Add debugging and fix form field attributes in admin modal

- Add console logging to openEditModal function to debug AJAX load
- Add explicit id and name attributes to admin select field
- Only show modal after content successfully loads
- Log errors if modal content fails to load

This helps diagnose the modal loading issue and fixes the Chrome
warning about form fields lacking id/name attributes.

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

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

app/views/admin/get_user.html.erb

@@ -34,7 +34,7 @@
 
         <div class="mb-3">
           <%= f.label :admin, nil, {:class => "form-label"}%>
-          <%= f.select(:admin, @admin_select, {}, {:class => "form-select"}) %>
+          <%= f.select(:admin, @admin_select, {}, {:class => "form-select", :id => "user_admin", :name => "user[admin]"}) %>
         </div>
     </div>
     <div class="modal-footer">