feat(quick-add): save & add another for rapid manual entry

The quick-add sheet no longer closes on every save: a new 'Save & add
another' action saves the seed, clears the form (keeping the chosen lot
type), refocuses the name field and shows an 'N added' running count, so
a whole shelf can be entered without reopening the sheet each time.
Plain Save still closes it. Adds a dedicated label field with its own
controller, submitAndAddAnother() on the cubit, and cubit + widget tests.

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

@@ -401,6 +401,12 @@ class Translations$quickAdd$en {
 	/// en: 'Save'
 	String get save => 'Save';
 
+	/// en: 'Save & add another'
+	String get saveAndAddAnother => 'Save & add another';
+
+	/// en: '{n} added'
+	String addedCount({required Object n}) => '${n} added';
+
 	/// en: 'Cancel'
 	String get cancel => 'Cancel';
 }
@@ -1217,6 +1223,8 @@ extension on Translations {
 			'quickAdd.quantity' => 'How much?',
 			'quickAdd.more' => 'Add more…',
 			'quickAdd.save' => 'Save',
+			'quickAdd.saveAndAddAnother' => 'Save & add another',
+			'quickAdd.addedCount' => ({required Object n}) => '${n} added',
 			'quickAdd.cancel' => 'Cancel',
 			'detail.notFound' => 'This seed is no longer here.',
 			'detail.lots' => 'Lots',