DuckPlayer: 31. Native PoC - Limit to iPhone (#3925)

Task/Issue URL: https://app.asana.com/0/0/1209317514439765/f
Tech Design URL:
CC:

**Description**:
- Limit the PoC to iPhone

DuckDuckGo/DuckPlayer/DuckPlayerSettings.swift

@@ -191,12 +191,12 @@ final class DuckPlayerSettingsDefault: DuckPlayerSettings {
 
     // Determines if we should use the native verion of DuckPlayer (Internal only)
     var nativeUI: Bool {
-        return appSettings.duckPlayerNativeUI && internalUserDecider.isInternalUser
+        return appSettings.duckPlayerNativeUI && internalUserDecider.isInternalUser && UIDevice.current.userInterfaceIdiom == .phone
     }
 
     // Determines if we should use the native verion of DuckPlayer (Internal only)
     var autoplay: Bool {
-        return appSettings.duckPlayerAutoplay && internalUserDecider.isInternalUser
+        return appSettings.duckPlayerAutoplay && internalUserDecider.isInternalUser && UIDevice.current.userInterfaceIdiom == .phone
     }
 
     /// Registers a publisher to listen for changes in the privacy configuration.

DuckDuckGo/SettingsDuckPlayerView.swift

@@ -82,7 +82,7 @@ struct SettingsDuckPlayerView: View {
             }
 
             /// Experimental features for internal users
-            if viewModel.isInternalUser {
+            if viewModel.isInternalUser && UIDevice.current.userInterfaceIdiom == .phone {
                 Section("Experimental (Internal only)", content: {
                     SettingsCellView(label: "Use Native UI (Alpha)", accessory: .toggle(isOn: viewModel.duckPlayerNativeUI))
                     if viewModel.appSettings.duckPlayerNativeUI {