feat(alarmas): replace one-line reliability button with full diagnostics screen

Surface all six DiagnosticoAlarmasAndroid fields instead of three: the
battery-optimization exemption and native pending-alarm count were
already collected but silently dropped by the old widget. Each failing
signal now offers a "Fix this" action that opens the right system
settings screen (exact alarms, notifications, full-screen intent,
battery optimization), guarded by SDK level and never crashing when a
ROM lacks that screen. Manufacturers known for aggressive background
killing (Xiaomi/Redmi/POCO, Huawei, Oppo, Vivo, OnePlus, Samsung) get
an honest explanation that Autostart must be enabled manually, since
there is no API to detect or grant it.

Notifications now deep-links straight to
ACTION_APP_NOTIFICATION_SETTINGS via a new openNotificationSettings
native method, instead of reusing the runtime permission popup meant
for first-time alarm creation.

New copy is added to all 13 ARB locales with real per-language
translations (not Spanish copies), verified by the ARB parity and
anti-copy tests plus the corruption scanner.

lib/pantallas/pantalla_alarmas.dart

@@ -18,6 +18,7 @@ import '../widgets/pluri_layout.dart';
 import '../widgets/pluri_push_scaffold.dart';
 import '../widgets/pluri_root_header.dart';
 import '../widgets/pluri_sleep_timer_sheet.dart';
+import 'pantalla_diagnostico_alarmas.dart';
 import 'pantalla_vacaciones.dart';
 
 class PantallaAlarmas extends StatelessWidget {
@@ -340,8 +341,7 @@ class _TarjetaAlarma extends StatelessWidget {
                                 style: TextStyle(
                                   fontSize: 12,
                                   fontWeight: FontWeight.w700,
-                                  color: Theme.of(context).colorScheme
-                                      .onSurface
+                                  color: Theme.of(context).colorScheme.onSurface
                                       .withValues(alpha: 0.5),
                                 ),
                               ),
@@ -404,7 +404,9 @@ class _TarjetaAlarma extends StatelessWidget {
                           const SizedBox(height: 3),
                           Text(
                             detalles.join(' · '),
-                            key: ValueKey('tarjeta-alarma-detalles-${alarma.id}'),
+                            key: ValueKey(
+                              'tarjeta-alarma-detalles-${alarma.id}',
+                            ),
                             overflow: TextOverflow.ellipsis,
                             style: TextStyle(
                               fontSize: 11,
@@ -1337,6 +1339,16 @@ class _SelectorEmisoraSheetState extends State<_SelectorEmisoraSheet> {
   }
 }
 
+/// Entry point into the full Android alarm-reliability diagnostics screen
+/// (fix/alarmas-fiabilidad). Was a one-line `TextButton.icon` that only ever
+/// surfaced 3 of the 6 fields `DiagnosticoAlarmasAndroid` collects (exact
+/// alarms, notifications, full-screen intent) and cycled all three
+/// permission requests on a single tap; the two most diagnostic fields --
+/// battery-optimization exemption and the native pending-alarm count, which
+/// tells the user whether the alarm ever reached the OS at all -- were
+/// gathered and never shown. Now a tap target row (mirrors
+/// `_PanelVacaciones`'s shape) pushing `PantallaDiagnosticoAlarmas`, which
+/// shows every signal individually with its own fix action.
 class _AccesoDiagnostico extends StatelessWidget {
   const _AccesoDiagnostico({required this.estado});
 
@@ -1345,47 +1357,37 @@ class _AccesoDiagnostico extends StatelessWidget {
   @override
   Widget build(BuildContext context) {
     final l10n = AppLocalizations.of(context);
-    final diag = estado.diagnostico;
-    final exactStatus =
-        diag?.puedeProgramarExactas == true
-            ? l10n.statusOk
-            : l10n.statusPending;
-    final notificationStatus =
-        diag?.notificacionesPermitidas == true
-            ? l10n.statusOk
-            : l10n.statusPending;
-    final screenStatus =
-        diag?.puedeUsarPantallaCompleta == true
-            ? l10n.statusOk
-            : l10n.statusPending;
-    return TextButton.icon(
-      icon: const _AssetIcon(
-        'assets/icons/alarmas/android_reliability.png',
-        size: 28,
-      ),
-      label: Text(
-        diag == null
-            ? l10n.androidReliabilityTitle
-            : l10n.androidReliabilityStatus(
-              exactStatus,
-              notificationStatus,
-              screenStatus,
+    final tokens = context.pluriTokens;
+    return PluriGlassSurface(
+      padding: EdgeInsets.zero,
+      child: Material(
+        type: MaterialType.transparency,
+        child: InkWell(
+          key: const ValueKey('diagnostico-alarmas-resumen'),
+          borderRadius: BorderRadius.circular(tokens.radiusMd),
+          onTap: () => _abrirDiagnostico(context),
+          child: Padding(
+            padding: const EdgeInsets.all(16),
+            child: Row(
+              children: [
+                const _AssetIcon(
+                  'assets/icons/alarmas/android_reliability.png',
+                  size: 28,
+                ),
+                const SizedBox(width: 10),
+                Expanded(child: Text(l10n.androidReliabilityReview)),
+                const Icon(Icons.chevron_right_rounded),
+              ],
             ),
+          ),
+        ),
       ),
-      onPressed: () async {
-        if (diag != null && !diag.puedeProgramarExactas) {
-          await estado.android.solicitarPermisoAlarmasExactas();
-        }
-        if (diag != null && !diag.notificacionesPermitidas) {
-          await estado.android.solicitarPermisoNotificaciones();
-        }
-        if (diag != null && !diag.puedeUsarPantallaCompleta) {
-          await estado.android.solicitarPermisoPantallaCompleta();
-        }
-        await estado.cargarDiagnostico();
-      },
     );
   }
+
+  void _abrirDiagnostico(BuildContext context) {
+    PluriPushScaffold.push(context, (_) => const PantallaDiagnosticoAlarmas());
+  }
 }
 
 /// Vacation summary row (alarm-vacation-ranges delta, WU8): replaces the old