feat: add QR code scanner for media URLs

Sources/Localization.swift

@@ -50,4 +50,9 @@ enum L {
     // 打开按钮
     static let open          = NSLocalizedString("open",           value: "Open",          comment: "")
     static let list          = NSLocalizedString("list",           value: "List",          comment: "")
+    
+    // 扫码
+    static let scanQRCode    = NSLocalizedString("scan_qr_code",   value: "Scan QR Code",  comment: "")
+    static let scanHint      = NSLocalizedString("scan_hint",      value: "Point camera at a QR code containing a media URL", comment: "")
+    static let detectedCode  = NSLocalizedString("detected_code",  value: "Detected:",     comment: "")
 }

Sources/MiniPlayerApp.swift

@@ -262,6 +262,9 @@ struct BricksAppView: View {
             .sheet(isPresented: $bridge.showPlaylistSheet) {
                 PlaylistWindowView(bridge: bridge)
             }
+            .sheet(isPresented: $bridge.showQRScanner) {
+                QRScannerDialog(bridge: bridge)
+            }
     }
 }
 
@@ -294,6 +297,7 @@ struct ControlToolbar: View {
             HStack(spacing: 4) {
                 TB(icon: "folder") { bridge.openFileDialog(); onTouch() }
                 TB(icon: "link") { bridge.showURLDialog = true; onTouch() }
+                TB(icon: "qrcode.viewfinder") { bridge.showQRScanner = true; onTouch() }
                 TB(icon: "backward.fill") { bridge.playPrev(); onTouch() }
                 TB(icon: bridge.isPlaying ? "pause.fill" : "play.fill") { bridge.togglePlayPause(); onTouch() }
                 TB(icon: "forward.fill") { bridge.playNext(); onTouch() }

Sources/PlayerBridge.swift

@@ -51,6 +51,7 @@ final class PlayerBridge: ObservableObject {
     // MARK: - Published状态
     @Published var showURLDialog = false
     @Published var showTrackDialog = false
+    @Published var showQRScanner = false
     @Published var toastMessage: String?
     @Published var availableTracks: [String] = []
     @Published var currentTrackIndex: Int = 0

Sources/QRScannerView.swift

@@ -0,0 +1,171 @@
+import SwiftUI
+import AVFoundation
+
+#if os(macOS)
+import AppKit
+
+// MARK: - 二维码扫描器视图
+struct QRScannerView: NSViewRepresentable {
+    let onCodeDetected: (String) -> Void
+    
+    func makeCoordinator() -> Coordinator {
+        Coordinator(onCodeDetected: onCodeDetected)
+    }
+    
+    func makeNSView(context: Context) -> NSView {
+        let view = QRScannerHostView()
+        view.coordinator = context.coordinator
+        context.coordinator.previewLayer = view.previewLayer
+        
+        // 配置捕获会话
+        let session = AVCaptureSession()
+        context.coordinator.session = session
+        
+        guard let device = AVCaptureDevice.default(for: .video),
+              let input = try? AVCaptureDeviceInput(device: device) else {
+            return view
+        }
+        
+        if session.canAddInput(input) {
+            session.addInput(input)
+        }
+        
+        let output = AVCaptureMetadataOutput()
+        if session.canAddOutput(output) {
+            session.addOutput(output)
+            output.setMetadataObjectsDelegate(context.coordinator, queue: .main)
+            output.metadataObjectTypes = [.qr]
+        }
+        
+        view.previewLayer.session = session
+        view.previewLayer.videoGravity = .resizeAspectFill
+        
+        // 后台启动会话
+        DispatchQueue.global(qos: .userInitiated).async {
+            session.startRunning()
+        }
+        
+        return view
+    }
+    
+    func updateNSView(_ nsView: NSView, context: Context) {}
+    
+    // MARK: - Coordinator
+    class Coordinator: NSObject, AVCaptureMetadataOutputObjectsDelegate {
+        let onCodeDetected: (String) -> Void
+        var session: AVCaptureSession?
+        weak var previewLayer: AVCaptureVideoPreviewLayer?
+        private var lastDetected: String?
+        private var lastDetectedTime: Date = .distantPast
+        
+        init(onCodeDetected: @escaping (String) -> Void) {
+            self.onCodeDetected = onCodeDetected
+        }
+        
+        func metadataOutput(_ output: AVCaptureMetadataOutput, didOutput metadataObjects: [AVMetadataObject], from connection: AVCaptureConnection) {
+            guard let metadata = metadataObjects.first as? AVMetadataMachineReadableCodeObject,
+                  let code = metadata.stringValue else { return }
+            
+            // 防抖：同一码 3 秒内不重复触发
+            let now = Date()
+            if code == lastDetected, now.timeIntervalSince(lastDetectedTime) < 3 {
+                return
+            }
+            lastDetected = code
+            lastDetectedTime = now
+            
+            onCodeDetected(code)
+        }
+        
+        deinit {
+            session?.stopRunning()
+        }
+    }
+}
+
+// MARK: - 宿主视图
+class QRScannerHostView: NSView {
+    let previewLayer = AVCaptureVideoPreviewLayer()
+    weak var coordinator: QRScannerView.Coordinator?
+    
+    override init(frame: CGRect) {
+        super.init(frame: frame)
+        wantsLayer = true
+        layer = previewLayer
+    }
+    
+    required init?(coder: NSCoder) {
+        fatalError("init(coder:) has not been implemented")
+    }
+    
+    override func layout() {
+        super.layout()
+        previewLayer.frame = bounds
+    }
+}
+
+// MARK: - 扫码弹窗
+struct QRScannerDialog: View {
+    @ObservedObject var bridge: PlayerBridge
+    @Environment(\.dismiss) private var dismiss
+    @State private var detectedCode: String?
+    @State private var isProcessing = false
+    
+    var body: some View {
+        VStack(spacing: 16) {
+            Text(L.scanQRCode)
+                .font(.headline)
+            
+            Text(L.scanHint)
+                .font(.caption)
+                .foregroundColor(.secondary)
+            
+            QRScannerView { code in
+                detectedCode = code
+                handleCode(code)
+            }
+            .frame(width: 320, height: 240)
+            .cornerRadius(8)
+            
+            if let code = detectedCode {
+                VStack(spacing: 8) {
+                    Text(L.detectedCode)
+                        .font(.caption)
+                        .foregroundColor(.secondary)
+                    Text(code)
+                        .font(.system(.body, design: .monospaced))
+                        .lineLimit(2)
+                        .multilineTextAlignment(.center)
+                }
+                .padding(12)
+                .background(Color.secondary.opacity(0.1))
+                .cornerRadius(8)
+            }
+            
+            HStack {
+                Button(L.close) { dismiss() }
+                    .keyboardShortcut(.cancelAction)
+                Spacer()
+            }
+        }
+        .padding(20)
+        .frame(width: 380)
+    }
+    
+    private func handleCode(_ code: String) {
+        guard !isProcessing else { return }
+        
+        // 检查是否为有效 URL
+        if let url = URL(string: code), url.scheme == "http" || url.scheme == "https" {
+            isProcessing = true
+            bridge.addURL(code)
+            
+            // 延迟关闭弹窗
+            DispatchQueue.main.asyncAfter(deadline: .now() + 1.5) {
+                dismiss()
+            }
+        }
+    }
+}
+
+#endif