fix(app): use language code for locale

- Update locale setting to use language.code instead of just language
- This ensures proper locale initialization when the app is restarted

Author: fulleni

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,
                 ),
               ),
             ),