Behaviors with Blueprint-style node graph, graph editor tab and BehaviorSystem

Co-Authored-By: Claude Fable 5.1 <noreply@anthropic.com>

src/ui/widgets/ListView.ts

@@ -25,7 +25,7 @@ export class ListView extends Widget {
   onSelect?: (id: string | null) => void;
   onActivate?: (id: string) => void;
   onContextMenu?: (id: string, globalX: number, globalY: number) => void;
-  rowHeight = Theme.rowHeight;
+  rowHeight: number = Theme.rowHeight;
   emptyText = 'Nothing here yet';
   private readonly emptyLabel = new Text({ text: '', style: textStyle('muted') });