fix: Update views and controllers for event image display

Update all event-related view templates and controllers to properly handle and display event images throughout the application.

🤖 Generated with [Claude Code](https://claude.com/claude-code)

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

app/views/promoter/events/show.html.erb

@@ -174,7 +174,7 @@
     <!-- Main content -->
     <div class="lg:col-span-2 space-y-6 lg:space-y-8">
       <!-- Event image -->
-      <% if @event.image.attached? %>
+      <% if @event.has_image? %>
         <div class="aspect-video bg-gray-100 rounded-2xl overflow-hidden">
           <%= image_tag @event.event_image_variant(:large), alt: @event.name, class: "w-full h-full object-cover" %>
         </div>