fix: persistent fullscreen window — never destroy AVPlayerView

Root cause: every fullscreen exit destroyed the AVPlayerView, triggering
CoreMedia's FigNotificationCenterRemoveWeakListeners which races with
the main thread's autorelease pool drain. No amount of nil-ing the
player reference or delaying the close could prevent this race.

Solution: the fullscreen NSWindow + AVPlayerView are created ONCE on
first use and never destroyed. Toggle uses orderFront/orderOut instead
of makeKeyAndOrderFront/close. The AVPlayerView stays alive for the
entire app lifetime, so CoreMedia teardown never happens during toggle.

Also:
- Removed onDisappear { bridge.cleanup() } — cleanup during app
  termination races with autorelease pool drain. Process exit handles
  all teardown correctly.
- Double-click exit uses DispatchQueue.main.async to avoid calling
  toggleFullscreen from inside the event monitor callback.
- isReleasedWhenClosed = false on fullscreen window

Sources/MiniPlayerApp.swift

@@ -11,7 +11,6 @@ struct MiniPlayerApp: App {
             ContentView(bridge: bridge)
                 .frame(minWidth: 900, minHeight: 600)
                 .onAppear { bridge.setup() }
-                .onDisappear { bridge.cleanup() }
         }
         #if os(macOS)
         .commands {

Sources/PlayerBridge.swift

@@ -278,68 +278,68 @@ final class PlayerBridge: ObservableObject {
     }
     
     // MARK: - 全屏（视频内容全屏，非窗口全屏）
+    // 全屏窗口只创建一次，之后只用 orderFront/orderOut 切换显示
+    // AVPlayerView 永不销毁，彻底避免 CoreMedia weak listener 竞态
     func toggleFullscreen() {
         #if os(macOS)
-        if let fw = fullscreenWindow {
-            // 移除事件监控
+        if isFullscreen {
+            // 退出全屏：只隐藏窗口，不销毁
+            fullscreenWindow?.orderOut(nil)
+            isFullscreen = false
             if let monitor = fullscreenEventMonitor {
                 NSEvent.removeMonitor(monitor)
                 fullscreenEventMonitor = nil
             }
-            // 先断开 player 引用再关闭窗口
-            if let playerView = fw.contentView as? AVPlayerView {
-                playerView.player = nil
-            }
-            fw.close()
-            fullscreenWindow = nil
-            isFullscreen = false
             NSApp.activate(ignoringOtherApps: true)
             return
         }
         
-        guard let screen = NSScreen.main else { return }
-        let win = NSWindow(contentRect: screen.frame, styleMask: .borderless, backing: .buffered, defer: false)
-        win.level = .screenSaver
-        win.backgroundColor = .black
-        win.collectionBehavior = [.canJoinAllSpaces, .fullScreenAuxiliary]
-        win.hasShadow = false
+        // 首次全屏：创建窗口和 AVPlayerView（仅此一次）
+        if fullscreenWindow == nil {
+            guard let screen = NSScreen.main else { return }
+            let win = NSWindow(contentRect: screen.frame, styleMask: .borderless, backing: .buffered, defer: false)
+            win.level = .screenSaver
+            win.backgroundColor = .black
+            win.collectionBehavior = [.canJoinAllSpaces, .fullScreenAuxiliary]
+            win.hasShadow = false
+            win.isReleasedWhenClosed = false
+            
+            let playerView = AVPlayerView(frame: screen.frame)
+            playerView.player = player
+            playerView.controlsStyle = .none
+            playerView.videoGravity = .resizeAspect
+            win.contentView = playerView
+            fullscreenWindow = win
+        }
         
-        // 使用系统 AVPlayerView，Apple 内部处理所有 CoreMedia 生命周期竞态
-        let playerView = AVPlayerView(frame: screen.frame)
-        playerView.player = player
-        playerView.controlsStyle = .none
-        playerView.videoGravity = .resizeAspect
-        win.contentView = playerView
-        win.makeKeyAndOrderFront(nil)
+        fullscreenWindow?.makeKeyAndOrderFront(nil)
         NSApp.activate(ignoringOtherApps: true)
-        fullscreenWindow = win
         isFullscreen = true
         
-        // 添加本地事件监控：双击退出全屏、单击暂停/播放、Escape退出
-        fullscreenEventMonitor = NSEvent.addLocalMonitorForEvents(matching: [.leftMouseDown, .keyDown]) { [weak self] event in
-            guard let self = self, let fw = self.fullscreenWindow else { return event }
-            // 只处理全屏窗口内的事件
-            if event.window !== fw { return event }
-            
-            if event.type == .leftMouseDown {
-                if event.clickCount >= 2 {
-                    self.toggleFullscreen()
-                    return nil // 消费事件
-                } else {
-                    if self.player.timeControlStatus == .playing {
-                        self.player.pause()
+        // 事件监控：双击退出、单击暂停/播放、Escape退出
+        if fullscreenEventMonitor == nil {
+            fullscreenEventMonitor = NSEvent.addLocalMonitorForEvents(matching: [.leftMouseDown, .keyDown]) { [weak self] event in
+                guard let self = self, self.isFullscreen else { return event }
+                guard event.window === self.fullscreenWindow else { return event }
+                
+                if event.type == .leftMouseDown {
+                    if event.clickCount >= 2 {
+                        DispatchQueue.main.async { self.toggleFullscreen() }
+                        return nil
                     } else {
-                        self.player.play()
+                        if self.player.timeControlStatus == .playing {
+                            self.player.pause()
+                        } else {
+                            self.player.play()
+                        }
+                        return nil
                     }
+                } else if event.type == .keyDown && event.keyCode == 53 {
+                    DispatchQueue.main.async { self.toggleFullscreen() }
                     return nil
                 }
-            } else if event.type == .keyDown {
-                if event.keyCode == 53 { // Escape
-                    self.toggleFullscreen()
-                    return nil
-                }
+                return event
             }
-            return event
         }
         #endif
     }
@@ -437,24 +437,19 @@ final class PlayerBridge: ObservableObject {
         player.pause()
         
         #if os(macOS)
-        // 移除全屏事件监控
+        // 移除全屏事件监控（不销毁窗口，避免 teardown 竞态）
         if let monitor = fullscreenEventMonitor {
             NSEvent.removeMonitor(monitor)
             fullscreenEventMonitor = nil
         }
-        // 关闭全屏窗口
-        if let fw = fullscreenWindow {
-            if let pv = fw.contentView as? AVPlayerView { pv.player = nil }
-            fw.close()
-            fullscreenWindow = nil
-        }
+        fullscreenWindow?.orderOut(nil)
         #endif
         
         // 1. 先停 Timer
         updateTimer?.invalidate()
         updateTimer = nil
         
-        // 2. 移除 KVO 观察者（阻止后续回调）
+        // 2. 移除 KVO 观察者
         itemStatusObserver?.invalidate(); itemStatusObserver = nil
         
         // 3. 移除通知观察者