feat(ios): tab tabanlı navigasyon ve okuma durumu takibi ekle

ios/Bookibra/Views/AddBooks/BarcodeScannerView.swift

@@ -4,20 +4,62 @@ import VisionKit
 
 struct BarcodeScannerView: View {
     let onScanned: (String) -> Void
+    @State private var cameraAuthorized = AVCaptureDevice.authorizationStatus(for: .video) == .authorized
 
     var body: some View {
         Group {
-            if DataScannerViewController.isSupported, DataScannerViewController.isAvailable {
-                DataScannerRepresentable(onScanned: onScanned)
+            if cameraAuthorized {
+                if DataScannerViewController.isSupported, DataScannerViewController.isAvailable {
+                    DataScannerRepresentable(onScanned: onScanned)
+                } else {
+                    AVScannerRepresentable(onScanned: onScanned)
+                }
             } else {
-                AVScannerRepresentable(onScanned: onScanned)
+                scannerUnavailableView
             }
         }
+        .background(Color.black.opacity(0.85))
         .overlay {
             RoundedRectangle(cornerRadius: 16)
                 .stroke(Color.white.opacity(0.75), lineWidth: 2)
         }
         .accessibilityLabel("ISBN barkod tarayıcı")
+        .onAppear {
+            requestCameraPermissionIfNeeded()
+        }
+    }
+
+    private var scannerUnavailableView: some View {
+        VStack(spacing: 10) {
+            Image(systemName: "camera.viewfinder")
+                .font(.system(size: 30))
+                .foregroundStyle(.white.opacity(0.9))
+            Text("Kamera erişimi gerekli")
+                .font(.headline)
+                .foregroundStyle(.white)
+            Text("Barkod taramak için Ayarlar > Gizlilik > Kamera üzerinden izin verin.")
+                .font(.footnote)
+                .foregroundStyle(.white.opacity(0.85))
+                .multilineTextAlignment(.center)
+                .padding(.horizontal, 12)
+        }
+        .frame(maxWidth: .infinity, maxHeight: .infinity)
+    }
+
+    private func requestCameraPermissionIfNeeded() {
+        let status = AVCaptureDevice.authorizationStatus(for: .video)
+        switch status {
+        case .authorized:
+            cameraAuthorized = true
+        case .notDetermined:
+            AVCaptureDevice.requestAccess(for: .video) { granted in
+                DispatchQueue.main.async {
+                    cameraAuthorized = granted
+                }
+            }
+        default:
+            cameraAuthorized = false
+        }
     }
 }