Sync the dashbaord with the core models change

lib/app/bloc/app_bloc.dart

@@ -82,13 +82,18 @@ class AppBloc extends Bloc<AppEvent, AppState> {
           displaySettings: const DisplaySettings(
             baseTheme: AppBaseTheme.system,
             accentTheme: AppAccentTheme.defaultBlue,
-            fontFamily: 'SystemDefault',
-            textScaleFactor: AppTextScaleFactor.medium,
-            fontWeight: AppFontWeight.regular,
+          fontFamily: 'SystemDefault',
+          textScaleFactor: AppTextScaleFactor.medium,
+          fontWeight: AppFontWeight.regular,
+        ),
+        language: languagesFixturesData.firstWhere(
+          (l) => l.code == 'en',
+          orElse: () => throw StateError(
+            'Default language "en" not found in language fixtures.',
           ),
-          language: 'en',
-          feedPreferences: const FeedDisplayPreferences(
-            headlineDensity: HeadlineDensity.standard,
+        ),
+        feedPreferences: const FeedDisplayPreferences(
+          headlineDensity: HeadlineDensity.standard,
             headlineImageStyle: HeadlineImageStyle.largeThumbnail,
             showSourceInHeadlineFeed: true,
             showPublishDateInHeadlineFeed: true,

lib/app/view/app.dart

@@ -233,7 +233,7 @@ class _AppViewState extends State<_AppView> {
                     AppBaseTheme.dark => ThemeMode.dark,
                     _ => ThemeMode.system,
                   },
-                  locale: language != null ? Locale(language) : null,
+                  locale: language != null ? Locale(language.code) : null,
                 ),
               ),
             ),