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/app_ar.arb

@@ -842,6 +842,8 @@
     }
   },
   "alarmCardVacationPausedBadge": "متوقفة مؤقتًا بسبب الإجازة",
+  "alarmCardSchedulingFailedMessage": "لم يتم تسجيل هذا المنبه في النظام، لذا قد لا يرن.",
+  "alarmCardPreNoticeFailedMessage": "تمت جدولة هذا المنبه، لكن تعذّر ضبط تذكيره المسبق.",
   "alarmDiagnosticsExactAlarmsTitle": "جدولة المنبه بدقة",
   "alarmDiagnosticsExactAlarmsHint": "يتيح رنين المنبه في الدقيقة المحددة تمامًا، حتى عندما يكون الهاتف في وضع السكون.",
   "alarmDiagnosticsNotificationsTitle": "الإشعارات",

lib/l10n/app_bn.arb

@@ -842,6 +842,8 @@
     }
   },
   "alarmCardVacationPausedBadge": "ছুটির কারণে বিরত",
+  "alarmCardSchedulingFailedMessage": "এই অ্যালার্মটি সিস্টেমে নিবন্ধন করা যায়নি, তাই এটি নাও বাজতে পারে।",
+  "alarmCardPreNoticeFailedMessage": "এই অ্যালার্মটি নির্ধারিত হয়েছে, তবে এর আগাম রিমাইন্ডার সেট করা যায়নি।",
   "alarmDiagnosticsExactAlarmsTitle": "নির্ভুল অ্যালার্ম শিডিউলিং",
   "alarmDiagnosticsExactAlarmsHint": "ফোন ঘুমন্ত অবস্থায় থাকলেও অ্যালার্মকে ঠিক নির্ধারিত মিনিটে বাজতে দেয়।",
   "alarmDiagnosticsNotificationsTitle": "বিজ্ঞপ্তি",

lib/l10n/app_de.arb

@@ -842,6 +842,8 @@
     }
   },
   "alarmCardVacationPausedBadge": "Wegen Urlaub pausiert",
+  "alarmCardSchedulingFailedMessage": "Dieser Alarm konnte nicht im System registriert werden, daher klingelt er möglicherweise nicht.",
+  "alarmCardPreNoticeFailedMessage": "Dieser Alarm ist geplant, aber seine Vorwarnung konnte nicht eingerichtet werden.",
   "alarmDiagnosticsExactAlarmsTitle": "Genaue Alarmplanung",
   "alarmDiagnosticsExactAlarmsHint": "Lässt den Alarm genau zur eingestellten Minute klingeln, auch wenn das Telefon im Ruhezustand ist.",
   "alarmDiagnosticsNotificationsTitle": "Benachrichtigungen",

lib/l10n/app_en.arb

@@ -842,6 +842,8 @@
     }
   },
   "alarmCardVacationPausedBadge": "Paused for vacation",
+  "alarmCardSchedulingFailedMessage": "This alarm could not be registered with the system, so it may not ring.",
+  "alarmCardPreNoticeFailedMessage": "This alarm is scheduled, but its early reminder could not be set.",
   "alarmDiagnosticsExactAlarmsTitle": "Exact alarm scheduling",
   "alarmDiagnosticsExactAlarmsHint": "Lets the alarm ring at the exact minute you set, even while the phone is asleep.",
   "alarmDiagnosticsNotificationsTitle": "Notifications",

lib/l10n/app_es.arb

@@ -801,6 +801,8 @@
     }
   },
   "alarmCardVacationPausedBadge": "Pausada por vacaciones",
+  "alarmCardSchedulingFailedMessage": "Esta alarma no se pudo registrar en el sistema, así que podría no sonar.",
+  "alarmCardPreNoticeFailedMessage": "Esta alarma está programada, pero no se pudo activar su aviso previo.",
   "alarmDiagnosticsExactAlarmsTitle": "Programación de alarma exacta",
   "alarmDiagnosticsExactAlarmsHint": "Permite que la alarma suene en el minuto exacto que elegiste, incluso con el teléfono en reposo.",
   "alarmDiagnosticsNotificationsTitle": "Notificaciones",

lib/l10n/app_fr.arb

@@ -842,6 +842,8 @@
     }
   },
   "alarmCardVacationPausedBadge": "En pause pour les vacances",
+  "alarmCardSchedulingFailedMessage": "Cette alarme n'a pas pu être enregistrée dans le système ; elle risque donc de ne pas sonner.",
+  "alarmCardPreNoticeFailedMessage": "Cette alarme est programmée, mais son rappel anticipé n'a pas pu être activé.",
   "alarmDiagnosticsExactAlarmsTitle": "Programmation d'alarme précise",
   "alarmDiagnosticsExactAlarmsHint": "Permet à l'alarme de sonner à la minute exacte choisie, même si le téléphone est en veille.",
   "alarmDiagnosticsNotificationsTitle": "Notifications",

lib/l10n/app_hi.arb

@@ -842,6 +842,8 @@
     }
   },
   "alarmCardVacationPausedBadge": "छुट्टी के कारण रोका गया",
+  "alarmCardSchedulingFailedMessage": "यह अलार्म सिस्टम में दर्ज नहीं हो सका, इसलिए यह शायद न बजे।",
+  "alarmCardPreNoticeFailedMessage": "यह अलार्म शेड्यूल किया गया है, लेकिन इसकी पूर्व-चेतावनी सेट नहीं हो सकी।",
   "alarmDiagnosticsExactAlarmsTitle": "सटीक अलार्म शेड्यूलिंग",
   "alarmDiagnosticsExactAlarmsHint": "फ़ोन के सुप्त मोड में होने पर भी अलार्म को ठीक तय किए गए मिनट पर बजने देता है।",
   "alarmDiagnosticsNotificationsTitle": "सूचनाएं",

lib/l10n/app_id.arb

@@ -842,6 +842,8 @@
     }
   },
   "alarmCardVacationPausedBadge": "Dijeda karena liburan",
+  "alarmCardSchedulingFailedMessage": "Alarm ini tidak dapat didaftarkan ke sistem, sehingga mungkin tidak berbunyi.",
+  "alarmCardPreNoticeFailedMessage": "Alarm ini sudah dijadwalkan, tetapi pengingat awalnya tidak dapat diatur.",
   "alarmDiagnosticsExactAlarmsTitle": "Penjadwalan alarm presisi",
   "alarmDiagnosticsExactAlarmsHint": "Membuat alarm berbunyi tepat pada menit yang kamu atur, meski ponsel dalam mode tidur.",
   "alarmDiagnosticsNotificationsTitle": "Notifikasi",

lib/l10n/app_it.arb

@@ -842,6 +842,8 @@
     }
   },
   "alarmCardVacationPausedBadge": "In pausa per le vacanze",
+  "alarmCardSchedulingFailedMessage": "Questa sveglia non è stata registrata nel sistema, quindi potrebbe non suonare.",
+  "alarmCardPreNoticeFailedMessage": "Questa sveglia è programmata, ma non è stato possibile impostare il promemoria anticipato.",
   "alarmDiagnosticsExactAlarmsTitle": "Programmazione sveglia esatta",
   "alarmDiagnosticsExactAlarmsHint": "Permette alla sveglia di suonare esattamente al minuto impostato, anche a telefono in stand-by.",
   "alarmDiagnosticsNotificationsTitle": "Notifiche",

lib/l10n/app_ja.arb

@@ -842,6 +842,8 @@
     }
   },
   "alarmCardVacationPausedBadge": "休暇のため一時停止中",
+  "alarmCardSchedulingFailedMessage": "このアラームはシステムに登録できなかったため、鳴らない可能性があります。",
+  "alarmCardPreNoticeFailedMessage": "このアラームは設定されていますが、事前通知を設定できませんでした。",
   "alarmDiagnosticsExactAlarmsTitle": "正確なアラームのスケジュール設定",
   "alarmDiagnosticsExactAlarmsHint": "スマートフォンがスリープ中でも、設定した時刻ちょうどにアラームを鳴らせるようにします。",
   "alarmDiagnosticsNotificationsTitle": "通知",

lib/l10n/app_pt.arb

@@ -842,6 +842,8 @@
     }
   },
   "alarmCardVacationPausedBadge": "Pausada por férias",
+  "alarmCardSchedulingFailedMessage": "Este alarme não pôde ser registrado no sistema, por isso pode não tocar.",
+  "alarmCardPreNoticeFailedMessage": "Este alarme está agendado, mas seu aviso antecipado não pôde ser configurado.",
   "alarmDiagnosticsExactAlarmsTitle": "Agendamento exato do alarme",
   "alarmDiagnosticsExactAlarmsHint": "Permite que o alarme toque no minuto exato definido, mesmo com o telefone em repouso.",
   "alarmDiagnosticsNotificationsTitle": "Notificações",

lib/l10n/app_ru.arb

@@ -842,6 +842,8 @@
     }
   },
   "alarmCardVacationPausedBadge": "Приостановлено на время отпуска",
+  "alarmCardSchedulingFailedMessage": "Этот будильник не удалось зарегистрировать в системе, поэтому он может не сработать.",
+  "alarmCardPreNoticeFailedMessage": "Этот будильник запланирован, но не удалось настроить предварительное напоминание.",
   "alarmDiagnosticsExactAlarmsTitle": "Точное планирование будильника",
   "alarmDiagnosticsExactAlarmsHint": "Будильник звонит ровно в заданную минуту, даже если телефон находится в режиме сна.",
   "alarmDiagnosticsNotificationsTitle": "Уведомления",

lib/l10n/app_zh.arb

@@ -842,6 +842,8 @@
     }
   },
   "alarmCardVacationPausedBadge": "因假期已暂停",
+  "alarmCardSchedulingFailedMessage": "该闹钟未能在系统中注册，因此可能不会响铃。",
+  "alarmCardPreNoticeFailedMessage": "该闹钟已设置，但其提前提醒未能设置成功。",
   "alarmDiagnosticsExactAlarmsTitle": "精确闹钟排程",
   "alarmDiagnosticsExactAlarmsHint": "即使手机处于休眠状态，也能让闹钟在设定的准确时间响起。",
   "alarmDiagnosticsNotificationsTitle": "通知",

lib/l10n/gen/app_localizations.dart

@@ -3074,6 +3074,18 @@ abstract class AppLocalizations {
   /// **'Pausada por vacaciones'**
   String get alarmCardVacationPausedBadge;
 
+  /// No description provided for @alarmCardSchedulingFailedMessage.
+  ///
+  /// In es, this message translates to:
+  /// **'Esta alarma no se pudo registrar en el sistema, así que podría no sonar.'**
+  String get alarmCardSchedulingFailedMessage;
+
+  /// No description provided for @alarmCardPreNoticeFailedMessage.
+  ///
+  /// In es, this message translates to:
+  /// **'Esta alarma está programada, pero no se pudo activar su aviso previo.'**
+  String get alarmCardPreNoticeFailedMessage;
+
   /// No description provided for @alarmDiagnosticsExactAlarmsTitle.
   ///
   /// In es, this message translates to:

lib/l10n/gen/app_localizations_ar.dart

@@ -1691,6 +1691,14 @@ class AppLocalizationsAr extends AppLocalizations {
   @override
   String get alarmCardVacationPausedBadge => 'متوقفة مؤقتًا بسبب الإجازة';
 
+  @override
+  String get alarmCardSchedulingFailedMessage =>
+      'لم يتم تسجيل هذا المنبه في النظام، لذا قد لا يرن.';
+
+  @override
+  String get alarmCardPreNoticeFailedMessage =>
+      'تمت جدولة هذا المنبه، لكن تعذّر ضبط تذكيره المسبق.';
+
   @override
   String get alarmDiagnosticsExactAlarmsTitle => 'جدولة المنبه بدقة';
 

lib/l10n/gen/app_localizations_bn.dart

@@ -1700,6 +1700,14 @@ class AppLocalizationsBn extends AppLocalizations {
   @override
   String get alarmCardVacationPausedBadge => 'ছুটির কারণে বিরত';
 
+  @override
+  String get alarmCardSchedulingFailedMessage =>
+      'এই অ্যালার্মটি সিস্টেমে নিবন্ধন করা যায়নি, তাই এটি নাও বাজতে পারে।';
+
+  @override
+  String get alarmCardPreNoticeFailedMessage =>
+      'এই অ্যালার্মটি নির্ধারিত হয়েছে, তবে এর আগাম রিমাইন্ডার সেট করা যায়নি।';
+
   @override
   String get alarmDiagnosticsExactAlarmsTitle => 'নির্ভুল অ্যালার্ম শিডিউলিং';
 

lib/l10n/gen/app_localizations_de.dart

@@ -1713,6 +1713,14 @@ class AppLocalizationsDe extends AppLocalizations {
   @override
   String get alarmCardVacationPausedBadge => 'Wegen Urlaub pausiert';
 
+  @override
+  String get alarmCardSchedulingFailedMessage =>
+      'Dieser Alarm konnte nicht im System registriert werden, daher klingelt er möglicherweise nicht.';
+
+  @override
+  String get alarmCardPreNoticeFailedMessage =>
+      'Dieser Alarm ist geplant, aber seine Vorwarnung konnte nicht eingerichtet werden.';
+
   @override
   String get alarmDiagnosticsExactAlarmsTitle => 'Genaue Alarmplanung';
 

lib/l10n/gen/app_localizations_en.dart

@@ -1693,6 +1693,14 @@ class AppLocalizationsEn extends AppLocalizations {
   @override
   String get alarmCardVacationPausedBadge => 'Paused for vacation';
 
+  @override
+  String get alarmCardSchedulingFailedMessage =>
+      'This alarm could not be registered with the system, so it may not ring.';
+
+  @override
+  String get alarmCardPreNoticeFailedMessage =>
+      'This alarm is scheduled, but its early reminder could not be set.';
+
   @override
   String get alarmDiagnosticsExactAlarmsTitle => 'Exact alarm scheduling';
 

lib/l10n/gen/app_localizations_es.dart

@@ -1707,6 +1707,14 @@ class AppLocalizationsEs extends AppLocalizations {
   @override
   String get alarmCardVacationPausedBadge => 'Pausada por vacaciones';
 
+  @override
+  String get alarmCardSchedulingFailedMessage =>
+      'Esta alarma no se pudo registrar en el sistema, así que podría no sonar.';
+
+  @override
+  String get alarmCardPreNoticeFailedMessage =>
+      'Esta alarma está programada, pero no se pudo activar su aviso previo.';
+
   @override
   String get alarmDiagnosticsExactAlarmsTitle =>
       'Programación de alarma exacta';

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';

lib/l10n/gen/app_localizations_hi.dart

@@ -1695,6 +1695,14 @@ class AppLocalizationsHi extends AppLocalizations {
   @override
   String get alarmCardVacationPausedBadge => 'छुट्टी के कारण रोका गया';
 
+  @override
+  String get alarmCardSchedulingFailedMessage =>
+      'यह अलार्म सिस्टम में दर्ज नहीं हो सका, इसलिए यह शायद न बजे।';
+
+  @override
+  String get alarmCardPreNoticeFailedMessage =>
+      'यह अलार्म शेड्यूल किया गया है, लेकिन इसकी पूर्व-चेतावनी सेट नहीं हो सकी।';
+
   @override
   String get alarmDiagnosticsExactAlarmsTitle => 'सटीक अलार्म शेड्यूलिंग';
 

lib/l10n/gen/app_localizations_id.dart

@@ -1703,6 +1703,14 @@ class AppLocalizationsId extends AppLocalizations {
   @override
   String get alarmCardVacationPausedBadge => 'Dijeda karena liburan';
 
+  @override
+  String get alarmCardSchedulingFailedMessage =>
+      'Alarm ini tidak dapat didaftarkan ke sistem, sehingga mungkin tidak berbunyi.';
+
+  @override
+  String get alarmCardPreNoticeFailedMessage =>
+      'Alarm ini sudah dijadwalkan, tetapi pengingat awalnya tidak dapat diatur.';
+
   @override
   String get alarmDiagnosticsExactAlarmsTitle => 'Penjadwalan alarm presisi';
 

lib/l10n/gen/app_localizations_it.dart

@@ -1715,6 +1715,14 @@ class AppLocalizationsIt extends AppLocalizations {
   @override
   String get alarmCardVacationPausedBadge => 'In pausa per le vacanze';
 
+  @override
+  String get alarmCardSchedulingFailedMessage =>
+      'Questa sveglia non è stata registrata nel sistema, quindi potrebbe non suonare.';
+
+  @override
+  String get alarmCardPreNoticeFailedMessage =>
+      'Questa sveglia è programmata, ma non è stato possibile impostare il promemoria anticipato.';
+
   @override
   String get alarmDiagnosticsExactAlarmsTitle =>
       'Programmazione sveglia esatta';

lib/l10n/gen/app_localizations_ja.dart

@@ -1646,6 +1646,14 @@ class AppLocalizationsJa extends AppLocalizations {
   @override
   String get alarmCardVacationPausedBadge => '休暇のため一時停止中';
 
+  @override
+  String get alarmCardSchedulingFailedMessage =>
+      'このアラームはシステムに登録できなかったため、鳴らない可能性があります。';
+
+  @override
+  String get alarmCardPreNoticeFailedMessage =>
+      'このアラームは設定されていますが、事前通知を設定できませんでした。';
+
   @override
   String get alarmDiagnosticsExactAlarmsTitle => '正確なアラームのスケジュール設定';
 

lib/l10n/gen/app_localizations_pt.dart

@@ -1703,6 +1703,14 @@ class AppLocalizationsPt extends AppLocalizations {
   @override
   String get alarmCardVacationPausedBadge => 'Pausada por férias';
 
+  @override
+  String get alarmCardSchedulingFailedMessage =>
+      'Este alarme não pôde ser registrado no sistema, por isso pode não tocar.';
+
+  @override
+  String get alarmCardPreNoticeFailedMessage =>
+      'Este alarme está agendado, mas seu aviso antecipado não pôde ser configurado.';
+
   @override
   String get alarmDiagnosticsExactAlarmsTitle => 'Agendamento exato do alarme';
 

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';

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';
 

lib/pantallas/pantalla_alarmas.dart

@@ -286,6 +286,20 @@ class _TarjetaAlarma extends StatelessWidget {
       if (pausadaPorVacaciones) l10n.alarmCardVacationPausedBadge,
     ];
 
+    // fix/alarmas-fallos-silenciosos: `ultimaExcepcionPara` existed but was
+    // never read from any screen, so a failed native scheduling attempt (main
+    // alarm, pre-notice, foreground service, or a post-boot reschedule)
+    // rendered exactly like a healthy alarm -- switched on, no visible sign
+    // anything was wrong. `_esValida` only ever treats `tipoSaltoSiguiente`
+    // as a real skip, so any OTHER tipo found here is a reliability failure,
+    // never a deliberate user action.
+    final ultimaExcepcion = estado.ultimaExcepcionPara(alarma.id);
+    final fallo =
+        ultimaExcepcion != null &&
+                ExcepcionAlarma.tiposFallo.contains(ultimaExcepcion.tipo)
+            ? ultimaExcepcion
+            : null;
+
     return Dismissible(
       key: ValueKey('tarjeta-alarma-${alarma.id}'),
       direction: DismissDirection.horizontal,
@@ -417,6 +431,14 @@ class _TarjetaAlarma extends StatelessWidget {
                             ),
                           ),
                         ],
+                        if (fallo != null) ...[
+                          const SizedBox(height: 6),
+                          _AvisoFalloProgramacion(
+                            alarmaId: alarma.id,
+                            esSoloPreaviso:
+                                fallo.tipo == ExcepcionAlarma.tipoFalloPreaviso,
+                          ),
+                        ],
                       ],
                     ),
                   ),
@@ -470,6 +492,82 @@ class _TarjetaAlarma extends StatelessWidget {
   }
 }
 
+/// Per-alarm scheduling-failure notice (fix/alarmas-fallos-silenciosos):
+/// renders INSIDE the card's own content, in its own small tap target --
+/// the surrounding card `InkWell` (tap = edit) and `Dismissible` (swipe =
+/// delete) are untouched; this inner `InkWell` only claims its own region
+/// and pushes the diagnostics screen instead of opening the editor.
+class _AvisoFalloProgramacion extends StatelessWidget {
+  const _AvisoFalloProgramacion({
+    required this.alarmaId,
+    required this.esSoloPreaviso,
+  });
+
+  final String alarmaId;
+
+  /// True when only the pre-notice reminder failed (the alarm itself is
+  /// still scheduled) -- the user's reported symptom explicitly called out
+  /// a missing pre-notice as distinct from the alarm never ringing at all,
+  /// so the message must not conflate the two.
+  final bool esSoloPreaviso;
+
+  @override
+  Widget build(BuildContext context) {
+    final l10n = AppLocalizations.of(context);
+    final color = Theme.of(context).colorScheme.error;
+    return Material(
+      type: MaterialType.transparency,
+      child: InkWell(
+        key: ValueKey('tarjeta-alarma-fallo-$alarmaId'),
+        borderRadius: BorderRadius.circular(8),
+        onTap: () => _abrirDiagnostico(context),
+        child: Padding(
+          padding: const EdgeInsets.symmetric(vertical: 2),
+          child: Row(
+            crossAxisAlignment: CrossAxisAlignment.start,
+            children: [
+              Icon(Icons.warning_amber_rounded, size: 15, color: color),
+              const SizedBox(width: 6),
+              Expanded(
+                child: Column(
+                  crossAxisAlignment: CrossAxisAlignment.start,
+                  mainAxisSize: MainAxisSize.min,
+                  children: [
+                    Text(
+                      esSoloPreaviso
+                          ? l10n.alarmCardPreNoticeFailedMessage
+                          : l10n.alarmCardSchedulingFailedMessage,
+                      style: TextStyle(
+                        fontSize: 11,
+                        fontWeight: FontWeight.w600,
+                        color: color,
+                      ),
+                    ),
+                    const SizedBox(height: 2),
+                    Text(
+                      l10n.androidReliabilityReview,
+                      style: TextStyle(
+                        fontSize: 11,
+                        fontWeight: FontWeight.w800,
+                        color: color,
+                        decoration: TextDecoration.underline,
+                      ),
+                    ),
+                  ],
+                ),
+              ),
+            ],
+          ),
+        ),
+      ),
+    );
+  }
+
+  void _abrirDiagnostico(BuildContext context) {
+    PluriPushScaffold.push(context, (_) => const PantallaDiagnosticoAlarmas());
+  }
+}
+
 /// Swipe-to-delete reveal, shown on both sides so either swipe direction
 /// works regardless of locale text direction.
 class _FondoSwipeEliminarAlarma extends StatelessWidget {

test/pantallas/pantalla_alarmas_fallo_programacion_test.dart

@@ -0,0 +1,154 @@
+import 'package:flutter/material.dart';
+import 'package:flutter_test/flutter_test.dart';
+import 'package:pluriwave/estado/estado_alarmas.dart';
+import 'package:pluriwave/estado/estado_radio.dart';
+import 'package:pluriwave/l10n/gen/app_localizations.dart';
+import 'package:pluriwave/modelos/alarma_musical.dart';
+import 'package:pluriwave/pantallas/pantalla_alarmas.dart';
+import 'package:pluriwave/pantallas/pantalla_diagnostico_alarmas.dart';
+import 'package:pluriwave/servicios/servicio_alarmas.dart';
+import 'package:provider/provider.dart';
+import 'package:shared_preferences/shared_preferences.dart';
+
+import '../helpers/fakes.dart';
+import '../helpers/fakes_alarmas.dart';
+
+/// Card-level visibility for a failed scheduling attempt (fix/alarmas-
+/// fallos-silenciosos): before this, `ultimaExcepcionPara` existed but was
+/// never read from any screen, so a failed alarm rendered exactly like a
+/// working one -- switched on, no visible sign anything was wrong.
+void main() {
+  setUp(() {
+    SharedPreferences.setMockInitialValues({});
+  });
+
+  Future<void> montarPantalla(
+    WidgetTester tester,
+    EstadoAlarmas estadoAlarmas,
+  ) async {
+    tester.view.physicalSize = const Size(1440, 3200);
+    tester.view.devicePixelRatio = 1.0;
+    addTearDown(tester.view.resetPhysicalSize);
+    addTearDown(tester.view.resetDevicePixelRatio);
+
+    final radio = EstadoRadio(
+      audio: FakeServicioAudio(),
+      favoritos: FakeServicioFavoritos(),
+      radio: FakeServicioRadio(),
+      servicioEcualizador: FakeServicioEcualizador(),
+      servicioGrabacion: FakeServicioGrabacionRadioInactiva(),
+      iniciarAutomaticamente: false,
+    );
+    addTearDown(radio.dispose);
+
+    await tester.pumpWidget(
+      MultiProvider(
+        providers: [
+          ChangeNotifierProvider<EstadoRadio>.value(value: radio),
+          ChangeNotifierProvider<EstadoAlarmas>.value(value: estadoAlarmas),
+        ],
+        child: MaterialApp(
+          locale: const Locale('es'),
+          localizationsDelegates: AppLocalizations.localizationsDelegates,
+          supportedLocales: AppLocalizations.supportedLocales,
+          home: const Scaffold(body: PantallaAlarmas()),
+        ),
+      ),
+    );
+    await tester.pump();
+    await tester.pump(const Duration(milliseconds: 100));
+  }
+
+  testWidgets(
+    'una alarma cuya programacion fallo muestra un aviso en su tarjeta',
+    (tester) async {
+      final android = FakePuertoAlarmasAndroid()..fallaProgramar = true;
+      final estadoAlarmas = EstadoAlarmas(
+        servicio: ServicioAlarmas(reloj: () => DateTime(2026, 6, 1, 6, 0)),
+        android: android,
+        iniciarAutomaticamente: false,
+      );
+      addTearDown(estadoAlarmas.dispose);
+      addTearDown(android.dispose);
+      await estadoAlarmas.guardarAlarma(
+        const AlarmaMusical(
+          id: 'r1',
+          nombre: 'Rota',
+          hora: 7,
+          minuto: 0,
+          tipoProgramacion: TipoProgramacionAlarma.diaria,
+          diasSemana: [],
+        ),
+      );
+
+      await montarPantalla(tester, estadoAlarmas);
+
+      expect(
+        find.byKey(const ValueKey('tarjeta-alarma-fallo-r1')),
+        findsOneWidget,
+      );
+    },
+  );
+
+  testWidgets(
+    'una alarma programada correctamente NO muestra el aviso de fallo',
+    (tester) async {
+      final android = FakePuertoAlarmasAndroid();
+      final estadoAlarmas = EstadoAlarmas(
+        servicio: ServicioAlarmas(reloj: () => DateTime(2026, 6, 1, 6, 0)),
+        android: android,
+        iniciarAutomaticamente: false,
+      );
+      addTearDown(estadoAlarmas.dispose);
+      addTearDown(android.dispose);
+      await estadoAlarmas.guardarAlarma(
+        const AlarmaMusical(
+          id: 'ok1',
+          nombre: 'Sana',
+          hora: 7,
+          minuto: 0,
+          tipoProgramacion: TipoProgramacionAlarma.diaria,
+          diasSemana: [],
+        ),
+      );
+
+      await montarPantalla(tester, estadoAlarmas);
+
+      expect(
+        find.byKey(const ValueKey('tarjeta-alarma-fallo-ok1')),
+        findsNothing,
+      );
+    },
+  );
+
+  testWidgets('el aviso de fallo abre la pantalla de diagnostico al tocarlo', (
+    tester,
+  ) async {
+    final android = FakePuertoAlarmasAndroid()..fallaProgramar = true;
+    final estadoAlarmas = EstadoAlarmas(
+      servicio: ServicioAlarmas(reloj: () => DateTime(2026, 6, 1, 6, 0)),
+      android: android,
+      iniciarAutomaticamente: false,
+    );
+    addTearDown(estadoAlarmas.dispose);
+    addTearDown(android.dispose);
+    await estadoAlarmas.guardarAlarma(
+      const AlarmaMusical(
+        id: 'r1',
+        nombre: 'Rota',
+        hora: 7,
+        minuto: 0,
+        tipoProgramacion: TipoProgramacionAlarma.diaria,
+        diasSemana: [],
+      ),
+    );
+
+    await montarPantalla(tester, estadoAlarmas);
+
+    await tester.tap(find.byKey(const ValueKey('tarjeta-alarma-fallo-r1')));
+    await tester.pump();
+    await tester.pump(const Duration(milliseconds: 300));
+
+    expect(find.byType(PantallaDiagnosticoAlarmas), findsOneWidget);
+  });
+}