Add release metadata, about panel, and repo policies

Sources/BearWaveApp/BearWaveApp.swift

@@ -4,6 +4,8 @@ import SwiftUI
 
 @main
 struct BearWaveApp: App {
+    private static let releaseVersion = "v0.1.0-alpha.1"
+    private static let buildVersion = "1"
     @NSApplicationDelegateAdaptor(AppDelegate.self) private var appDelegate
     @State private var model = AppModel()
     @State private var isMiniPlayer = false
@@ -32,6 +34,11 @@ struct BearWaveApp: App {
         }
         .defaultSize(width: Self.windowWidth, height: 720)
         .commands {
+            CommandGroup(replacing: .appInfo) {
+                Button("About BearWave") {
+                    showAboutPanel()
+                }
+            }
             CommandGroup(after: .appTermination) {
                 Button("Play/Pause") {
                     model.playback.togglePlayPause()
@@ -58,6 +65,22 @@ struct BearWaveApp: App {
         }
     }
 
+    private func showAboutPanel() {
+        var options: [NSApplication.AboutPanelOptionKey: Any] = [
+            .applicationName: "BearWave",
+            .applicationVersion: Self.releaseVersion,
+            .version: "Build \(Self.buildVersion)"
+        ]
+
+        if let iconURL = Bundle.main.url(forResource: "bearwave_about", withExtension: "png"),
+           let icon = NSImage(contentsOf: iconURL) {
+            options[.applicationIcon] = icon
+        }
+
+        NSApp.orderFrontStandardAboutPanel(options: options)
+        NSApp.activate(ignoringOtherApps: true)
+    }
+
     private func resizeWindow(toMini: Bool) {
         let targetSize = toMini ? CGSize(width: 555, height: 110) : CGSize(width: Self.windowWidth, height: 720)
         Task { @MainActor in