Fix ESLint errors and bugs

Co-Authored-By: Claude Opus 4.6 <noreply@anthropic.com>

src/nodeClass.js

@@ -203,12 +203,13 @@ class nodeClass {
           this.source.handleInput(msg);
           break;
           */
-        case 'registerChild':
+        case 'registerChild': {
           // Register this node as a child of the parent node
           const childId = msg.payload;
-          const childObj = this.RED.nodes.getNode(childId); 
+          const childObj = this.RED.nodes.getNode(childId);
           this.source.childRegistrationUtils.registerChild(childObj.source ,msg.positionVsParent);
           break;
+        }
       }
       done();
     });