perf: Preserve child nodes during tag name change (#8597)

Modified Neo.main.DeltaUpdates.changeNodeName to use appendChild
instead of innerHTML when moving children to the new element.
This prevents the destruction of DOM state (focus, scroll, input values)
and maintains node identity.

Author: tobiu

src/main/DeltaUpdates.mjs

@@ -126,7 +126,9 @@ class DeltaUpdates extends Base {
                 clone.setAttribute(attribute.nodeName, attribute.nodeValue)
             }
 
-            clone.innerHTML= node.innerHTML;
+            while (node.firstChild) {
+                clone.appendChild(node.firstChild)
+            }
 
             node.parentNode.replaceChild(clone, node)
         }