feat(alarmas): surface scheduling failures on the alarm card

Wires EstadoAlarmas.ultimaExcepcionPara into PantallaAlarmas: an
alarm with an outstanding scheduling-failure exception now shows a
calm warning line (distinguishing a pre-notice-only failure from the
alarm itself not being registered) with a tap target into the
reliability diagnostics screen. The warning is its own small tap
target nested inside the existing card InkWell, so tap-to-edit,
swipe-to-delete and the hero "Saltar" chip are untouched.

Adds alarmCardSchedulingFailedMessage/alarmCardPreNoticeFailedMessage
to all 13 ARB locales with real per-language translations (verified
against arb_parity_test and arb_anti_copy_test).

lib/l10n/gen/app_localizations_ru.dart

@@ -1707,6 +1707,14 @@ class AppLocalizationsRu extends AppLocalizations {
   @override
   String get alarmCardVacationPausedBadge => 'Приостановлено на время отпуска';
 
+  @override
+  String get alarmCardSchedulingFailedMessage =>
+      'Этот будильник не удалось зарегистрировать в системе, поэтому он может не сработать.';
+
+  @override
+  String get alarmCardPreNoticeFailedMessage =>
+      'Этот будильник запланирован, но не удалось настроить предварительное напоминание.';
+
   @override
   String get alarmDiagnosticsExactAlarmsTitle =>
       'Точное планирование будильника';