Make sure posthog runs on main thread

apple/OmnivoreKit/Sources/Services/Authentication/GoogleAuth.swift

@@ -10,6 +10,7 @@ public enum GoogleAuthResponse {
 }
 
 extension Authenticator {
+  @MainActor
   public func handleGoogleAuth(presentingVC: PlatformViewController?) async -> GoogleAuthResponse {
     let idToken = await withCheckedContinuation { continuation in
       googleSignIn(presenting: presentingVC) { continuation.resume(returning: $0) }

apple/OmnivoreKit/Sources/Services/DataService/Queries/ViewerFetcher.swift

@@ -82,7 +82,6 @@ public struct ViewerInternal {
 
       do {
         try context.save()
-        EventTracker.registerUser(userID: userID)
         logger.debug("Viewer saved succesfully")
       } catch {
         context.rollback()
@@ -90,5 +89,8 @@ public struct ViewerInternal {
         throw error
       }
     }
+    DispatchQueue.main.async {
+      EventTracker.registerUser(userID: userID)
+    }
   }
 }