fix(app): say it out loud when wake-ups do not work

Registration failures from the distributor were swallowed, so push looked
enabled while nothing arrived. Without wake-ups Android suspends the app
and messages only show up once the user opens it — which looks like broken
delivery even though the relay has them queued.

The failure is now remembered and surfaced in Settings, and the chat list
carries a dismissible line explaining the state.

app/lib/l10n/generated/app_localizations_it.dart

@@ -969,6 +969,18 @@ class AppLocalizationsIt extends AppLocalizations {
     return 'Configurazione delle notifiche push non riuscita: $error';
   }
 
+  @override
+  String get pushHintOff =>
+      'I messaggi arrivano solo quando apri Šepot — le notifiche non sono configurate.';
+
+  @override
+  String get pushHintFailed =>
+      'Le notifiche non funzionano: vedrai i messaggi solo aprendo Šepot.';
+
+  @override
+  String get pushRegistrationFailed =>
+      'Le notifiche non arrivano — il distributore ha rifiutato la registrazione. Prova a disattivare e riattivare il push.';
+
   @override
   String get pushNoDistributorTitle => 'Nessun distributore';