ios: add copy session ID to chat menu

ios/Packages/Sybil/Sources/Sybil/SybilSidebarView.swift

@@ -1,5 +1,6 @@
 import Observation
 import SwiftUI
+import UIKit
 
 struct SybilSidebarView: View {
     @Bindable var viewModel: SybilViewModel
@@ -169,7 +170,7 @@ struct SybilSidebarItemList: View {
                                     Label(item.starred ? "Unstar" : "Star", systemImage: item.starred ? "star.slash" : "star")
                                 }
 
-                                if item.kind == .chat {
+                                if case let .chat(chatID) = item.selection {
                                     Button {
                                         forkChat(item)
                                     } label: {
@@ -183,6 +184,12 @@ struct SybilSidebarItemList: View {
                                     } label: {
                                         Label("Rename", systemImage: "pencil")
                                     }
+
+                                    Button {
+                                        UIPasteboard.general.string = chatID
+                                    } label: {
+                                        Label("Copy Session ID", systemImage: "doc.on.doc")
+                                    }
                                 }
 
                                 Button(role: .destructive) {