Dashboard: don't rebuild html if config data hasn't changed

.serena/project.yml

@@ -60,5 +60,6 @@ initial_prompt: ""
 project_name: "serena"
 languages:
 - python
+- typescript
 included_optional_tools: []
 encoding: utf-8

src/serena/resources/dashboard/index.html

@@ -298,7 +298,7 @@
     <div id="edit-serena-config-modal" class="modal" style="display:none">
         <div class="modal-content modal-content-large">
             <span class="modal-close modal-close-edit-serena-config">&times;</span>
-            <h3 style="margin-bottom: 10px;">Serena Configuration</h3>
+            <h3 style="margin-bottom: 10px;">Global Serena Configuration</h3>
             <p style="margin: 10px 0 20px 0; color: var(--text-muted); font-size: 13px; line-height: 1.5;">
                 Note: Changes to the configuration will only take effect after Serena is restarted.
             </p>