feat(inventory): editable vernacular (common) names

The "also known as" names were read-only; now they can be added and removed:
- Repository: addVernacularName + removeVernacularName (soft delete);
  VarietyDetail.vernacularNames carries ids (new VernacularName model).
- Cubit: addVernacularName / removeVernacularName.
- Detail: deletable name chips + an "Add name" chip opening a small dialog;
  the section is always visible so names can be added when empty.

Tests: repo add/remove + widget add/remove. 44 green.

apps/app_seeds/lib/i18n/es.i18n.json

@@ -30,6 +30,7 @@
     "lots": "Lotes",
     "noLots": "Aún no hay lotes.",
     "names": "También conocida como",
+    "addName": "Añadir nombre",
     "notes": "Notas",
     "addLot": "Añadir lote",
     "editLot": "Editar lote",