Load CRM catalog on the storefront edit form so products can be added

The storefront editor has an 'Add from products' picker (+ per-item photo
upload), but the edit page (storefronts.show) never passed the CRM $catalog to
editor-fields, so the picker was hidden (x-show=catalog.length) — there was no
way to add products to an existing storefront. show() now loads catalogProducts()
and forwards it to the editor, matching the create form.

Co-Authored-By: Claude Opus 4.8 <noreply@anthropic.com>

app/Http/Controllers/Merchant/StorefrontController.php

@@ -128,6 +128,7 @@ class StorefrontController extends Controller
         return view('merchant.storefronts.show', [
             'qrCode' => $storefront->fresh(),
             'previewDataUri' => $this->imageGenerator->previewDataUri($storefront),
+            'catalog' => $this->catalogProducts(),
         ]);
     }