RFR: 8391: Dark theme support for dials

[Marcus Hirt]

Dark mode for the JMC console dials.

![image](https://github.com/user-attachments/assets/869020a3-b714-4672-918b-07bccbf5c72e)

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Commit messages:
 - 8391: Dark mode for JMC dials

Changes: https://git.openjdk.org/jmc/pull/644/files
  Webrev: https://webrevs.openjdk.org/?repo=jmc&pr=644&range=00
  Issue: https://bugs.openjdk.org/browse/JMC-8391
  Stats: 87 lines in 11 files changed: 72 ins; 1 del; 14 mod
  Patch: https://git.openjdk.org/jmc/pull/644.diff
  Fetch: git fetch https://git.openjdk.org/jmc.git pull/644/head:pull/644

PR: https://git.openjdk.org/jmc/pull/644