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_zh.dart

@@ -1638,6 +1638,12 @@ class AppLocalizationsZh extends AppLocalizations {
   @override
   String get alarmCardVacationPausedBadge => '因假期已暂停';
 
+  @override
+  String get alarmCardSchedulingFailedMessage => '该闹钟未能在系统中注册，因此可能不会响铃。';
+
+  @override
+  String get alarmCardPreNoticeFailedMessage => '该闹钟已设置，但其提前提醒未能设置成功。';
+
   @override
   String get alarmDiagnosticsExactAlarmsTitle => '精确闹钟排程';