feat: add tray icon and context menu for main window and queues

Sources/Firelink/FirelinkApp.swift

@@ -15,7 +15,7 @@ struct FirelinkApp: App {
     }
 
     var body: some Scene {
-        WindowGroup {
+        WindowGroup(id: "main") {
             ContentView()
                 .environmentObject(controller)
                 .environmentObject(settings)
@@ -50,5 +50,10 @@ struct FirelinkApp: App {
                 .keyboardShortcut("r", modifiers: [.command])
             }
         }
+
+        MenuBarExtra("Firelink", systemImage: "arrow.down.circle") {
+            TrayMenuView()
+                .environmentObject(controller)
+        }
     }
 }

Sources/Firelink/TrayMenuView.swift

@@ -0,0 +1,38 @@
+import SwiftUI
+
+struct TrayMenuView: View {
+    @Environment(\.openWindow) private var openWindow
+    @EnvironmentObject private var controller: DownloadController
+
+    var body: some View {
+        Button("Show main window") {
+            openWindow(id: "main")
+            NSApp.activate(ignoringOtherApps: true)
+        }
+
+        Button("Add downloads") {
+            openWindow(id: "add-downloads")
+            NSApp.activate(ignoringOtherApps: true)
+        }
+
+        Menu("Start queue") {
+            ForEach(controller.queues) { queue in
+                Button(queue.name) {
+                    controller.startQueue(queueID: queue.id)
+                }
+            }
+        }
+
+        Button("Stop downloads") {
+            for download in controller.downloads where download.status == .downloading {
+                controller.pause(download)
+            }
+        }
+
+        Divider()
+
+        Button("Exit") {
+            NSApplication.shared.terminate(nil)
+        }
+    }
+}