fix: add eager loading for product images in BrandController

Fixes lazy loading violation on Product.images relation which was
causing BrandDashboardTest failures. Added `with('images')` eager
loading in both the dashboard method and calculateBrandInsights.

app/Http/Controllers/Seller/BrandController.php

@@ -145,8 +145,8 @@ class BrandController extends Controller
     {
         $this->authorize('view', [$brand, $business]);
 
-        // Load relationships
-        $brand->load(['business', 'products']);
+        // Load relationships (include images to avoid lazy loading in view)
+        $brand->load(['business', 'products.images']);
 
         // Get stats data for Analytics tab (default to this month)
         $preset = $request->input('preset', 'this_month');
@@ -1721,7 +1721,8 @@ class BrandController extends Controller
      */
     private function calculateBrandInsights(Brand $brand, Business $business, $startDate, $endDate): array
     {
-        $products = $brand->products;
+        // Eager load images to avoid N+1 and lazy loading errors
+        $products = $brand->products()->with('images')->get();
 
         // Top Performer - product with highest revenue in date range
         $topPerformer = null;