* Fix dock icon not auto-switching with system dark mode
The automatic icon mode relied on the asset catalog to handle
appearance-based icon selection, but the compiled Assets.car does not
include dark variant renditions for AppIcon. This meant setting
applicationIconImage to nil had no effect — the icon stayed on the
light variant regardless of system appearance.
Replace the nil-reset approach with an active KVO observer on
NSApp.effectiveAppearance that programmatically swaps between
AppIconDark and AppIconLight images when in automatic mode.
Co-Authored-By: Claude Opus 4.6 (1M context) <noreply@anthropic.com>
* Address review feedback: fix async race and harden singleton
- Add guard in async callback to skip stale updates after stopObserving()
- Add private init() to prevent external instantiation of singleton
- Remove unused .new KVO option
Co-Authored-By: Claude Opus 4.6 (1M context) <noreply@anthropic.com>
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Co-authored-by: CHE-3 <schumannzheng@gmail.com>
Co-authored-by: Claude Opus 4.6 (1M context) <noreply@anthropic.com>
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