Merge branch 'main' into spike/block2-derisking

# Conflicts:
#	apps/app_seeds/lib/i18n/strings.g.dart

apps/app_seeds/lib/app.dart

@@ -206,7 +206,11 @@ class TaneApp extends StatelessWidget {
           // desktop (Flutter disables that by default), so the photo carousel and
           // lists swipe there too.
           scrollBehavior: const _DragScrollBehavior(),
-          locale: TranslationProvider.of(context).flutterLocale,
+          // Flutter ships no Material/Cupertino localizations for Asturian
+          // (`ast`), so render the framework chrome (date pickers, native dialog
+          // buttons) in Spanish — the closest shipped language — while the app's
+          // own text stays Asturian via slang. Every other locale maps 1:1.
+          locale: materialLocaleFor(TranslationProvider.of(context).flutterLocale),
           supportedLocales: AppLocaleUtils.supportedLocales,
           localizationsDelegates: const [
             GlobalMaterialLocalizations.delegate,
@@ -224,6 +228,14 @@ class TaneApp extends StatelessWidget {
   }
 }
 
+/// Maps the app's active locale to one Flutter's bundled Material/Cupertino
+/// localizations can serve. Asturian (`ast`) has none, so it borrows Spanish
+/// (`es`) for the framework chrome; the app's own strings stay Asturian (they
+/// come from slang, not from `Localizations`). All other locales pass through.
+@visibleForTesting
+Locale materialLocaleFor(Locale locale) =>
+    locale.languageCode == 'ast' ? const Locale('es') : locale;
+
 /// Enables mouse/trackpad drag scrolling (off by default on desktop) so the
 /// photo carousel and lists can be swiped with a pointer.
 class _DragScrollBehavior extends MaterialScrollBehavior {