Merge pull request 'fix: back button bounces user back into selected business' (#31) from schwifty/fix-back-button-bounce into main

When tapping Back from ScanView, BusinessListView remounts and .task fires
loadBusinesses() which sees AppPrefs.lastBusinessId still set — immediately
re-navigating into the same business. Fix: clear lastBusinessId on back,
and add skipAutoNav flag to also prevent single-business auto-select from
firing when user explicitly navigated back.

Co-Authored-By: Claude Opus 4.6 (1M context) <noreply@anthropic.com>

PayfritBeacon/App/AppState.swift

@@ -14,6 +14,9 @@ final class AppState: ObservableObject {
     @Published var token: String?
     @Published var userId: String?
 
+    /// When true, skip auto-navigation in BusinessListView (user explicitly went back)
+    var skipAutoNav = false
+
     init() {
         // Restore saved session
         if let saved = SecureStorage.loadSession() {
@@ -36,6 +39,8 @@ final class AppState: ObservableObject {
     }
 
     func backToBusinessList() {
+        AppPrefs.lastBusinessId = nil
+        skipAutoNav = true
         currentScreen = .businessList
     }
 

PayfritBeacon/Info.plist

@@ -22,6 +22,8 @@
 	<string>$(CURRENT_PROJECT_VERSION)</string>
 	<key>LSRequiresIPhoneOS</key>
 	<true/>
+	<key>NSCameraUsageDescription</key>
+	<string>Payfrit Beacon needs camera access to scan QR codes on beacon labels for provisioning.</string>
 	<key>NSBluetoothAlwaysUsageDescription</key>
 	<string>Payfrit Beacon needs Bluetooth to detect and configure nearby beacons.</string>
 	<key>NSBluetoothPeripheralUsageDescription</key>

PayfritBeacon/Views/BusinessListView.swift

@@ -94,6 +94,8 @@ struct BusinessListView: View {
             let list = try await APIClient.shared.listBusinesses(token: token)
             businesses = list
 
+            // Skip auto-navigation if user explicitly tapped Back
+            if !appState.skipAutoNav {
                 // Auto-navigate if only one business (like Android)
                 if list.count == 1, let only = list.first {
                     appState.selectBusiness(only)
@@ -106,6 +108,8 @@ struct BusinessListView: View {
                     appState.selectBusiness(last)
                     return
                 }
+            }
+            appState.skipAutoNav = false
         } catch let e as APIError where e.errorDescription == APIError.unauthorized.errorDescription {
             appState.logout()
         } catch {

PayfritBeacon/Views/QRScannerView.swift

@@ -241,17 +241,31 @@ final class CameraPreviewUIView: UIView {
     func setFlash(_ on: Bool) {
         guard let device = AVCaptureDevice.default(for: .video),
               device.hasTorch else { return }
-        try? device.lockForConfiguration()
+        do {
+            try device.lockForConfiguration()
             device.torchMode = on ? .on : .off
             device.unlockForConfiguration()
+        } catch {
+            NSLog("[QRScanner] Failed to set torch: \(error.localizedDescription)")
+        }
     }
 
     private func setupCamera() {
         let session = AVCaptureSession()
         session.sessionPreset = .high
 
-        guard let device = AVCaptureDevice.default(.builtInWideAngleCamera, for: .video, position: .back),
-              let input = try? AVCaptureDeviceInput(device: device) else { return }
+        guard let device = AVCaptureDevice.default(.builtInWideAngleCamera, for: .video, position: .back) else {
+            NSLog("[QRScanner] ERROR: No back camera available")
+            return
+        }
+
+        let input: AVCaptureDeviceInput
+        do {
+            input = try AVCaptureDeviceInput(device: device)
+        } catch {
+            NSLog("[QRScanner] ERROR: Failed to create camera input: \(error.localizedDescription)")
+            return
+        }
 
         if session.canAddInput(input) {
             session.addInput(input)