Model improvements

Model/Player/ControlsOverlayModel.swift

@@ -0,0 +1,21 @@
+import Defaults
+import Foundation
+import SwiftUI
+
+final class ControlOverlaysModel: ObservableObject {
+    static let shared = ControlOverlaysModel()
+    @Published var presenting = false { didSet { handlePresentationChange() } }
+
+    private lazy var controls = PlayerControlsModel.shared
+    private lazy var player: PlayerModel! = PlayerModel.shared
+
+    func toggle() {
+        presenting.toggle()
+        controls.objectWillChange.send()
+    }
+
+    private func handlePresentationChange() {
+        guard let player = player else { return }
+        player.backend.setNeedsNetworkStateUpdates(presenting && Defaults[.showMPVPlaybackStats])
+    }
+}