fix(vacaciones): edit and delete vacation ranges

Vacaciones ranges could be created but never edited or removed --
EstadoAlarmas already had crearRangoVacaciones/eliminarRangoVacaciones
with no UI affordance reaching them, and no update path at all.

Add EstadoAlarmas.editarRangoVacaciones and wire tap-to-edit /
swipe-to-delete (with confirmation) onto every range card, mirroring
the alarm list's own Dismissible + confirm-dialog pattern exactly. This
covers the active-range hero too: a freshly created range is active
immediately and only ever renders there, never in the
scheduled/past lists, so it needed the same affordances or a user's
very first range could never be fixed.

lib/l10n/gen/app_localizations_de.dart

@@ -1142,6 +1142,16 @@ class AppLocalizationsDe extends AppLocalizations {
   @override
   String get newVacationRangeTitle => 'Neuer Ferienzeitraum';
 
+  @override
+  String get editVacationRangeTitle => 'Ferienzeitraum bearbeiten';
+
+  @override
+  String get vacationDeleteConfirmTitle => 'Ferienzeitraum löschen?';
+
+  @override
+  String get vacationDeleteConfirmMessage =>
+      'Dies kann nicht rückgängig gemacht werden.';
+
   @override
   String get startField => 'Beginn';