Remove unused header and fix fold picker

Author: vraspar

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

@@ -16,6 +16,7 @@ struct ContentView: View {
   @State private var stats: String = ""  // token generation stats
   @State private var showAlert: Bool = false
   @State private var errorMessage: String = ""
+  @State private var showFolderPicker: Bool = false  // State for folder picker sheet
 
   private let generator = GenAIGenerator()
 

mobile/examples/phi-3/ios/LocalLLM/LocalLLM/README.md

@@ -79,7 +79,6 @@ For example:
 - If you want to run on an iPhone, you must build both onnxruntime and onnxruntime-genai for arm64 and copy the appropriate files to the app's `lib` directory.
 
 The header files to copy are:
-`<ORT_MAIN_SOURCE_REPO>/onnxruntime/core/session/onnxruntime_c_api.h`,
 `<ORT_GENAI_MAIN_SOURCE_REPO>/src/ort_genai.h`,
 `<ORT_GENAI_MAIN_SOURCE_REPO>/src/ort_genai_c.h`.