLocalizationsZh extends AppLocalizations {
   @override
   String get tcpStatus_notConnected => '输入目标地址，然后连接';
 
-  @override
-  String get tcpStatus_connecting => '连接到 TCP 终点...';
-
   @override
   String tcpStatus_connectingTo(String endpoint) {
     return '连接到 $endpoint...';

lib/l10n/app_nl.arb

@@ -1878,10 +1878,9 @@
   "tcpHostLabel": "IP-adres",
   "tcpHostHint": "192.168.40.10",
   "connectionChoiceTcpLabel": "TCP",
-  "tcpPortLabel": "Haven",
+  "tcpPortLabel": "Poort",
   "tcpPortHint": "5000",
   "tcpStatus_notConnected": "Voer het eindpunt in en verbind",
-  "tcpStatus_connecting": "Verbinding maken met TCP-eindpunt...",
   "tcpStatus_connectingTo": "Verbinding maken met {endpoint}...",
   "tcpErrorHostRequired": "Een IP-adres is vereist.",
   "tcpErrorPortInvalid": "De poortwaarde moet tussen 1 en 65535 liggen.",

lib/l10n/app_pl.arb

@@ -1881,7 +1881,6 @@
   "tcpPortLabel": "Port",
   "tcpPortHint": "5000",
   "tcpStatus_notConnected": "Wprowadź adres URL i połącz",
-  "tcpStatus_connecting": "Połączenie z punktem TCP...",
   "tcpStatus_connectingTo": "Połączenie z {endpoint}...",
   "tcpErrorHostRequired": "Wymagana jest adresa IP.",
   "tcpErrorPortInvalid": "Numer portu musi mieścić się w zakresie od 1 do 65535.",

lib/l10n/app_pt.arb

@@ -1878,10 +1878,9 @@
   "connectionChoiceTcpLabel": "TCP",
   "tcpScreenTitle": "Estabelecer conexão via TCP",
   "tcpHostHint": "192.168.40.10",
-  "tcpPortLabel": "Porto",
+  "tcpPortLabel": "Porta",
   "tcpPortHint": "5000",
   "tcpStatus_notConnected": "Insira o endereço final e conecte-se.",
-  "tcpStatus_connecting": "Conectando ao ponto de extremidade TCP...",
   "tcpStatus_connectingTo": "Conectando a {endpoint}...",
   "tcpErrorHostRequired": "É necessário fornecer um endereço IP.",
   "tcpErrorPortInvalid": "O valor do porto deve estar entre 1 e 65535.",

lib/l10n/app_ru.arb

@@ -1121,7 +1121,6 @@
   "tcpPortLabel": "Порт",
   "tcpPortHint": "5000",
   "tcpStatus_notConnected": "Введите адрес и подключитесь.",
-  "tcpStatus_connecting": "Установление соединения с TCP-портом...",
   "tcpStatus_connectingTo": "Подключение к {endpoint}...",
   "tcpErrorHostRequired": "Необходимо указать IP-адрес.",
   "tcpErrorPortInvalid": "Порт должен находиться в диапазоне от 1 до 65535.",

lib/l10n/app_sk.arb

@@ -1878,10 +1878,9 @@
   "tcpHostLabel": "IP adresa",
   "tcpScreenTitle": "Spojte sa pomocou protokolu TCP",
   "connectionChoiceTcpLabel": "TCP",
-  "tcpPortLabel": "Pri항",
-  "tcpPortHint": "5 000",
+  "tcpPortLabel": "Port",
+  "tcpPortHint": "5000",
   "tcpStatus_notConnected": "Zadajte cieľovú adresu a pripojte sa.",
-  "tcpStatus_connecting": "Pripojenie k TCP endpointu...",
   "tcpStatus_connectingTo": "Pripojenie k {endpoint}...",
   "tcpErrorHostRequired": "Je potrebné zadať IP adresu.",
   "tcpErrorPortInvalid": "Číslo portu musí byť medzi 1 a 65535.",

lib/l10n/app_sl.arb

@@ -1878,10 +1878,9 @@
   "tcpHostLabel": "IP naslov",
   "tcpHostHint": "192.168.40.10",
   "tcpScreenTitle": "Komunicirajte preko protokola TCP",
-  "tcpPortLabel": "Pril",
+  "tcpPortLabel": "Vrata",
   "tcpPortHint": "5000",
   "tcpStatus_notConnected": "Vnesite končni naslov in se povežite",
-  "tcpStatus_connecting": "Povezava z TCP koncem...",
   "tcpStatus_connectingTo": "Povezava z {endpoint}...",
   "tcpErrorHostRequired": "Potrebna je IP-naslov.",
   "tcpErrorPortInvalid": "Port mora biti med 1 in 65535.",

lib/l10n/app_sv.arb

@@ -1878,10 +1878,9 @@
   "tcpHostLabel": "IP-adress",
   "tcpScreenTitle": "Anslut via TCP",
   "connectionChoiceTcpLabel": "TCP",
-  "tcpPortLabel": "Hamn",
+  "tcpPortLabel": "Port",
   "tcpPortHint": "5000",
   "tcpStatus_notConnected": "Ange slutpunkt och anslut",
-  "tcpStatus_connecting": "Anslutning till TCP-slutpunkt...",
   "tcpStatus_connectingTo": "Anslutning till {endpoint}...",
   "tcpErrorHostRequired": "IP-adress krävs.",
   "tcpErrorPortInvalid": "Porten måste vara mellan 1 och 65535.",

lib/l10n/app_uk.arb

@@ -1881,7 +1881,6 @@
   "tcpPortLabel": "Порт",
   "tcpPortHint": "5000",
   "tcpStatus_notConnected": "Введіть кінцеву точку та підключіться",
-  "tcpStatus_connecting": "Підключення до TCP-кінцевої точки...",
   "tcpStatus_connectingTo": "Підключення до {endpoint}...",
   "tcpErrorHostRequired": "Необхідно вказати IP-адресу.",
   "tcpErrorPortInvalid": "Порт повинен бути в межах від 1 до 65535.",

lib/l10n/app_zh.arb

@@ -1883,10 +1883,9 @@
   "tcpHostHint": "192.168.40.10",
   "tcpScreenTitle": "通过 TCP 连接",
   "connectionChoiceTcpLabel": "TCP",
-  "tcpPortLabel": "港",
+  "tcpPortLabel": "端口",
   "tcpPortHint": "5000",
   "tcpStatus_notConnected": "输入目标地址，然后连接",
-  "tcpStatus_connecting": "连接到 TCP 终点...",
   "tcpStatus_connectingTo": "连接到 {endpoint}...",
   "tcpErrorHostRequired": "需要提供IP地址。",
   "tcpErrorPortInvalid": "端口号必须在 1 到 65535 之间。",

lib/screens/tcp_screen.dart

@@ -27,7 +27,7 @@ class _TcpScreenState extends State<TcpScreen> {
   @override
   void initState() {
     super.initState();
-    _hostController = TextEditingController(text: '192.168.40.10');
+    _hostController = TextEditingController();
     _portController = TextEditingController(text: '5000');
     _connector = context.read<MeshCoreConnector>();
 
@@ -81,6 +81,9 @@ class _TcpScreenState extends State<TcpScreen> {
             final isConnecting =
                 connector.state == MeshCoreConnectionState.connecting &&
                 connector.activeTransport == MeshCoreTransportType.tcp;
+            final isButtonDisabled =
+                isConnecting ||
+                connector.state == MeshCoreConnectionState.scanning;
             return Column(
               children: [
                 _buildStatusBar(context, connector),
@@ -112,7 +115,8 @@ class _TcpScreenState extends State<TcpScreen> {
                       ),
                       const SizedBox(height: 16),
                       FilledButton.icon(
-                        onPressed: isConnecting ? null : _connectTcp,
+                        key: const Key('tcp_connect_button'),
+                        onPressed: isButtonDisabled ? null : _connectTcp,
                         icon: isConnecting
                             ? const SizedBox(
                                 width: 18,
@@ -153,6 +157,7 @@ class _TcpScreenState extends State<TcpScreen> {
                     );
                   },
                   heroTag: 'tcp_usb_action',
+                  extendedPadding: const EdgeInsets.symmetric(horizontal: 12),
                   icon: const Icon(Icons.usb),
                   label: Text(context.l10n.connectionChoiceUsbLabel),
                 ),
@@ -162,6 +167,7 @@ class _TcpScreenState extends State<TcpScreen> {
                   Navigator.of(context).maybePop();
                 },
                 heroTag: 'tcp_ble_action',
+                extendedPadding: const EdgeInsets.symmetric(horizontal: 12),
                 icon: const Icon(Icons.bluetooth),
                 label: Text(context.l10n.connectionChoiceBluetoothLabel),
               ),

test/screens/tcp_flow_test.dart

@@ -93,7 +93,7 @@ void main() {
     final l10n = AppLocalizations.of(context);
 
     await tester.enterText(find.byType(TextField).first, '');
-    await tester.tap(find.widgetWithText(FilledButton, 'Connect'));
+    await tester.tap(find.byKey(const Key('tcp_connect_button')));
     await tester.pumpAndSettle();
 
     expect(find.text(l10n.tcpErrorHostRequired), findsOneWidget);
@@ -101,7 +101,7 @@ void main() {
 
     await tester.enterText(find.byType(TextField).first, '192.168.1.50');
     await tester.enterText(find.byType(TextField).at(1), '99999');
-    await tester.tap(find.widgetWithText(FilledButton, 'Connect'));
+    await tester.tap(find.byKey(const Key('tcp_connect_button')));
     await tester.pumpAndSettle();
 
     expect(connector.connectTcpCalls, 0);
@@ -135,7 +135,7 @@ void main() {
     await tester.pump(const Duration(milliseconds: 60));
   });
 
-  testWidgets('TcpScreen allows connect while connector is scanning', (
+  testWidgets('TcpScreen disables connect button while connector is scanning', (
     tester,
   ) async {
     final connector = _FakeMeshCoreConnector()
@@ -150,12 +150,11 @@ void main() {
     );
     await tester.pumpAndSettle();
 
-    await tester.tap(find.widgetWithText(FilledButton, 'Connect'));
-    await tester.pumpAndSettle();
-
-    expect(connector.connectTcpCalls, 1);
-    expect(connector.lastHost, '192.168.40.10');
-    expect(connector.lastPort, 5000);
+    final button = tester.widget<ButtonStyleButton>(
+      find.byKey(const Key('tcp_connect_button')),
+    );
+    expect(button.onPressed, isNull);
+    expect(connector.connectTcpCalls, 0);
   });
 
   testWidgets('TcpScreen narrow width long status text does not overflow', (