feat(remote): remember manual host address

close #1074

lib/services/settings_service.dart

@@ -357,6 +357,10 @@ class SettingsService extends BaseSharedPreferencesService {
   static const customDownloadPath = NullableStringPref('custom_download_path');
   static final customRelayUrl = NullableStringPref('custom_relay_url', transform: _trimEmptyAsNull);
   static const recentRooms = NullableStringPref('watch_together_recent_rooms');
+  static final companionRemoteLastHostAddress = NullableStringPref(
+    'companion_remote_last_host_address',
+    transform: _trimEmptyAsNull,
+  );
 
   static final maxVolume = IntPref('max_volume', defaultValue: 100, transform: (v) => v.clamp(100, 300));
   static final subtitlePosition = IntPref('subtitle_position', defaultValue: 100, transform: (v) => v.clamp(0, 100));
@@ -736,6 +740,7 @@ class SettingsService extends BaseSharedPreferencesService {
     selectedExternalPlayer,
     customExternalPlayers,
     customRelayUrl,
+    companionRemoteLastHostAddress,
   ];
 
   Future<void> resetAllSettings() async {

lib/widgets/companion_remote/discovery_view.dart

@@ -16,6 +16,7 @@ import '../../profiles/active_profile_provider.dart';
 import '../../profiles/plex_home_service.dart';
 import '../../profiles/profile_connection_registry.dart';
 import '../../providers/companion_remote_provider.dart';
+import '../../services/settings_service.dart';
 import '../../utils/app_logger.dart';
 import '../loading_indicator_box.dart';
 
@@ -48,9 +49,20 @@ class _DiscoveryViewState extends State<DiscoveryView> with ControllerDisposerMi
   void initState() {
     super.initState();
     _provider = context.read<CompanionRemoteProvider>();
+    unawaited(_loadSavedManualHostAddress());
     _initCryptoAndDiscover();
   }
 
+  Future<void> _loadSavedManualHostAddress() async {
+    final settings = SettingsService.instanceOrNull ?? await SettingsService.getInstance();
+    final hostAddress = settings.read(SettingsService.companionRemoteLastHostAddress);
+    if (!mounted || hostAddress == null || _hostAddressController.text.isNotEmpty) return;
+    setState(() {
+      _hostAddressController.text = hostAddress;
+      _showManualEntry = true;
+    });
+  }
+
   Future<void> _initCryptoAndDiscover() async {
     final connections = context.read<ConnectionRegistry>();
     final activeProfile = context.read<ActiveProfileProvider>();
@@ -140,6 +152,26 @@ class _DiscoveryViewState extends State<DiscoveryView> with ControllerDisposerMi
     }
   }
 
+  Future<void> _saveManualHostAddress(String hostAddress) async {
+    try {
+      final settings = SettingsService.instanceOrNull ?? await SettingsService.getInstance();
+      await settings.write(SettingsService.companionRemoteLastHostAddress, hostAddress);
+    } catch (e) {
+      appLogger.w('Failed to save companion remote host address', error: e);
+    }
+  }
+
+  void _submitManualHost() {
+    if (!_formKey.currentState!.validate()) return;
+    final hostAddress = _hostAddressController.text.trim();
+    unawaited(
+      _connect(() async {
+        await _provider.connectToManualHost(hostAddress);
+        await _saveManualHostAddress(hostAddress);
+      }),
+    );
+  }
+
   String _parseErrorMessage(String error) {
     if (error.contains('timeout') || error.contains('Timed out')) {
       return t.companionRemote.pairing.connectionTimedOut;
@@ -340,10 +372,11 @@ class _DiscoveryViewState extends State<DiscoveryView> with ControllerDisposerMi
                     prefixIcon: const Icon(Icons.computer),
                   ),
                   validator: (value) {
-                    if (value == null || value.isEmpty) {
+                    final hostAddress = value?.trim() ?? '';
+                    if (hostAddress.isEmpty) {
                       return t.companionRemote.pairing.validationHostRequired;
                     }
-                    if (value.split(':').length != 2) {
+                    if (hostAddress.split(':').length != 2) {
                       return t.companionRemote.pairing.validationHostFormat;
                     }
                     return null;
@@ -356,19 +389,9 @@ class _DiscoveryViewState extends State<DiscoveryView> with ControllerDisposerMi
                 FocusableButton(
                   focusNode: _connectFocusNode,
                   onNavigateUp: _hostAddressFocusNode.requestFocus,
-                  onPressed: _isConnecting
-                      ? null
-                      : () {
-                          if (!_formKey.currentState!.validate()) return;
-                          _connect(() => _provider.connectToManualHost(_hostAddressController.text.trim()));
-                        },
+                  onPressed: _isConnecting ? null : _submitManualHost,
                   child: FilledButton.icon(
-                    onPressed: _isConnecting
-                        ? null
-                        : () {
-                            if (!_formKey.currentState!.validate()) return;
-                            _connect(() => _provider.connectToManualHost(_hostAddressController.text.trim()));
-                          },
+                    onPressed: _isConnecting ? null : _submitManualHost,
                     icon: _isConnecting ? const LoadingIndicatorBox(size: 16) : const Icon(Icons.link),
                     label: Text(_isConnecting ? t.companionRemote.pairing.connecting : t.common.connect),
                   ),