Refactored MenuView into MenuItemToggleView

This change fixes some subtle state bugs in the switch handling by
making isOn a direct function of the Tunnel.

Apple/App/AppDelegate.swift

@@ -0,0 +1,51 @@
+#if os(macOS)
+import AppKit
+import SwiftUI
+
+@MainActor
+class AppDelegate: NSObject, NSApplicationDelegate {
+    private let quitItem: NSMenuItem = {
+        let quitItem = NSMenuItem(
+            title: "Quit Burrow",
+            action: #selector(NSApplication.terminate(_:)),
+            keyEquivalent: "q"
+        )
+        quitItem.target = NSApplication.shared
+        quitItem.keyEquivalentModifierMask = .command
+        return quitItem
+    }()
+
+    private let toggleItem: NSMenuItem = {
+        let toggleView = NSHostingView(rootView: MenuItemToggleView(tunnel: BurrowApp.tunnel))
+        toggleView.frame.size = CGSize(width: 300, height: 32)
+        toggleView.autoresizingMask = [.width]
+
+        let toggleItem = NSMenuItem()
+        toggleItem.view = toggleView
+        return toggleItem
+    }()
+
+    private lazy var menu: NSMenu = {
+        let menu = NSMenu()
+        menu.items = [
+            toggleItem,
+            .separator(),
+            quitItem
+        ]
+        return menu
+    }()
+
+    private lazy var statusItem: NSStatusItem = {
+        let statusBar = NSStatusBar.system
+        let statusItem = statusBar.statusItem(withLength: NSStatusItem.squareLength)
+        if let button = statusItem.button {
+            button.image = NSImage(systemSymbolName: "network.badge.shield.half.filled", accessibilityDescription: nil)
+        }
+        return statusItem
+    }()
+
+    func applicationDidFinishLaunching(_ notification: Notification) {
+        statusItem.menu = menu
+    }
+}
+#endif