feat: Add TCP connection support and UI integration

- Implemented TCP transport service for native platforms.
- Added TCP connection screen with input fields for host and port.
- Integrated TCP connection options into the scanner and USB screens.
- Updated localization files for new TCP-related strings.
- Added tests for TCP connection flow and error handling.
- Enhanced USB screen to include TCP connection option.
- Improved layout to ensure no overflow in narrow widths for scanner and USB screens.

lib/l10n/app_en.arb

@@ -49,6 +49,34 @@
   "scanner_title": "MeshCore Open",
   "connectionChoiceUsbLabel": "USB",
   "connectionChoiceBluetoothLabel": "Bluetooth",
+  "connectionChoiceTcpLabel": "TCP",
+  "tcpScreenTitle": "Connect over TCP",
+  "tcpHostLabel": "IP Address",
+  "tcpHostHint": "192.168.40.10",
+  "tcpPortLabel": "Port",
+  "tcpPortHint": "5000",
+  "tcpStatus_notConnected": "Enter endpoint and connect",
+  "tcpStatus_connecting": "Connecting to TCP endpoint...",
+  "tcpStatus_connectingTo": "Connecting to {endpoint}...",
+  "@tcpStatus_connectingTo": {
+    "placeholders": {
+      "endpoint": {
+        "type": "String"
+      }
+    }
+  },
+  "tcpErrorHostRequired": "IP address is required.",
+  "tcpErrorPortInvalid": "Port must be between 1 and 65535.",
+  "tcpErrorUnsupported": "TCP transport is not supported on this platform.",
+  "tcpErrorTimedOut": "TCP connection timed out.",
+  "tcpConnectionFailed": "TCP connection failed: {error}",
+  "@tcpConnectionFailed": {
+    "placeholders": {
+      "error": {
+        "type": "String"
+      }
+    }
+  },
   "usbScreenTitle": "Connect over USB",
   "usbScreenSubtitle": "Choose a detected serial device and connect directly to your MeshCore node.",
   "usbScreenStatus": "Select a USB device",
@@ -1898,4 +1926,4 @@
   "discoveredContacts_deleteContact": "Delete Discovered Contact",
   "discoveredContacts_deleteContactAll": "Delete All Discovered Contacts",
   "discoveredContacts_deleteContactAllContent": "Are you sure you want to delete all discovered contacts?"
-}
+}