Fix frozen camera background bug

This should fix the issue where you have camera view open, background, then on foreground it is frozen with the image on the screen immediately before it was minimized.

Author: cwbooth5

SnapSafe/Screens/Camera/CameraViewModel.swift

@@ -119,6 +119,12 @@ class CameraViewModel: NSObject, ObservableObject {
             name: UIApplication.willEnterForegroundNotification,
             object: nil
         )
+        NotificationCenter.default.addObserver(
+            self,
+            selector: #selector(handleAppWillResignActive),
+            name: UIApplication.willResignActiveNotification,
+            object: nil
+        )
     }
 
     deinit {
@@ -132,6 +138,11 @@ class CameraViewModel: NSObject, ObservableObject {
         resetZoomLevel()
     }
 
+    @objc private func handleAppWillResignActive() {
+        Logger.camera.info("App will resign active, stopping camera")
+        stopCameraSession()
+    }
+
     func restartCameraSessionIfNeeded() {
         let session = self.session
         if !session.isRunning {
@@ -141,6 +152,16 @@ class CameraViewModel: NSObject, ObservableObject {
             }
         }
     }
+
+    func stopCameraSession() {
+        let session = self.session
+        if session.isRunning {
+            Logger.camera.info("Stopping camera session")
+            DispatchQueue.global(qos: .userInitiated).async {
+                session.stopRunning()
+            }
+        }
+    }
 
 
     func checkAndSetupCamera() async {