The window-level `overrideUserInterfaceStyle` applied by
`set_system_ui_visibility` pins the WKWebView's trait collection, so the
`prefers-color-scheme` media query never fires while the app stays
foregrounded and `get_system_color_scheme` returned the stale pinned
value. Detect appearance at the window-scene level instead — it sits
above the per-window override — and push changes to JS via
`window.onNativeColorSchemeChange`.
Co-authored-by: Claude Opus 4.7 (1M context) <noreply@anthropic.com>
Huang Xin
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