Merge iOS and Mac app into one

ABS Client/Audiobookshelf swift/Services/NetworkMonitor.swift

@@ -0,0 +1,31 @@
+import Foundation
+import Network
+import Observation
+
+@Observable
+@MainActor
+final class NetworkMonitor {
+    var isOnline: Bool = true
+
+    private let monitor = NWPathMonitor()
+    private let queue = DispatchQueue(label: "NetworkMonitor")
+
+    func start(onChange: @escaping @MainActor (Bool) -> Void) {
+        monitor.pathUpdateHandler = { [weak self] path in
+            let online = path.status == .satisfied
+            Task { @MainActor [weak self] in
+                guard let self else { return }
+                let previous = self.isOnline
+                self.isOnline = online
+                if previous != online {
+                    onChange(online)
+                }
+            }
+        }
+        monitor.start(queue: queue)
+    }
+
+    func stop() {
+        monitor.cancel()
+    }
+}