RFR: 8391: Dark theme support for dials

[Brice Dutheil]

On Thu, 24 Apr 2025 23:22:32 GMT, Marcus Hirt <hirt at openjdk.org> wrote:

> Dark mode for the JMC console dials.
> 
> ![image](https://github.com/user-attachments/assets/869020a3-b714-4672-918b-07bccbf5c72e)

I believe this is OK, I don't have a strong opinion on the constructor

-------------

Marked as reviewed by bdutheil (Committer).

PR Review: https://git.openjdk.org/jmc/pull/644#pullrequestreview-2794715408