fix: order bulk-delete had zero confirmation

Bulk-delete button called facade.applyBulkDelete() with no gate.
Added app-confirm-dialog, same pattern as products/categories.

Co-Authored-By: Claude Sonnet 5 <noreply@anthropic.com>

src/app/i18n/en.ts

@@ -1360,6 +1360,8 @@ export const en: Translations = {
     },
   },
   adminOrders: {
+    bulkDeleteTitle: 'Delete orders',
+    confirmBulkDelete: 'Delete the selected orders? This cannot be undone.',
     back: 'Back to orders',
     search: 'Search by order number, name, email, or phone…',
     export: 'Export',