Create a digest opened event on iOS

apple/OmnivoreKit/Sources/App/Views/AI/FullScreenDigestView.swift

@@ -76,12 +76,17 @@ public class FullScreenDigestViewModel: ObservableObject {
       self.isRunning = digest.jobState == "RUNNING" || digest.jobState == "PENDING"
       self.hasError = digest.jobState == "FAILED"
 
-      if let playingDigest = audioController.itemAudioProperties as? DigestAudioItem, playingDigest.digest.id == digest.id {
+      if let playingDigest = audioController.itemAudioProperties as? DigestAudioItem, 
+          playingDigest.digest.id == digest.id {
         // Don't think we need to do anything here
       } else {
         let chapterData = self.chapterInfo?.map { $0.1 }
         audioController.play(itemAudioProperties: DigestAudioItem(digest: digest, chapters: chapterData ?? []))
       }
+
+      EventTracker.track(
+       .digestOpened(digestID: digest.id)
+      )
     } else {
       hasError = true
     }
@@ -200,7 +205,7 @@ struct FullScreenDigestView: View {
        await viewModel.load(dataService: dataService, audioController: audioController)
      }
   }
-  
+
   var jobRunningText: some View {
     VStack {
       Spacer()

apple/OmnivoreKit/Sources/Utils/EventTracking/TrackableEvents.swift

@@ -6,6 +6,7 @@ public enum TrackableEvent {
   case backgroundFetch(jobStatus: BackgroundFetchJobStatus, itemCount: Int, secondsElapsed: Int)
   case audioSessionStart(linkID: String, voice: String, voiceProvider: String)
   case audioSessionEnd(linkID: String, timeElapsed: Double)
+  case digestOpened(digestID: String)
 }
 
 public enum BackgroundFetchJobStatus: String {
@@ -28,6 +29,8 @@ public extension TrackableEvent {
       return "audio_session_start"
     case .audioSessionEnd:
       return "audio_session_end"
+    case .digestOpened:
+      return "digest_opened"
     }
   }
 
@@ -59,6 +62,11 @@ public extension TrackableEvent {
         "link": linkID,
         "timeElapsed": String(timeElapsed)
       ]
+    case let .digestOpened(digestID: digestID):
+      return [
+        "channel": "push",
+        "digestID": digestID
+      ]
     }
   }
 }