ios: more responsive UI, especially during app start (#2942)

* ios: more responsive UI, especially during app start

* move terminal items to actor

* fix for iOS 15/16

apps/ios/Shared/Views/TerminalView.swift

@@ -22,10 +22,28 @@ struct TerminalView: View {
     @State var authorized = !UserDefaults.standard.bool(forKey: DEFAULT_PERFORM_LA)
     @State private var terminalItem: TerminalItem?
     @State private var scrolled = false
+    @State private var showing = false
 
     var body: some View {
         if authorized {
             terminalView()
+                .onAppear {
+                    if showing { return }
+                    showing = true
+                    Task {
+                        let items = await TerminalItems.shared.items()
+                        await MainActor.run {
+                            chatModel.terminalItems = items
+                            chatModel.showingTerminal = true
+                        }
+                    }
+                }
+                .onDisappear {
+                    if terminalItem == nil {
+                        chatModel.showingTerminal = false
+                        chatModel.terminalItems = []
+                    }
+                }
         } else {
             Button(action: runAuth) { Label("Unlock", systemImage: "lock") }
             .onAppear(perform: runAuth)
@@ -118,9 +136,8 @@ struct TerminalView: View {
         let cmd = ChatCommand.string(composeState.message)
         if composeState.message.starts(with: "/sql") && (!prefPerformLA || !developerTools) {
             let resp = ChatResponse.chatCmdError(user_: nil, chatError: ChatError.error(errorType: ChatErrorType.commandError(message: "Failed reading: empty")))
-            DispatchQueue.main.async {
-                ChatModel.shared.addTerminalItem(.cmd(.now, cmd))
-                ChatModel.shared.addTerminalItem(.resp(.now, resp))
+            Task {
+                await TerminalItems.shared.addCommand(.now, cmd, resp)
             }
         } else {
             DispatchQueue.global().async {

apps/ios/Shared/Views/UserSettings/SettingsView.swift

@@ -299,6 +299,10 @@ struct SettingsView: View {
             }
             .navigationTitle("Your settings")
         }
+        .onDisappear {
+            chatModel.showingTerminal = false
+            chatModel.terminalItems = []
+        }
     }
     
     private func chatDatabaseRow() -> some View {