I have read the docs but I'm not understanding. Here is the code I have. I removed irrelevant lines.

It works right now. My question is, how do I programmatically navigate to a ThingDetail screen with a specific Thing passed in?

When the user receives a notification that says "tap to view this thing", I want them to tap it and then have the app launch to a specific ThingDetail(thing: thing), with a back button that takes them back to the list of all the things.

// Home screen is a list of Things that you can tap on to view the ThingDetail screen

@main
struct MyApp: App {
    @FetchRequest(sortDescriptors: []) var things: FetchedResults<Thing>
    @State private var navigationPath: NavigationPath
    
    var body: some Scene {
        WindowGroup {
            NavigationStack(path: $navigationPath) {
                ScrollView {
                    VStack {
                        ForEach(things) { thing in
                            ThingCard(thing: thing)
                        }
                    }
                }
                .navigationTitle("Things")
        }
    }
}

// This is a button that has the thing name and metadata, and links to the detail screen
struct ThingCard: View {
    let thing: Thing
    
    var body: some View {
        NavigationLink (destination: ThingDetailView(thing: thing)) {
            ZStack {
                RoundedRectangle()
                Text(thing.value ?? "")
            }
        }
    }
}

// This is the screen that you see when you tap on a ThingCard in the home screen list
struct ThingDetailView: View {
    let thing: Thing
    
    var body: some View {
        Text(thing.value ?? "")
    }
}

extension MyApp: UNCDelegateDelegate {
    func handleUserOpenedNotification(completionHandler: @escaping () -> Void) {
        // If user tapped notification that said "open to view this thing". I want to show the user a ThingDetail(thing: thing)
        completionHandler()
    }
}