feat: replace Preferences window with SwiftUI

Source/ApplicationController.h

@@ -19,7 +19,6 @@
  ***************************************************************************/
 
 #import "HostsMainController.h"
-#import "PreferenceController.h"
 
 @class AboutBoxController;
 
@@ -30,7 +29,6 @@
 	int busyThreads;
 	BOOL shouldQuit;
 	BOOL editorWindowOpened;
-	PreferenceController *preferenceController;
     AboutBoxController *aboutBoxController;
 }
 

Source/ApplicationController.m

@@ -78,12 +78,8 @@ - (id)init
 
 -(IBAction)openPreferencesWindow:(id)sender
 {
-	if (!preferenceController) {
-		preferenceController = [[PreferenceController alloc] init];
-	}
-
     [self showApplicationInDock];
-	[preferenceController showWindow:self];
+	[PreferencesPresenter showPreferences];
 }
 
 - (IBAction)displayAboutBox:(id)sender

Source/Swift/GasMask-Bridging-Header.h

@@ -2,3 +2,7 @@
 #import "Network.h"
 #import "HostsMainController.h"
 #import "RemoteHostsController.h"
+#import "Hotkey.h"
+#import "Preferences.h"
+#import "Preferences+Remote.h"
+#import "LoginItem.h"

Source/Swift/LoginItemObserver.swift

@@ -0,0 +1,19 @@
+import Foundation
+
+/// Thin ObservableObject wrapper around the existing ObjC `LoginItem` class.
+///
+/// Delegates all `SMAppService` logic to `LoginItem`, avoiding a parallel implementation.
+final class LoginItemObserver: ObservableObject {
+    private let loginItem = LoginItem()
+
+    @Published var isEnabled: Bool {
+        didSet {
+            guard isEnabled != oldValue else { return }
+            loginItem.setEnabled(isEnabled)
+        }
+    }
+
+    init() {
+        self.isEnabled = loginItem.enabled()
+    }
+}