no undo for split cell

[alefminus]

Describe the bug

1. Split cell using the new (awesome) shortcut Ctrl+'
2. Press Ctrl-Z

Nothing happens

Environment

{
  "marimo": "0.6.0",
  "OS": "Linux",
  "OS Version": "6.8.7-300.fc40.x86_64",
  "Processor": "",
  "Python Version": "3.12.3",
  "Binaries": {
    "Browser": "--",
    "Node": "v20.12.2"
  },
  "Requirements": {
    "click": "8.1.7",
    "importlib-resources": "missing",
    "jedi": "0.19.1",
    "markdown": "3.6",
    "pymdown-extensions": "10.8.1",
    "pygments": "2.18.0",
    "tomlkit": "0.12.5",
    "uvicorn": "0.29.0",
    "starlette": "0.37.2",
    "websocket": "missing",
    "typing-extensions": "4.11.0",
    "black": "24.4.2"
  }
}

Code to reproduce

Any cell.