Move lightbox to cards/show so we can use it for description and Lexical images

app/views/cards/display/common/_background.html.erb

@@ -1,14 +1,6 @@
 <% if card.image.present? %>
   <div class="card__background">
     <%= image_tag card.image.presence || "", size: 120, data: { upload_preview_target: "image" } %>
-    <%= render "layouts/lightbox" do %>
-      <% if card.image.attached? %>
-        <%= button_to card_image_path(card), method: :delete, class: "btn" do %>
-          <%= icon_tag "trash" %>
-          <span class="for-screen-reader">Clear background image</span>
-        <% end %>
-      <% end %>
-    <% end %>
   </div>
 
   <%= yield %>

app/views/cards/show.html.erb

@@ -49,3 +49,12 @@
     <%= render "cards/messages", card: @card %>
   <% end %>
 </div>
+
+<%= render "layouts/lightbox" do %>
+  <% if @card.image.attached? %>
+    <%= button_to card_image_path(@card), method: :delete, class: "btn" do %>
+      <%= icon_tag "trash" %>
+      <span class="for-screen-reader">Remove background image</span>
+    <% end %>
+  <% end %>
+<% end %>