iOS 1.0 RC 1: battery and heat work, version label, web player redraw tweaks

Co-Authored-By: Claude Opus 5.5 <noreply@anthropic.com>

ios/Stemify/CarPlay/CarPlayScene.swift

@@ -15,6 +15,7 @@ final class CarPlayScene: UIResponder, CPTemplateApplicationSceneDelegate, CPNow
 
     func templateApplicationScene(_ scene: CPTemplateApplicationScene, didConnect ic: CPInterfaceController) {
         self.ic = ic
+        AppActivity.setCar(true)
         let np = CPNowPlayingTemplate.shared
         np.isUpNextButtonEnabled = true
         np.isAlbumArtistButtonEnabled = false
@@ -33,6 +34,7 @@ final class CarPlayScene: UIResponder, CPTemplateApplicationSceneDelegate, CPNow
         messageId = nil
         CPNowPlayingTemplate.shared.remove(self)
         self.ic = nil
+        AppActivity.setCar(false)
     }
 
     // ---- browse ------------------------------------------------------------------------