Add local-only visitor map on about page

Author: Keyu-He

_layouts/about.liquid

@@ -72,9 +72,18 @@ layout: default
         <div class="contact-note">{{ site.contact_note }}</div>
       </div>
     {% endif %}
-
-
-
+     <!-- Visitor Analytics (local only) -->
+     {% if site.visitor_map.enabled and jekyll.environment == 'development' %}
+       <div class="visitor-analytics" style="margin-top: 1.5rem; text-align: center;">
+         <details style="margin-top: 1rem;">
+           <summary style="cursor: pointer; font-size: 1.0rem; color: #999; font-style: italic;">Visitor Map</summary>
+           <div id="admin-analytics" style="margin-top: 1rem; opacity: 0.8;">
+             <script type="text/javascript" id="mapmyvisitors" src="//mapmyvisitors.com/map.js?d=VGq-6ngx9SQOzI4uqqrGzo8741s606-66KR_dTZ9b00&cl=ffffff&w=a"></script>
+           </div>
+         </details>
+       </div>
+     {% endif %}
+ 
     {% if site.newsletter.enabled and site.footer_fixed %}
       {% include scripts/newsletter.liquid center=true %}
     {% endif %}