Add autoplay feature and playback end handling (#214)

- Introduced a new setting for "Autoplay Next" in the player settings.
- Implemented autoplay functionality in the CustomMediaPlayerViewController to automatically start the next episode when playback ends.
- Added notification observers for handling playback completion and managing the autoplay behavior.

Co-authored-by: cranci <100066266+cranci1@users.noreply.github.com>

Sora/MediaUtils/CustomPlayer/CustomPlayer.swift

@@ -77,6 +77,13 @@ class CustomMediaPlayerViewController: UIViewController, UIGestureRecognizerDele
         }
         return UserDefaults.standard.bool(forKey: "pipButtonVisible")
     }
+    
+    private var isAutoplayEnabled: Bool {
+        if UserDefaults.standard.object(forKey: "autoplayNext") == nil {
+            return true
+        }
+        return UserDefaults.standard.bool(forKey: "autoplayNext")
+    }
     private var pipController: AVPictureInPictureController?
     private var pipButton: UIButton!
     
@@ -402,6 +409,13 @@ class CustomMediaPlayerViewController: UIViewController, UIGestureRecognizerDele
         twoFingerTapGesture.numberOfTouchesRequired = 2
         twoFingerTapGesture.delegate = self
         view.addGestureRecognizer(twoFingerTapGesture)
+        
+        NotificationCenter.default.addObserver(
+            self,
+            selector: #selector(handlePlaybackEnded),
+            name: .AVPlayerItemDidPlayToEndTime,
+            object: player.currentItem
+        )
     }
     
     override func viewWillTransition(to size: CGSize, with coordinator: UIViewControllerTransitionCoordinator) {
@@ -466,6 +480,7 @@ class CustomMediaPlayerViewController: UIViewController, UIGestureRecognizerDele
             timeUpdateTimer.invalidate()
         }
         
+        NotificationCenter.default.removeObserver(self, name: .AVPlayerItemDidPlayToEndTime, object: nil)
         NotificationCenter.default.removeObserver(self)
         UIDevice.current.isBatteryMonitoringEnabled = false
         
@@ -2997,6 +3012,19 @@ class CustomMediaPlayerViewController: UIViewController, UIGestureRecognizerDele
             batteryLabel?.text = "N/A"
         }
     }
+    
+    @objc private func handlePlaybackEnded() {
+        guard isAutoplayEnabled else { return }
+        
+        Logger.shared.log("Playback ended, autoplay enabled - starting next episode", type: "Debug")
+        
+        DispatchQueue.main.asyncAfter(deadline: .now() + 1.0) { [weak self] in
+            self?.player.pause()
+            self?.dismiss(animated: true) { [weak self] in
+                self?.onWatchNext()
+            }
+        }
+    }
 }
 
 class GradientOverlayButton: UIButton {

Sora/Views/SettingsView/SettingsSubViews/SettingsViewPlayer.swift

@@ -205,6 +205,7 @@ struct SettingsViewPlayer: View {
     @AppStorage("doubleTapSeekEnabled") private var doubleTapSeekEnabled: Bool = false
     @AppStorage("skipIntroOutroVisible") private var skipIntroOutroVisible: Bool = true
     @AppStorage("pipButtonVisible") private var pipButtonVisible: Bool = true
+    @AppStorage("autoplayNext") private var autoplayNext: Bool = true
     
     @AppStorage("videoQualityWiFi") private var wifiQuality: String = VideoQualityPreference.defaultWiFiPreference.rawValue
     @AppStorage("videoQualityCellular") private var cellularQuality: String = VideoQualityPreference.defaultCellularPreference.rawValue
@@ -247,6 +248,13 @@ struct SettingsViewPlayer: View {
                         showDivider: true
                     )
                     
+                    SettingsToggleRow(
+                        icon: "play.circle.fill",
+                        title: NSLocalizedString("Autoplay Next", comment: ""),
+                        isOn: $autoplayNext,
+                        showDivider: true
+                    )
+                    
                     SettingsPickerRow(
                         icon: "timer",
                         title: NSLocalizedString("Completion Percentage", comment: ""),