Refactor USB screen, add debug logging, fix UI issues

- Rewrite UsbScreen to mirror ScannerScreen patterns (status bar,
  tap-to-connect port list, bottom FABs, SnackBar errors)
- Extract MeshCoreUsbManager from MeshCoreConnector for cleaner
  USB transport ownership
- Add debug logging throughout USB connection flow (connector,
  manager, web/native services)
- Print debug logs to console in debug mode even when app debug
  log setting is disabled
- Localize remaining hardcoded strings (Web Serial Device fallback
  label, USB status bar keys, companion firmware timeout hint)
- Fix Swedish misspelling in translations (stöderliga → stödda)
- Guard Linux notification init against missing D-Bus session bus
- Fix SNRIndicator hit-test error by adding minimum size constraints
- Update USB flow tests for new UI patterns

lib/l10n/app_localizations_es.dart

@@ -177,7 +177,24 @@ class AppLocalizationsEs extends AppLocalizations {
 
   @override
   String get usbErrorConnectTimedOut =>
-      'Se ha agotado el tiempo de espera mientras se esperaba la respuesta del dispositivo.';
+      'La conexión ha caducado. Asegúrese de que el dispositivo tenga el firmware USB Companion.';
+
+  @override
+  String get usbFallbackDeviceName => 'Dispositivo de serie web';
+
+  @override
+  String get usbStatus_notConnected => 'Seleccione un dispositivo USB';
+
+  @override
+  String get usbStatus_connecting => 'Conectándose al dispositivo USB...';
+
+  @override
+  String get usbStatus_searching => 'Buscando dispositivos USB...';
+
+  @override
+  String usbConnectionFailed(String error) {
+    return 'Error al conectar mediante USB: $error';
+  }
 
   @override
   String get scanner_scanning => 'Escaneando dispositivos...';