RFR: 8367370: Accent color platform preference not updating in macOS 26 (Tahoe)

[Martin Fox]

On Wed, 10 Sep 2025 23:10:22 GMT, Michael Strauß <mstrauss at openjdk.org> wrote:

> 1. Replace undocumented `AppleColorPreferencesChangedNotification` with `NSSystemColorsDidChangeNotification`.
> 2. Replace undocumented `AppleInterfaceThemeChangedNotification` with a KVO registration for `NSApp.effectiveAppearance`.
> 
> This fix can be tested using either PlatformPreferencesChangedTest, or Monkey Tester > Tools > Platform preferences monitor.

Changes look fine to me and are working on macOS 13, 15, and 26.

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Marked as reviewed by mfox (Committer).

PR Review: https://git.openjdk.org/jfx/pull/1895#pullrequestreview-3231952501