Add manual rotation button for camera preview

New feature: Rotate preview independent of device orientation
- Rotate button in top control bar (next to Center Stage)
- Cycles through: 0° → 90° → 180° → 270° → 0°
- Yellow highlight when rotation is active
- Icon changes to show current rotation state

Ring light integration:
- Preview background color now matches ring light color
- Letterbox areas (from aspect ratio differences) show ring light
- Placeholder during permission request also uses ring light color

Visual feedback:
- rotate.right (outline) = no rotation
- rotate.right.fill = 90° right
- arrow.up.arrow.down = 180°
- rotate.left.fill = 270° (90° left)

Full accessibility support with labels and hints.

SelfieRingLight/Features/Camera/CameraPreview.swift

@@ -8,11 +8,15 @@ struct CameraPreview: UIViewRepresentable {
     // These properties trigger view updates when they change
     var isMirrorFlipped: Bool
     var zoomFactor: Double
+    var manualRotationAngle: CGFloat
+    var ringLightColor: Color
     
-    init(viewModel: CameraViewModel, isMirrorFlipped: Bool, zoomFactor: Double) {
+    init(viewModel: CameraViewModel, isMirrorFlipped: Bool, zoomFactor: Double, manualRotationAngle: CGFloat = 0, ringLightColor: Color = .white) {
         self.viewModel = viewModel
         self.isMirrorFlipped = isMirrorFlipped
         self.zoomFactor = zoomFactor
+        self.manualRotationAngle = manualRotationAngle
+        self.ringLightColor = ringLightColor
     }
     
     func makeUIView(context: Context) -> CameraPreviewUIView {
@@ -28,6 +32,12 @@ struct CameraPreview: UIViewRepresentable {
     }
     
     func updateUIView(_ uiView: CameraPreviewUIView, context: Context) {
+        // Update background color to match ring light
+        uiView.backgroundColor = UIColor(ringLightColor)
+        
+        // Update manual rotation
+        uiView.manualRotationAngle = manualRotationAngle
+        
         // Force layout update
         uiView.setNeedsLayout()
         uiView.layoutIfNeeded()
@@ -94,6 +104,9 @@ class CameraPreviewUIView: UIView {
     private weak var viewModel: CameraViewModel?
     var previewLayer: AVCaptureVideoPreviewLayer?
     
+    /// Manual rotation offset from user (0, 90, 180, 270)
+    var manualRotationAngle: CGFloat = 0
+    
     override class var layerClass: AnyClass {
         AVCaptureVideoPreviewLayer.self
     }
@@ -192,25 +205,29 @@ class CameraPreviewUIView: UIView {
             lastValidOrientation = deviceOrientation
         }
         
-        // Calculate rotation angle (in degrees) for the preview layer
+        // Calculate base rotation angle (in degrees) for the preview layer
         // For front camera in portrait: sensor is landscape, so rotate 90°
-        let rotationAngle: CGFloat
+        let baseRotationAngle: CGFloat
         switch deviceOrientation {
         case .portrait:
-            rotationAngle = 90
+            baseRotationAngle = 90
         case .portraitUpsideDown:
-            rotationAngle = 270
+            baseRotationAngle = 270
         case .landscapeLeft:
-            rotationAngle = 180
+            baseRotationAngle = 180
         case .landscapeRight:
-            rotationAngle = 0
+            baseRotationAngle = 0
         default:
-            rotationAngle = 90 // Default to portrait
+            baseRotationAngle = 90 // Default to portrait
         }
         
+        // Add manual rotation offset and normalize to 0-360
+        let totalRotation = (baseRotationAngle + manualRotationAngle).truncatingRemainder(dividingBy: 360)
+        let finalRotation = totalRotation < 0 ? totalRotation + 360 : totalRotation
+        
         // Use modern rotation angle API (iOS 17+)
-        if connection.isVideoRotationAngleSupported(rotationAngle) {
-            connection.videoRotationAngle = rotationAngle
+        if connection.isVideoRotationAngleSupported(finalRotation) {
+            connection.videoRotationAngle = finalRotation
         }
     }
 }

SelfieRingLight/Features/Camera/CameraViewModel.swift

@@ -38,8 +38,24 @@ class CameraViewModel: NSObject {
     /// Whether Center Stage is currently enabled
     var isCenterStageEnabled = false
     
+    /// Manual rotation offset (0, 90, 180, 270 degrees)
+    /// Allows user to rotate preview independent of device orientation
+    var manualRotationAngle: CGFloat = 0
+    
     let settings = SettingsViewModel() // Shared config
     
+    // MARK: - Manual Rotation
+    
+    /// Cycles through rotation angles: 0 → 90 → 180 → 270 → 0
+    func cycleManualRotation() {
+        manualRotationAngle = (manualRotationAngle + 90).truncatingRemainder(dividingBy: 360)
+    }
+    
+    /// Resets manual rotation to match device orientation
+    func resetManualRotation() {
+        manualRotationAngle = 0
+    }
+    
     // MARK: - Screen Brightness Handling
     
     /// Gets the current screen from any available window scene

SelfieRingLight/Features/Camera/ContentView.swift

@@ -115,16 +115,19 @@ struct ContentView: View {
                 CameraPreview(
                     viewModel: viewModel,
                     isMirrorFlipped: viewModel.settings.isMirrorFlipped,
-                    zoomFactor: viewModel.settings.currentZoomFactor
+                    zoomFactor: viewModel.settings.currentZoomFactor,
+                    manualRotationAngle: viewModel.manualRotationAngle,
+                    ringLightColor: viewModel.settings.lightColor
                 )
                 .clipShape(.rect(cornerRadius: Design.CornerRadius.large))
                 .padding(ringSize)
                 .animation(.easeInOut(duration: Design.Animation.quick), value: ringSize)
+                .animation(.easeInOut(duration: Design.Animation.quick), value: viewModel.manualRotationAngle)
             }
         } else {
             // Show placeholder while requesting permission
             Rectangle()
-                .fill(.black)
+                .fill(viewModel.settings.lightColor)
                 .clipShape(.rect(cornerRadius: Design.CornerRadius.large))
                 .padding(ringSize)
                 .animation(.easeInOut(duration: Design.Animation.quick), value: ringSize)
@@ -176,6 +179,22 @@ struct ContentView: View {
                 .accessibilityHint(String(localized: "Keeps you centered in frame"))
             }
             
+            // Rotate preview button
+            Button {
+                withAnimation(.easeInOut(duration: Design.Animation.quick)) {
+                    viewModel.cycleManualRotation()
+                }
+            } label: {
+                Image(systemName: rotationIconName)
+                    .font(.body)
+                    .foregroundStyle(viewModel.manualRotationAngle != 0 ? .yellow : .white)
+                    .padding(Design.Spacing.small)
+                    .background(.ultraThinMaterial, in: .circle)
+            }
+            .accessibilityLabel(String(localized: "Rotate preview"))
+            .accessibilityValue(rotationAccessibilityValue)
+            .accessibilityHint(String(localized: "Rotates the camera preview 90 degrees"))
+            
             Spacer()
             
             // Grid toggle
@@ -205,6 +224,36 @@ struct ContentView: View {
         }
     }
     
+    /// Icon name for rotation button based on current rotation
+    private var rotationIconName: String {
+        switch viewModel.manualRotationAngle {
+        case 90:
+            return "rotate.right.fill"
+        case 180:
+            return "arrow.up.arrow.down"
+        case 270:
+            return "rotate.left.fill"
+        default:
+            return "rotate.right"
+        }
+    }
+    
+    /// Accessibility value for rotation button
+    private var rotationAccessibilityValue: String {
+        switch viewModel.manualRotationAngle {
+        case 0:
+            return String(localized: "No rotation")
+        case 90:
+            return String(localized: "Rotated 90 degrees right")
+        case 180:
+            return String(localized: "Rotated 180 degrees")
+        case 270:
+            return String(localized: "Rotated 90 degrees left")
+        default:
+            return String(localized: "Custom rotation")
+        }
+    }
+    
     // MARK: - Bottom Control Bar
     
     private var bottomControlBar: some View {