refactor: Fix macOS standalone application

ApplicationLibrary/Views/Setting/SettingView.swift

@@ -1,6 +1,26 @@
 import Library
 import SwiftUI
 
+#if os(macOS)
+    private struct SettingsNavigationPathKey: EnvironmentKey {
+        static let defaultValue: Binding<NavigationPath>? = nil
+    }
+
+    public extension EnvironmentValues {
+        var settingsNavigationPath: Binding<NavigationPath>? {
+            get { self[SettingsNavigationPathKey.self] }
+            set { self[SettingsNavigationPathKey.self] = newValue }
+        }
+    }
+#endif
+
+#if os(macOS)
+    public enum SettingsPage: Hashable {
+        case app
+        case core, packetTunnel, onDemandRules, profileOverride, sponsors
+    }
+#endif
+
 public struct SettingView: View {
     private enum Tabs: Int, CaseIterable, Identifiable {
         var id: Self {
@@ -13,6 +33,25 @@ public struct SettingView: View {
 
         case core, packetTunnel, onDemandRules, profileOverride, sponsors
 
+        #if os(macOS)
+            var page: SettingsPage {
+                switch self {
+                case .app:
+                    return .app
+                case .core:
+                    return .core
+                case .packetTunnel:
+                    return .packetTunnel
+                case .onDemandRules:
+                    return .onDemandRules
+                case .profileOverride:
+                    return .profileOverride
+                case .sponsors:
+                    return .sponsors
+                }
+            }
+        #endif
+
         var label: some View {
             Label(title, systemImage: iconImage)
         }
@@ -83,16 +122,45 @@ public struct SettingView: View {
 
         @MainActor
         var navigationLink: some View {
-            FormNavigationLink {
-                contentView
-            } label: {
-                label
-            }
+            #if os(macOS)
+                FormNavigationLink(value: page) {
+                    label
+                }
+            #else
+                FormNavigationLink {
+                    contentView
+                } label: {
+                    label
+                }
+            #endif
         }
     }
 
-    @StateObject private var viewModel = SettingViewModel()
+    #if os(macOS)
+        @MainActor
+        @ViewBuilder
+        private static func destinationView(for page: SettingsPage) -> some View {
+            Group {
+                switch page {
+                case .app:
+                    AppView()
+                case .core:
+                    CoreView()
+                case .packetTunnel:
+                    PacketTunnelView()
+                case .onDemandRules:
+                    OnDemandRulesView()
+                case .profileOverride:
+                    ProfileOverrideView()
+                case .sponsors:
+                    SponsorsView()
+                }
+            }
+            .frame(maxWidth: .infinity, maxHeight: .infinity, alignment: .center)
+        }
+    #endif
 
+    @StateObject private var viewModel = SettingViewModel()
     public init() {}
     public var body: some View {
         FormView {
@@ -159,5 +227,10 @@ public struct SettingView: View {
                 }
             }
         }
+        #if os(macOS)
+        .formNavigationDestination(for: SettingsPage.self) { page in
+            Self.destinationView(for: page)
+        }
+        #endif
     }
 }