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Not electron, the theater apps just load the respective service’s regular web app. The bulk of the car’s UI is built in QT last I remember, though the newer music apps (Apple Music and the Spotify redesign) are web apps also.
Generally some of the best automotive UI, but the competition surely isn’t very strong.
You can use the left scroll wheel on your steering wheel to adjust the wipers once you’ve pressed for a single wipe. Just click it right for more, left for less. No need to look at the screen at all really. There’s a little graphic on the wiper controls showing you this.