With the Jupyter AI 3.0.0a0 pre-release, I am seeing a 404 in the browser console when I create a new chat file.

Description

In spite of this 404, the chat file seems to work fine.

Reproduce

1. Start JupyterLab.
2. Open browser console.
3. Create chat file.
4. See the 404.

Expected behavior

• As a user, I don't want to see 404s in my browser console :-)

Context

I am using the following conda env:

name: jupyter-ai-testing
dependencies:
  - python
  - pip:
    - jupyterlab==4.2.5
    - jupyter-ai==3.0.0a0
    - langchain-aws