feat: add support for multiple event dates in variants

- Updated the FeaturedGroupService to include 'variants.eventDates' in the items query.
- Introduced a BelongsToMany relationship in EventDate for selected variants.
- Modified PurchaseItemResource and PurchaseItemSnapshotFactory to handle multiple event dates for variants.
- Enhanced StartCheckoutService to load event dates for variants.
- Updated TicketGeneratorService to accommodate event dates in ticket generation.
- Created migrations to support multi-value event dates and allow multiple variant values per attribute.
- Adjusted seeders to reflect new event date handling and added new attributes.
- Added tests to ensure correct functionality for multi-date variants and their integration with ticket generation.

tests/Feature/Catalog/CatalogServiceTest.php

@@ -136,6 +136,42 @@ class CatalogServiceTest extends TestCase
         );
     }
 
+    public function test_it_creates_a_variant_with_multiple_event_dates(): void
+    {
+        $eventDateAttribute = $this->createAttribute('event_date', FieldType::EventDate);
+        $firstDate = $this->tenant->eventDates()->create([
+            'date' => '2026-10-09',
+            'time_start' => '00:00:00',
+            'time_end' => '23:59:59',
+        ]);
+        $secondDate = $this->tenant->eventDates()->create([
+            'date' => '2026-10-10',
+            'time_start' => '00:00:00',
+            'time_end' => '23:59:59',
+        ]);
+
+        $item = $this->service->create([
+            'tenant_code' => $this->tenant->codigo,
+            'slug' => 'multi-date-pass',
+            'nombre' => 'Multi-date pass',
+            'precio' => 100,
+            'attribute_codes' => [$eventDateAttribute->codigo],
+            'multi_select_attribute_codes' => ['event_date'],
+            'variants' => [[
+                'real_stock' => 5,
+                'event_date_ids' => [$secondDate->id, $firstDate->id],
+            ]],
+        ]);
+
+        $variant = $item->variants->sole();
+        $this->assertNull($variant->event_date_id);
+        $this->assertSame([$firstDate->id, $secondDate->id], $variant->eventDates->pluck('id')->all());
+        $this->assertSame(
+            [(string) $firstDate->id, (string) $secondDate->id],
+            $variant->selectionValues()->get('event_date'),
+        );
+    }
+
     public function test_it_rejects_duplicate_variant_combinations(): void
     {
         $sector = $this->createAttribute('sector');