feat(inventory): edit and delete existing lots

Lots could only be created; now they can be edited and removed:
- Repository: updateLot (LWW) + softDeleteLot (tombstone).
- Cubit: updateLot / deleteLot.
- The add-lot sheet is now a shared add/edit sheet — tapping a lot opens it
  prefilled (type, year, quantity), with a trash action to delete. The reactive
  detail view refreshes on save/delete.

Tests: repo updateLot/softDeleteLot + widget edit-lot and delete-lot. 42 green.

apps/app_seeds/lib/i18n/strings_es.g.dart

@@ -118,6 +118,7 @@ class _Translations$detail$es extends Translations$detail$en {
 	@override String get names => 'También conocida como';
 	@override String get notes => 'Notas';
 	@override String get addLot => 'Añadir lote';
+	@override String get editLot => 'Editar lote';
 	@override String get deleteConfirm => '¿Eliminar esta semilla?';
 	@override String year({required Object year}) => 'Año ${year}';
 	@override String get noYear => 'Año desconocido';
@@ -474,6 +475,7 @@ extension on TranslationsEs {
 			'detail.names' => 'También conocida como',
 			'detail.notes' => 'Notas',
 			'detail.addLot' => 'Añadir lote',
+			'detail.editLot' => 'Editar lote',
 			'detail.deleteConfirm' => '¿Eliminar esta semilla?',
 			'detail.year' => ({required Object year}) => 'Año ${year}',
 			'detail.noYear' => 'Año desconocido',