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/en.i18n.json

@@ -32,6 +32,7 @@
     "names": "Also known as",
     "notes": "Notes",
     "addLot": "Add lot",
+    "editLot": "Edit lot",
     "deleteConfirm": "Delete this seed?",
     "year": "Year {year}",
     "noYear": "Year unknown"

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

@@ -32,6 +32,7 @@
     "names": "También conocida como",
     "notes": "Notas",
     "addLot": "Añadir lote",
+    "editLot": "Editar lote",
     "deleteConfirm": "¿Eliminar esta semilla?",
     "year": "Año {year}",
     "noYear": "Año desconocido"

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

@@ -4,9 +4,9 @@
 /// To regenerate, run: `dart run slang`
 ///
 /// Locales: 2
-/// Strings: 182 (91 per locale)
+/// Strings: 184 (92 per locale)
 ///
-/// Built on 2026-07-08 at 08:39 UTC
+/// Built on 2026-07-08 at 09:07 UTC
 
 // coverage:ignore-file
 // ignore_for_file: type=lint, unused_import

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

@@ -168,6 +168,9 @@ class Translations$detail$en {
 	/// en: 'Add lot'
 	String get addLot => 'Add lot';
 
+	/// en: 'Edit lot'
+	String get editLot => 'Edit lot';
+
 	/// en: 'Delete this seed?'
 	String get deleteConfirm => 'Delete this seed?';
 
@@ -658,6 +661,7 @@ extension on Translations {
 			'detail.names' => 'Also known as',
 			'detail.notes' => 'Notes',
 			'detail.addLot' => 'Add lot',
+			'detail.editLot' => 'Edit lot',
 			'detail.deleteConfirm' => 'Delete this seed?',
 			'detail.year' => ({required Object year}) => 'Year ${year}',
 			'detail.noYear' => 'Year unknown',

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',