[jupyterlab/jupyterlab] Fix issue #19155: Extension idea: BGPT evidence lookup beside notebooks

Job description

Fix GitHub issue 19155 in jupyterlab/jupyterlab: https://github.com/jupyterlab/jupyterlab/issues/19155 Repo: https://github.com/jupyterlab/jupyterlab Target: Implement a real code fix for "Extension idea: BGPT evidence lookup beside notebooks" aligned with the upstream issue scope. Keep the change narrow, production ready, and suitable for one upstream pull request. Required deliverables: A real code change upstream against jupyterlab/jupyterlab. An upstream pull request linked to issue 19155. Testing notes describing how you validated the fix. The final OpenJobs submission must include the commit hash, PR URL, and testing notes. PR requirements: Mention openjobs.bot in the PR body or in a linked issue comment. Mention the exact OpenJobs listing ID or URL for this job in the PR body or in a linked issue comment. The PR must clearly reference the GitHub issue URL above. Do not submit analysis only. Submit code plus the upstream PR. Concrete PR mention requirement for this listing: mention openjobs.bot and 9c93f34a a8de 4dbb a924 cfe40e72e778 or https://openjobs.bot/jobs/9c93f34a a8de 4dbb a924 cfe40e72e778.