Initial commit: HUDini — classic volume HUD for macOS

Menu bar utility that shows a centered HUD overlay with volume bars
when system volume changes. CoreAudio monitoring, auto-fade, works
on all spaces and fullscreen.

Co-Authored-By: Claude Opus 4.6 <noreply@anthropic.com>

Sources/HUDini/AppDelegate.swift

@@ -0,0 +1,70 @@
+import Cocoa
+import SwiftUI
+
+class AppDelegate: NSObject, NSApplicationDelegate {
+    private var statusItem: NSStatusItem!
+    private var volumeMonitor: VolumeMonitor!
+    private var hudPanel: HUDPanel!
+
+    func applicationDidFinishLaunching(_ notification: Notification) {
+        // Hide from Dock
+        NSApp.setActivationPolicy(.accessory)
+
+        setupStatusBar()
+        setupHUD()
+        setupVolumeMonitor()
+    }
+
+    private func setupStatusBar() {
+        statusItem = NSStatusBar.system.statusItem(withLength: NSStatusItem.squareLength)
+
+        if let button = statusItem.button {
+            button.image = NSImage(systemSymbolName: "speaker.wave.2.fill", accessibilityDescription: "HUDini")
+            button.image?.size = NSSize(width: 18, height: 18)
+        }
+
+        let menu = NSMenu()
+        menu.addItem(NSMenuItem(title: "HUDini", action: nil, keyEquivalent: ""))
+        menu.addItem(NSMenuItem.separator())
+
+        let enabledItem = NSMenuItem(title: "Enabled", action: #selector(toggleEnabled(_:)), keyEquivalent: "e")
+        enabledItem.state = .on
+        enabledItem.target = self
+        menu.addItem(enabledItem)
+
+        menu.addItem(NSMenuItem.separator())
+        let quitItem = NSMenuItem(title: "Quit", action: #selector(quit), keyEquivalent: "q")
+        quitItem.target = self
+        menu.addItem(quitItem)
+
+        statusItem.menu = menu
+    }
+
+    private func setupHUD() {
+        hudPanel = HUDPanel()
+    }
+
+    private func setupVolumeMonitor() {
+        volumeMonitor = VolumeMonitor { [weak self] volume, isMuted in
+            DispatchQueue.main.async {
+                self?.hudPanel.show(volume: volume, isMuted: isMuted)
+            }
+        }
+        volumeMonitor.start()
+    }
+
+    @objc private func toggleEnabled(_ sender: NSMenuItem) {
+        if sender.state == .on {
+            sender.state = .off
+            volumeMonitor.stop()
+        } else {
+            sender.state = .on
+            volumeMonitor.start()
+        }
+    }
+
+    @objc private func quit() {
+        volumeMonitor.stop()
+        NSApp.terminate(nil)
+    }
+}