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/app_zh.arb

@@ -468,6 +468,9 @@
   "deleteRangeTooltip": "删除范围",
   "vacationsDefaultName": "假期",
   "newVacationRangeTitle": "新的假期范围",
+  "editVacationRangeTitle": "编辑假期范围",
+  "vacationDeleteConfirmTitle": "删除假期范围？",
+  "vacationDeleteConfirmMessage": "此操作无法撤销。",
   "startField": "开始",
   "endField": "结束",
   "saveRangeAction": "保存范围",