* feat(window): working background opacity and blur on macOS, Windows and Linux
One window material model (opaque / translucent / blurred): macOS vibrancy without transparent, Windows 11 22H2+ acrylic, Linux transparent windows. Terminals paint their translucent background once, the transparent WebGL frame clears before drawing (#6491), and Reduce Visual Effects drops modal/backdrop blur and honors prefers-reduced-transparency.
* perf(window): drop hidden macOS vibrancy while a theme image covers the window
* refactor(settings): move Reduce Visual Effects into its own setting and search files
Neil
4b4c833e10