can you produce code for a navigation stack with groups and items in each group in swiftui for iPados 16
Certainly! In SwiftUI, you can create a navigation stack with groups and items using `NavigationStack` and `List`. Below is a simple example that demonstrates how to create a navigation stack with groups and items in each group for an iPadOS app.

This example includes a main view with a navigation stack, groups of items, and navigates to detail views when an item is selected.

### Example Code

```swift
import SwiftUI

struct ContentView: View {
    var body: some View {
        NavigationStack {
            List {
                Section(header: Text("Group 1")) {
                    NavigationLink(destination: DetailView(item: "Item 1A")) {
                        Text("Item 1A")
                    }
                    NavigationLink(destination: DetailView(item: "Item 1B")) {
                        Text("Item 1B")
                    }
                }
                
                Section(header: Text("Group 2")) {
                    NavigationLink(destination: DetailView(item: "Item 2A")) {
                        Text("Item 2A")
                    }
                    NavigationLink(destination: DetailView(item: "Item 2B")) {
                        Text("Item 2B")
                    }
                }
                
                Section(header: Text("Group 3")) {
                    NavigationLink(destination: DetailView(item: "Item 3A")) {
                        Text("Item 3A")
                    }
                    NavigationLink(destination: DetailView(item: "Item 3B")) {
                        Text("Item 
import SwiftUI

struct ContentView: View {
    var body: some View {
        NavigationView {
            Group {
                NavigationLink(destination: ItemView(), label: {
                    Image(systemName: "plus")
                }) {
                    Text("Add Group")
                }
            }
            .navigationBarTitle("Groups")
            .navigationBarItems(trailing:
                Group {
                    NavigationLink(destination: ItemView(), label: {
                        Image(systemName: "plus")
                    }) {
                        Text("Add Item")
                    }
                }
            )
        }
    }
}

struct ItemView: View {
    var body: some View {
        Text("Item")
    }
}