chore: expose appearance preference #7170
Draft
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What does this PR do?
We have four PRs in review for light mode, and hopefully only a few more until it still has issues but might be ready for experimental support/early feedback. It takes longer to test because the preference is hidden.
Creating this draft PR to make it easy to apply and test, and so that it's ready when the time comes.
Screenshot / video of UI
What issues does this PR fix or reference?
N/A
How to test this PR?
Just confirm the setting is visible, and appearance changes when you change it.