Fix camera stuck in landscape - improve orientation detection

Issues fixed:
1. On app launch, UIDevice.current.orientation may be .unknown or .faceUp
   causing no orientation to be set (defaulting to landscape)

2. When phone is flat, orientation was being skipped

Solution:
- Track lastValidOrientation as fallback
- When device orientation is invalid, get from windowScene.interfaceOrientation
- Use last known good orientation if all else fails
- Default to portrait (90°) if nothing else works

This ensures the camera preview starts in the correct orientation
and stays properly rotated during use.

SelfieRingLight/Features/Camera/CameraPreview.swift

@@ -153,6 +153,9 @@ class CameraPreviewUIView: UIView {
         updatePreviewOrientation()
     }
     
+    /// Tracks the last valid orientation for fallback
+    private var lastValidOrientation: UIDeviceOrientation = .portrait
+    
     @objc private func handleOrientationChange() {
         updatePreviewOrientation()
     }
@@ -161,9 +164,36 @@ class CameraPreviewUIView: UIView {
         guard let connection = previewLayer?.connection else { return }
         
         // Get rotation angle based on device orientation
-        let deviceOrientation = UIDevice.current.orientation
+        var deviceOrientation = UIDevice.current.orientation
+        
+        // If device orientation is flat or unknown, try to get from interface orientation
+        if !deviceOrientation.isValidInterfaceOrientation {
+            // Use last known good orientation, or get from window scene
+            if let windowScene = window?.windowScene {
+                switch windowScene.interfaceOrientation {
+                case .portrait:
+                    deviceOrientation = .portrait
+                case .portraitUpsideDown:
+                    deviceOrientation = .portraitUpsideDown
+                case .landscapeLeft:
+                    deviceOrientation = .landscapeRight // Interface and device are inverted
+                case .landscapeRight:
+                    deviceOrientation = .landscapeLeft // Interface and device are inverted
+                case .unknown:
+                    deviceOrientation = lastValidOrientation
+                @unknown default:
+                    deviceOrientation = lastValidOrientation
+                }
+            } else {
+                deviceOrientation = lastValidOrientation
+            }
+        } else {
+            // Store this as the last valid orientation
+            lastValidOrientation = deviceOrientation
+        }
         
         // Calculate rotation angle (in degrees) for the preview layer
+        // For front camera in portrait: sensor is landscape, so rotate 90°
         let rotationAngle: CGFloat
         switch deviceOrientation {
         case .portrait:
@@ -174,10 +204,7 @@ class CameraPreviewUIView: UIView {
             rotationAngle = 180
         case .landscapeRight:
             rotationAngle = 0
-        case .faceUp, .faceDown, .unknown:
+        default:
-            // Keep current orientation for flat/unknown positions
-            return
-        @unknown default:
             rotationAngle = 90 // Default to portrait
         }