chore: scaffold Voice iOS app (Phase 0)

XcodeGen project, SwiftUI iOS 17 target dev.shane.voice, SPM
livekit-client-swift 2.16.0, mic usage + ATS LAN exception in
Info.plist, placeholder conversation screen and Settings with
server URL field.

Sources/App/SettingsStore.swift

@@ -0,0 +1,41 @@
+import Foundation
+import Combine
+
+final class SettingsStore: ObservableObject {
+    @Published var serverURL: String {
+        didSet { UserDefaults.standard.set(serverURL, forKey: Keys.serverURL) }
+    }
+    @Published var voiceID: String {
+        didSet { UserDefaults.standard.set(voiceID, forKey: Keys.voiceID) }
+    }
+    @Published var modelID: String? {
+        didSet { UserDefaults.standard.set(modelID, forKey: Keys.modelID) }
+    }
+    @Published var textMode: Bool {
+        didSet { UserDefaults.standard.set(textMode, forKey: Keys.textMode) }
+    }
+    @Published var volume: Double {
+        didSet { UserDefaults.standard.set(volume, forKey: Keys.volume) }
+    }
+
+    private enum Keys {
+        static let serverURL = "serverURL"
+        static let voiceID = "voiceID"
+        static let modelID = "modelID"
+        static let textMode = "textMode"
+        static let volume = "volume"
+    }
+
+    init() {
+        let d = UserDefaults.standard
+        serverURL = d.string(forKey: Keys.serverURL) ?? "https://192.168.86.2:9178"
+        voiceID = d.string(forKey: Keys.voiceID) ?? ""
+        modelID = d.string(forKey: Keys.modelID)
+        textMode = d.bool(forKey: Keys.textMode)
+        volume = d.object(forKey: Keys.volume) as? Double ?? 0.8
+    }
+
+    var trimmedServerURL: String {
+        serverURL.trimmingCharacters(in: .whitespacesAndNewlines)
+    }
+}

Sources/App/VoiceApp.swift

@@ -0,0 +1,13 @@
+import SwiftUI
+
+@main
+struct VoiceApp: App {
+    @StateObject private var settings = SettingsStore()
+
+    var body: some Scene {
+        WindowGroup {
+            ConversationView(settings: settings)
+                .preferredColorScheme(.dark)
+        }
+    }
+}

Sources/Features/Conversation/ConversationView.swift

@@ -0,0 +1,36 @@
+import SwiftUI
+
+struct ConversationView: View {
+    @ObservedObject var settings: SettingsStore
+
+    var body: some View {
+        NavigationStack {
+            VStack(spacing: 24) {
+                Spacer()
+                Circle()
+                    .fill(.blue.gradient)
+                    .frame(width: 96, height: 96)
+                Text("Hope Voice")
+                    .font(.title.bold())
+                Text(settings.trimmedServerURL)
+                    .font(.footnote)
+                    .foregroundStyle(.secondary)
+                Spacer()
+            }
+            .navigationTitle("Voice")
+            .toolbar {
+                ToolbarItem(placement: .topBarTrailing) {
+                    NavigationLink {
+                        SettingsView(settings: settings)
+                    } label: {
+                        Image(systemName: "gearshape")
+                    }
+                }
+            }
+        }
+    }
+}
+
+#Preview {
+    ConversationView(settings: SettingsStore())
+}

Sources/Features/Settings/SettingsView.swift

@@ -0,0 +1,28 @@
+import SwiftUI
+
+struct SettingsView: View {
+    @ObservedObject var settings: SettingsStore
+    @State private var urlText: String = ""
+
+    var body: some View {
+        Form {
+            Section("Server") {
+                TextField("https://192.168.86.2:9178", text: $urlText)
+                    .keyboardType(.URL)
+                    .autocorrectionDisabled()
+                    .onAppear { urlText = settings.serverURL }
+                    .onChange(of: urlText) { _, newValue in
+                        settings.serverURL = newValue
+                    }
+            }
+            Section("Interaction") {
+                Toggle("Text mode", isOn: $settings.textMode)
+            }
+        }
+        .navigationTitle("Settings")
+    }
+}
+
+#Preview {
+    SettingsView(settings: SettingsStore())
+}