handle audio session interrupts by other media

fixes #495

Model/Player/Backends/MPVBackend.swift

@@ -254,7 +254,18 @@ final class MPVBackend: PlayerBackend {
 
         let startPlaying = {
             #if !os(macOS)
-                try? AVAudioSession.sharedInstance().setActive(true)
+                do {
+                    try AVAudioSession.sharedInstance().setActive(true)
+
+                    NotificationCenter.default.addObserver(
+                        self,
+                        selector: #selector(self.handleAudioSessionInterruption(_:)),
+                        name: AVAudioSession.interruptionNotification,
+                        object: nil
+                    )
+                } catch {
+                    self.logger.error("Error setting up audio session: \(error)")
+                }
             #endif
 
             DispatchQueue.main.async { [weak self] in
@@ -627,4 +638,31 @@ final class MPVBackend: PlayerBackend {
             logger.info("MPV backend received unhandled property: \(name)")
         }
     }
+
+    @objc func handleAudioSessionInterruption(_ notification: Notification) {
+        logger.info("Audio session interruption received.")
+
+        guard let info = notification.userInfo,
+              let typeValue = info[AVAudioSessionInterruptionTypeKey] as? UInt
+        else {
+            logger.info("AVAudioSessionInterruptionTypeKey is missing or not a UInt in userInfo.")
+            return
+        }
+
+        let type = AVAudioSession.InterruptionType(rawValue: typeValue)
+
+        logger.info("Interruption type received: \(String(describing: type))")
+
+        switch type {
+        case .began:
+            pause()
+            logger.info("Audio session interrupted.")
+        default:
+            break
+        }
+    }
+
+    deinit {
+        NotificationCenter.default.removeObserver(self, name: AVAudioSession.interruptionNotification, object: nil)
+    }
 }