iOS: Scanner – Pinch-Zoom und schlaueres Blitzlicht

- Zwei-Finger-Pinch zoomt im Kamerabild naeher an einen Code heran (digital,
  auf Faktor 6 begrenzt).
- Blitz geht nach dem ersten erfolgreichen Scan wieder aus. Per Langdruck auf
  den Blitz-Knopf bleibt er dauerhaft an (gesperrt, gelb); Tippen schaltet aus
  und hebt die Sperre auf. Gilt fuer alle Scan-Bildschirme.

Co-Authored-By: Claude Opus 4.8 <noreply@anthropic.com>

ios/Sources/AssignScanView.swift

@@ -8,6 +8,7 @@ struct AssignScanView: View {
 
     @State private var paused = false
     @State private var torchOn = false
+    @State private var torchLocked = false
     @State private var pending: Item?          // gescanntes Stück, wartet auf Ort
     @State private var status: String?
     @State private var error: String?
@@ -16,7 +17,7 @@ struct AssignScanView: View {
         ScrollView {
             VStack(spacing: 14) {
                 ScannerView(onCode: { code in Task { await handle(code) } },
-                            isPaused: $paused, torchOn: $torchOn)
+                            isPaused: $paused, torchOn: $torchOn, torchLocked: $torchLocked)
                     .aspectRatio(4.0 / 3.0, contentMode: .fit)
                     .clipShape(RoundedRectangle(cornerRadius: 16))
                     .padding(.horizontal)
@@ -52,7 +53,7 @@ struct AssignScanView: View {
         .navigationBarTitleDisplayMode(.inline)
         .toolbar {
             ToolbarItem(placement: .topBarLeading) { Button("Fertig") { dismiss() } }
-            ToolbarItem(placement: .topBarTrailing) { TorchButton(isOn: $torchOn) }
+            ToolbarItem(placement: .topBarTrailing) { TorchButton(isOn: $torchOn, locked: $torchLocked) }
         }
     }
 

ios/Sources/CheckInView.swift

@@ -5,6 +5,7 @@ struct CheckInView: View {
 
     @State private var paused = false
     @State private var torchOn = false
+    @State private var torchLocked = false
     @State private var status: String?
     @State private var error: String?
 
@@ -27,7 +28,7 @@ struct CheckInView: View {
         ScrollView {
             VStack(spacing: 14) {
                 ScannerView(onCode: { code in Task { await resolve(code) } },
-                            isPaused: $paused, torchOn: $torchOn)
+                            isPaused: $paused, torchOn: $torchOn, torchLocked: $torchLocked)
                     .aspectRatio(4.0 / 3.0, contentMode: .fit)
                     .clipShape(RoundedRectangle(cornerRadius: 16))
                     .padding(.horizontal)
@@ -74,7 +75,7 @@ struct CheckInView: View {
             ToolbarItem(placement: .topBarLeading) {
                 Button("Fertig") { dismiss() }
             }
-            ToolbarItem(placement: .topBarTrailing) { TorchButton(isOn: $torchOn) }
+            ToolbarItem(placement: .topBarTrailing) { TorchButton(isOn: $torchOn, locked: $torchLocked) }
         }
         .task {
             units = (try? await APIClient.shared.units()) ?? []

ios/Sources/CheckOutView.swift

@@ -5,6 +5,7 @@ struct CheckOutView: View {
 
     @State private var paused = false
     @State private var torchOn = false
+    @State private var torchLocked = false
     @State private var status: String?
     @State private var error: String?
     @State private var product: Product?
@@ -18,7 +19,7 @@ struct CheckOutView: View {
         ScrollView {
             VStack(spacing: 14) {
                 ScannerView(onCode: { code in Task { await resolve(code) } },
-                            isPaused: $paused, torchOn: $torchOn)
+                            isPaused: $paused, torchOn: $torchOn, torchLocked: $torchLocked)
                     .aspectRatio(4.0 / 3.0, contentMode: .fit)
                     .clipShape(RoundedRectangle(cornerRadius: 16))
                     .padding(.horizontal)
@@ -56,7 +57,7 @@ struct CheckOutView: View {
         .navigationBarTitleDisplayMode(.inline)
         .toolbar {
             ToolbarItem(placement: .topBarLeading) { Button("Fertig") { dismiss() } }
-            ToolbarItem(placement: .topBarTrailing) { TorchButton(isOn: $torchOn) }
+            ToolbarItem(placement: .topBarTrailing) { TorchButton(isOn: $torchOn, locked: $torchLocked) }
         }
         .task { units = (try? await APIClient.shared.units()) ?? [] }
         .alert("EAN eingeben", isPresented: $manualCodeShown) {

ios/Sources/LookupScanView.swift

@@ -8,6 +8,7 @@ struct LookupScanView: View {
 
     @State private var paused = false
     @State private var torchOn = false
+    @State private var torchLocked = false
     @State private var error: String?
     @State private var item: Item?
     @State private var product: Product?
@@ -16,7 +17,7 @@ struct LookupScanView: View {
         ScrollView {
             VStack(spacing: 14) {
                 ScannerView(onCode: { code in Task { await resolve(code) } },
-                            isPaused: $paused, torchOn: $torchOn)
+                            isPaused: $paused, torchOn: $torchOn, torchLocked: $torchLocked)
                     .aspectRatio(4.0 / 3.0, contentMode: .fit)
                     .clipShape(RoundedRectangle(cornerRadius: 16))
                     .padding(.horizontal)
@@ -36,7 +37,7 @@ struct LookupScanView: View {
         .navigationBarTitleDisplayMode(.inline)
         .toolbar {
             ToolbarItem(placement: .topBarLeading) { Button("Fertig") { dismiss() } }
-            ToolbarItem(placement: .topBarTrailing) { TorchButton(isOn: $torchOn) }
+            ToolbarItem(placement: .topBarTrailing) { TorchButton(isOn: $torchOn, locked: $torchLocked) }
         }
         .sheet(item: $item, onDismiss: { paused = false }) { it in
             NavigationStack { ItemEditView(item: it) }

ios/Sources/ScannerView.swift

@@ -7,6 +7,9 @@ struct ScannerView: UIViewControllerRepresentable {
     var onCode: (String) -> Void
     @Binding var isPaused: Bool
     @Binding var torchOn: Bool
+    /// Per Langdruck gesperrter Blitz bleibt auch nach einem Scan an. Standard:
+    /// aus nach dem ersten Treffer.
+    @Binding var torchLocked: Bool
 
     func makeCoordinator() -> Coordinator { Coordinator(onCode: onCode) }
 
@@ -18,12 +21,16 @@ struct ScannerView: UIViewControllerRepresentable {
 
     func updateUIViewController(_ controller: ScannerViewController, context: Context) {
         context.coordinator.isPaused = isPaused
+        context.coordinator.torchLocked = torchLocked
+        context.coordinator.torchBinding = $torchOn
         controller.setTorch(on: torchOn)
     }
 
     final class Coordinator: NSObject, ScannerViewControllerDelegate {
         let onCode: (String) -> Void
         var isPaused: Bool = false
+        var torchLocked: Bool = false
+        var torchBinding: Binding<Bool>?
         private var lastCode: String?
         private var lastTime: Date = .distantPast
 
@@ -37,21 +44,42 @@ struct ScannerView: UIViewControllerRepresentable {
             lastTime = Date()
             AudioServicesPlaySystemSound(1057)
             onCode(code)
+            // Blitz nach dem Scan ausschalten – ausser er ist per Langdruck gesperrt.
+            if !torchLocked, torchBinding?.wrappedValue == true {
+                DispatchQueue.main.async { [weak self] in self?.torchBinding?.wrappedValue = false }
+            }
         }
     }
 }
 
 /// Licht-Schalter fuer die Scan-Bildschirme.
+///
+/// Tippen: an/aus – angeschaltet geht der Blitz nach dem naechsten Scan wieder
+/// aus. Langdruck: dauerhaft an (gesperrt, gelb), bleibt auch nach Scans an;
+/// erneutes Tippen schaltet aus und hebt die Sperre auf.
 struct TorchButton: View {
     @Binding var isOn: Bool
+    @Binding var locked: Bool
 
     var body: some View {
         Button {
+            locked = false
             isOn.toggle()
         } label: {
             Image(systemName: isOn ? "bolt.fill" : "bolt.slash.fill")
+                .foregroundStyle(locked ? Color.yellow : Color.accentColor)
         }
-        .accessibilityLabel(isOn ? "Licht ausschalten" : "Licht einschalten")
+        .simultaneousGesture(
+            LongPressGesture(minimumDuration: 0.4).onEnded { _ in
+                isOn = true
+                locked = true
+            }
+        )
+        .accessibilityLabel(
+            isOn
+                ? (locked ? "Licht dauerhaft an, zum Ausschalten tippen" : "Licht aus")
+                : "Licht ein (bleibt bis zum nächsten Scan)"
+        )
     }
 }
 
@@ -65,6 +93,8 @@ final class ScannerViewController: UIViewController, AVCaptureMetadataOutputObje
     private let session = AVCaptureSession()
     private var preview: AVCaptureVideoPreviewLayer?
     private var device: AVCaptureDevice?
+    /// Zoomfaktor beim Beginn einer Pinch-Geste (Ausgangspunkt fuers Skalieren).
+    private var zoomBasis: CGFloat = 1.0
 
     /// Auch krummere Symbologien mitnehmen: ITF-14 kommt auf Umkartons vor,
     /// DataMatrix auf kleinen Aufklebern.
@@ -77,6 +107,7 @@ final class ScannerViewController: UIViewController, AVCaptureMetadataOutputObje
         super.viewDidLoad()
         view.backgroundColor = .black
         view.addGestureRecognizer(UITapGestureRecognizer(target: self, action: #selector(focusOnTap)))
+        view.addGestureRecognizer(UIPinchGestureRecognizer(target: self, action: #selector(zoomPinch)))
         AVCaptureDevice.requestAccess(for: .video) { [weak self] granted in
             guard granted else { return }
             DispatchQueue.main.async { self?.configure() }
@@ -164,6 +195,20 @@ final class ScannerViewController: UIViewController, AVCaptureMetadataOutputObje
         device.unlockForConfiguration()
     }
 
+    /// Zwei-Finger-Pinch zoomt naeher an einen Code heran (rein digital, auf ein
+    /// sinnvolles Maximum begrenzt – zu viel Zoom macht den Code unscharf).
+    @objc private func zoomPinch(_ gesture: UIPinchGestureRecognizer) {
+        guard let device else { return }
+        if gesture.state == .began {
+            zoomBasis = device.videoZoomFactor
+        }
+        let maxZoom = min(device.activeFormat.videoMaxZoomFactor, 6.0)
+        let neu = max(1.0, min(zoomBasis * gesture.scale, maxZoom))
+        guard (try? device.lockForConfiguration()) != nil else { return }
+        device.videoZoomFactor = neu
+        device.unlockForConfiguration()
+    }
+
     /// Kurzer gelber Fokus-Rahmen an der getippten Stelle als Rueckmeldung.
     private func showFocusIndicator(at point: CGPoint) {
         let seite: CGFloat = 72