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

[Michael Strauß]

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.

I think this fix should be backported to jfx25u.

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PR Comment: https://git.openjdk.org/jfx/pull/1895#issuecomment-3320493147