add breadcrumb.js component class

app/components/breadcrumb.js

+import { A } from '@ember/array';
+import Component from '@glimmer/component';
+import { tracked } from '@glimmer/tracking';
+import { action } from '@ember/object';
+
+export default class BreadcrumbComponent extends Component {
+  @tracked path = A([]);
+
+  @action
+  change(node_id) {
+  }
+}
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