feat: add message translation support

- Introduced translation functionality in chat screen, allowing users to translate messages before sending.
- Added MessageTranslationButton to the input bar for enabling/disabling translation.
- Implemented translation service to handle incoming and outgoing text translations using llama models.
- Enhanced message storage to include original and translated text, language codes, and translation status.
- Created UI components for displaying translated messages and managing translation options.
- Added translation model management, including downloading and storing models locally.
- Updated app settings to manage translation preferences and model selections.

lib/main.dart

@@ -19,6 +19,7 @@ import 'services/app_debug_log_service.dart';
 import 'services/background_service.dart';
 import 'services/map_tile_cache_service.dart';
 import 'services/chat_text_scale_service.dart';
+import 'services/translation_service.dart';
 import 'services/ui_view_state_service.dart';
 import 'services/timeout_prediction_service.dart';
 import 'storage/prefs_manager.dart';
@@ -41,6 +42,7 @@ void main() async {
   final backgroundService = BackgroundService();
   final mapTileCacheService = MapTileCacheService();
   final chatTextScaleService = ChatTextScaleService();
+  final translationService = TranslationService(appSettingsService);
   final uiViewStateService = UiViewStateService();
   final timeoutPredictionService = TimeoutPredictionService(storage);
 
@@ -60,6 +62,7 @@ void main() async {
   _registerThirdPartyLicenses();
 
   await chatTextScaleService.initialize();
+  await translationService.refreshDownloadedModels();
   await uiViewStateService.initialize();
   await timeoutPredictionService.initialize();
 
@@ -68,6 +71,7 @@ void main() async {
     retryService: retryService,
     pathHistoryService: pathHistoryService,
     appSettingsService: appSettingsService,
+    translationService: translationService,
     bleDebugLogService: bleDebugLogService,
     appDebugLogService: appDebugLogService,
     backgroundService: backgroundService,
@@ -93,6 +97,7 @@ void main() async {
       appDebugLogService: appDebugLogService,
       mapTileCacheService: mapTileCacheService,
       chatTextScaleService: chatTextScaleService,
+      translationService: translationService,
       uiViewStateService: uiViewStateService,
       timeoutPredictionService: timeoutPredictionService,
     ),
@@ -130,6 +135,7 @@ class MeshCoreApp extends StatelessWidget {
   final AppDebugLogService appDebugLogService;
   final MapTileCacheService mapTileCacheService;
   final ChatTextScaleService chatTextScaleService;
+  final TranslationService translationService;
   final UiViewStateService uiViewStateService;
   final TimeoutPredictionService timeoutPredictionService;
 
@@ -144,6 +150,7 @@ class MeshCoreApp extends StatelessWidget {
     required this.appDebugLogService,
     required this.mapTileCacheService,
     required this.chatTextScaleService,
+    required this.translationService,
     required this.uiViewStateService,
     required this.timeoutPredictionService,
   });
@@ -159,6 +166,7 @@ class MeshCoreApp extends StatelessWidget {
         ChangeNotifierProvider.value(value: bleDebugLogService),
         ChangeNotifierProvider.value(value: appDebugLogService),
         ChangeNotifierProvider.value(value: chatTextScaleService),
+        ChangeNotifierProvider.value(value: translationService),
         ChangeNotifierProvider.value(value: uiViewStateService),
         Provider.value(value: storage),
         Provider.value(value: mapTileCacheService),