Update 'src/index.html'

Fixed id="messages1" to id="messages" (used by src/app/core/application/header-menu.js!onFileChanged())

src/index.html

@@ -43,7 +43,7 @@
                 </ul>
               </li>
               <li><button class="level-1">Edit</button></li>
-              <li><span class="level-1" id="messages1">iGeomJS version 2025/03/20</span></li><!-- to be used to launch messages: -->              
+              <li><span class="level-1" id="messages">iGeomJS version 2025/03/20</span></li><!-- to be used to launch messages: -->              
             </ul>
           </div>
           <div class="p-1 flex-fill center">