finish implementation for iOS

App/Settings/AddSearchEngineViewController.swift

@@ -0,0 +1,74 @@
+//
+//  AddSearchEngineViewController.swift
+//  App
+//
+//  Created by James Magahern on 9/29/25.
+//
+
+import SwiftUI
+import UIKit
+
+@MainActor
+struct AddSearchEngineView: View
+{
+    @State var model: ViewModel
+
+    var body: some View {
+        Form {
+            Section {
+                HStack {
+                    Text("Name")
+                    TextField("Name", text: $model.name)
+                        .multilineTextAlignment(.trailing)
+                        .autocorrectionDisabled()
+                }
+            }
+
+            Section {
+                HStack {
+                    Text("URL")
+                    TextField("https://example.com/query=%q", text: $model.url)
+                        .multilineTextAlignment(.trailing)
+                        .autocorrectionDisabled()
+                        .textContentType(.none)
+                }
+            } footer: {
+                Text("URL must contain %q, which will be replaced by the query. ")
+            }
+
+            Section {
+                Toggle("Set as default", isOn: $model.makeDefault)
+            }
+        }
+        .navigationTitle("Add Search Engine")
+    }
+
+    @MainActor
+    @Observable
+    class ViewModel
+    {
+        var name: String = ""
+        var url: String = ""
+        var makeDefault: Bool = false
+    }
+}
+
+@MainActor
+class AddSearchEngineViewController: UIHostingController<AddSearchEngineView>
+{
+    public var viewModel: AddSearchEngineView.ViewModel
+
+    init() {
+        self.viewModel = AddSearchEngineView.ViewModel()
+        super.init(rootView: AddSearchEngineView(model: viewModel))
+    }
+    
+    @MainActor @preconcurrency required dynamic init?(coder aDecoder: NSCoder) {
+        fatalError("init(coder:) has not been implemented")
+    }
+}
+
+#Preview {
+    @Previewable @State var model = AddSearchEngineView.ViewModel()
+    AddSearchEngineView(model: model)
+}