fix: Various editor / diagnostic improvements (#2363)

- Closes: #2360 
 - Closes: #2328

src/utils/event-ancestor.ts

@@ -0,0 +1,21 @@
+/**
+ * Walk up `element`'s ancestor chain (through shadow boundaries) looking for
+ * an ancestor with the given tag name. Returns true if one is found and that
+ * same element also appears in the event's composedPath — indicating the event
+ * originated from within the same subtree as the element.
+ */
+export const isAncestorInEventPath = (
+  element: Element,
+  ev: Event,
+  tagName: string,
+): boolean => {
+  const composedPath = ev.composedPath();
+  let node: Node | null = element;
+  while (node) {
+    if (node instanceof Element && node.tagName.toLowerCase() === tagName) {
+      return composedPath.includes(node);
+    }
+    node = node instanceof ShadowRoot ? node.host : node.parentNode;
+  }
+  return false;
+};