Jupyter Theme: Sync setting light or dark theme with OS setting

[kiryph]

Problem

• I'm always disappointed when JupyterLab does not automatically change from light to dark theme when it's getting late and macOS switches to the dark system theme. Almost all apps and many Websites respond to the theme change (e.g. github.com, stackoverflow.com, ...).

Here a screenshot from github.com:

Proposed Solution

• Add an option to menu Settings → Theme → “Sync with system”

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[jtpio]

Thanks @kiryph for opening this issue, it would indeed be a great feature.

It sounds similar to this one: #8777.

Let's close in favor of #8777 and continue the conversation there?