fix: handle nil safely for latest arts image

- Update image tag to safely access the first latest art
- Use safe navigation operator to prevent potential nil errors

This change ensures that if there are no latest arts or if the
image is not attached, the application will not raise an error.
It improves the robustness of the view by handling edge cases.

app/views/home/index.html.erb

@@ -3,7 +3,7 @@
   <section class="h-screen-90 relative overflow-hidden">
     <% if @latest_arts.first&.image&.attached? %>
       <div class="absolute inset-0">
-        <%= image_tag @latest_arts.first.webp_image.processed, class: "w-full h-full object-cover" %>
+        <%= image_tag @latest_arts&.first&.webp_image&.processed, class: "w-full h-full object-cover" %>
         <div class="absolute inset-0 bg-gradient-to-r from-base-100/90 to-base-100/50"></div>
       </div>
     <% end %>