fix: address code review comments

- vite.config.ts: fix __dirname for ESM, add 1MB payload limit + JSON validation
- MapViewer.tsx: remove broken window.isTransforming checks, fix callback order
- EditorPage.tsx: derive undoCount from historyManager in handleTransformEnd
- package.json: support Node 20 or 22 in engines

src/components/editor/EditorPage.tsx

@@ -252,8 +252,6 @@ export function EditorPage(): React.JSX.Element {
         newMapNodes[nodeIndex] = updatedNode;
         return { ...prev, mapNodes: newMapNodes };
       });
-      setUndoCount((prev) => prev + 1);
-      console.log("Node transformed:", nodeIndex);
     },
     [sceneData],
   );