feat(block1): variety detail + edit screen with reactive lots

Tapping an inventory item now opens its detail (the /variety/:id route was a
placeholder). Read + edit one variety end-to-end:

- Detail view: photo, category, "also known as" names, notes and lots, driven
  by a reactive VarietyDetailCubit.
- Edit core fields (label/category/notes, LWW) via a bottom sheet.
- Add a lot (harvest year + quantity) — the list refreshes reactively.
- Soft-delete (tombstone) with a confirm dialog.

Repository:
- watchVariety(id): merges Drift table-change streams (variety, lots, names,
  attachments) via StreamGroup and reloads the full detail on any change, so a
  lot added to a *different* table still refreshes the view.
- updateVariety (LWW), addLot, softDeleteVariety.

i18n: detail/edit/addLot strings (ES/EN); switched slang to {param} braces
interpolation (translator- and Weblate-friendly).

Tests: repository (reactive watchVariety, update, soft-delete) and widget tests
(render, edit updates title, add-lot appears, delete shows not-found). Full
suite green: 23 passing, 1 skipped (SQLCipher-only encryption guard).

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

@@ -41,8 +41,12 @@ class Translations with BaseTranslations<AppLocale, Translations> {
 
 	// Translations
 	late final Translations$app$en app = Translations$app$en.internal(_root);
+	late final Translations$common$en common = Translations$common$en.internal(_root);
 	late final Translations$inventory$en inventory = Translations$inventory$en.internal(_root);
 	late final Translations$quickAdd$en quickAdd = Translations$quickAdd$en.internal(_root);
+	late final Translations$detail$en detail = Translations$detail$en.internal(_root);
+	late final Translations$editVariety$en editVariety = Translations$editVariety$en.internal(_root);
+	late final Translations$addLot$en addLot = Translations$addLot$en.internal(_root);
 	late final Translations$quantityKind$en quantityKind = Translations$quantityKind$en.internal(_root);
 }
 
@@ -58,6 +62,27 @@ class Translations$app$en {
 	String get title => 'Tanemaki';
 }
 
+// Path: common
+class Translations$common$en {
+	Translations$common$en.internal(this._root);
+
+	final Translations _root; // ignore: unused_field
+
+	// Translations
+
+	/// en: 'Save'
+	String get save => 'Save';
+
+	/// en: 'Cancel'
+	String get cancel => 'Cancel';
+
+	/// en: 'Delete'
+	String get delete => 'Delete';
+
+	/// en: 'Edit'
+	String get edit => 'Edit';
+}
+
 // Path: inventory
 class Translations$inventory$en {
 	Translations$inventory$en.internal(this._root);
@@ -112,6 +137,81 @@ class Translations$quickAdd$en {
 	String get cancel => 'Cancel';
 }
 
+// Path: detail
+class Translations$detail$en {
+	Translations$detail$en.internal(this._root);
+
+	final Translations _root; // ignore: unused_field
+
+	// Translations
+
+	/// en: 'This seed is no longer here.'
+	String get notFound => 'This seed is no longer here.';
+
+	/// en: 'Lots'
+	String get lots => 'Lots';
+
+	/// en: 'No lots yet.'
+	String get noLots => 'No lots yet.';
+
+	/// en: 'Also known as'
+	String get names => 'Also known as';
+
+	/// en: 'Notes'
+	String get notes => 'Notes';
+
+	/// en: 'Add lot'
+	String get addLot => 'Add lot';
+
+	/// en: 'Delete this seed?'
+	String get deleteConfirm => 'Delete this seed?';
+
+	/// en: 'Year {year}'
+	String year({required Object year}) => 'Year ${year}';
+
+	/// en: 'Year unknown'
+	String get noYear => 'Year unknown';
+}
+
+// Path: editVariety
+class Translations$editVariety$en {
+	Translations$editVariety$en.internal(this._root);
+
+	final Translations _root; // ignore: unused_field
+
+	// Translations
+
+	/// en: 'Edit seed'
+	String get title => 'Edit seed';
+
+	/// en: 'Name'
+	String get name => 'Name';
+
+	/// en: 'Category'
+	String get category => 'Category';
+
+	/// en: 'Notes'
+	String get notes => 'Notes';
+}
+
+// Path: addLot
+class Translations$addLot$en {
+	Translations$addLot$en.internal(this._root);
+
+	final Translations _root; // ignore: unused_field
+
+	// Translations
+
+	/// en: 'Add lot'
+	String get title => 'Add lot';
+
+	/// en: 'Harvest year'
+	String get year => 'Harvest year';
+
+	/// en: 'Quantity'
+	String get quantity => 'Quantity';
+}
+
 // Path: quantityKind
 class Translations$quantityKind$en {
 	Translations$quantityKind$en.internal(this._root);
@@ -184,6 +284,10 @@ extension on Translations {
 	dynamic _flatMapFunction(String path) {
 		return switch (path) {
 			'app.title' => 'Tanemaki',
+			'common.save' => 'Save',
+			'common.cancel' => 'Cancel',
+			'common.delete' => 'Delete',
+			'common.edit' => 'Edit',
 			'inventory.title' => 'Inventory',
 			'inventory.searchHint' => 'Search seeds',
 			'inventory.empty' => 'No seeds yet. Tap + to add your first.',
@@ -196,6 +300,22 @@ extension on Translations {
 			'quickAdd.more' => 'Add more…',
 			'quickAdd.save' => 'Save',
 			'quickAdd.cancel' => 'Cancel',
+			'detail.notFound' => 'This seed is no longer here.',
+			'detail.lots' => 'Lots',
+			'detail.noLots' => 'No lots yet.',
+			'detail.names' => 'Also known as',
+			'detail.notes' => 'Notes',
+			'detail.addLot' => 'Add lot',
+			'detail.deleteConfirm' => 'Delete this seed?',
+			'detail.year' => ({required Object year}) => 'Year ${year}',
+			'detail.noYear' => 'Year unknown',
+			'editVariety.title' => 'Edit seed',
+			'editVariety.name' => 'Name',
+			'editVariety.category' => 'Category',
+			'editVariety.notes' => 'Notes',
+			'addLot.title' => 'Add lot',
+			'addLot.year' => 'Harvest year',
+			'addLot.quantity' => 'Quantity',
 			'quantityKind.aFew' => 'a few',
 			'quantityKind.some' => 'some',
 			'quantityKind.plenty' => 'plenty',