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/pages/home.html.erb

@@ -89,7 +89,7 @@
               <div class="bg-white rounded-2xl shadow-lg hover:shadow-2xl transition-all duration-300 overflow-hidden">
                 <!-- Event Image -->
                 <div class="relative overflow-hidden aspect-[4/3]">
-                  <% if event.image.attached? %>
+                  <% if event.has_image? %>
                     <%= image_tag event.event_image_variant(:medium), alt: event.name, class: "w-full h-full object-cover group-hover:scale-105 transition-transform duration-300" %>
                   <% else %>
                     <div class="w-full h-full bg-gradient-to-br from-purple-600 to-blue-600 flex items-center justify-center">