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_fr.dart

@@ -1716,6 +1716,14 @@ class AppLocalizationsFr extends AppLocalizations {
   @override
   String get alarmCardVacationPausedBadge => 'En pause pour les vacances';
 
+  @override
+  String get alarmCardSchedulingFailedMessage =>
+      'Cette alarme n\'a pas pu être enregistrée dans le système ; elle risque donc de ne pas sonner.';
+
+  @override
+  String get alarmCardPreNoticeFailedMessage =>
+      'Cette alarme est programmée, mais son rappel anticipé n\'a pas pu être activé.';
+
   @override
   String get alarmDiagnosticsExactAlarmsTitle =>
       'Programmation d\'alarme précise';