Refactor chat UI and token generation logic

Author: vraspar

mobile/examples/phi-3/ios/LocalLLM/LocalLLM/ContentView.swift

@@ -1,6 +1,3 @@
-// Copyright (c) Microsoft Corporation. All rights reserved.
-// Licensed under the MIT License.
-
 import SwiftUI
 
 

mobile/examples/phi-3/ios/LocalLLM/LocalLLM/GenAIGenerator.mm

@@ -18,6 +18,9 @@ @interface GenAIGenerator () {
 
 @implementation GenAIGenerator
 
+typedef std::chrono::high_resolution_clock Clock;
+typedef std::chrono::time_point<Clock> TimePoint;
+
 typedef std::chrono::steady_clock Clock;
 typedef std::chrono::time_point<Clock> TimePoint;