Sort stages alphabetically in manage, highlight blank stage names

- Sort stages alphabetically in conference stage selection view
- Add visual indicator for stages with blank names

app/controllers/admin/conferences_controller.rb

@@ -65,7 +65,7 @@ module Admin
     end
 
     def select_relevant_stages
-      @stages = @conference.stages
+      @stages = @conference.stages.order(:name)
     end
 
     def update_relevant_stages
@@ -74,7 +74,7 @@ module Admin
       if @conference.save
         redirect_to admin_conferences_path, notice: "Relevant stages updated successfully."
       else
-        @stages = @conference.stages
+        @stages = @conference.stages.order(:name)
         render :select_relevant_stages
       end
     end

app/views/admin/conferences/select_relevant_stages.html.erb

@@ -77,6 +77,11 @@
                 <%= check_box_tag "conference[relevant_stage_ids][]", stage.id, @conference.relevant_stages.include?(stage), id: "stage_#{stage.id}", class: "h-4 w-4 text-blue-600 focus:ring-blue-500 border-gray-300 rounded" %>
                 <label for="stage_<%= stage.id %>" class="ml-3 block text-sm font-medium text-gray-700 dark:text-gray-300">
                   <%= stage.name %>
+                  <% if stage.name.blank? %>
+                    <span class="inline-flex items-center px-2 py-0.5 ml-2 rounded text-xs font-medium bg-gray-100 text-gray-800 dark:bg-gray-700 dark:text-gray-300">
+                      blank
+                    </span>
+                  <% end %>
                 </label>
               </div>
             </li>