fix: block app termination while recording is finalizing

- RecorderState.isFinalizing flag set during stopRecording → finishWriting
- applicationShouldTerminate returns .terminateLater if finalizing
- Shows alert '正在保存录制文件...' to inform user
- After save dialog completes, calls NSApp.reply(toApplicationShouldTerminate: true)
- All failure paths also check and resolve pendingTerminate
- Fixes: 9-min recording lost because user closed app before async finishWriting completed

Sources/MiniPlayerApp.swift

@@ -28,6 +28,22 @@ class AppDel: NSObject, NSApplicationDelegate {
         }
     }
     
+    func applicationShouldTerminate(_ sender: NSApplication) -> NSApplication.TerminateReply {
+        if RecorderState.isFinalizing {
+            NSLog("[MiniPlayer] ⏳ Termination blocked: recording is finalizing")
+            RecorderState.pendingTerminate = true
+            // 显示提示
+            let alert = NSAlert()
+            alert.messageText = "正在保存录制文件..."
+            alert.informativeText = "请等待录制保存完成后再关闭应用。"
+            alert.alertStyle = .informational
+            alert.addButton(withTitle: "确定")
+            alert.runModal()
+            return .terminateLater
+        }
+        return .terminateNow
+    }
+    
     func applicationShouldTerminateAfterLastWindowClosed(_ sender: NSApplication) -> Bool {
         return true
     }

Sources/PlayerRecorder.swift

@@ -162,6 +162,12 @@ private func tapProcessCallback(
 
 // MARK: - PlayerRecorder
 
+/// 全局状态：录制是否正在 finalize（阻止应用退出）
+enum RecorderState {
+    static nonisolated(unsafe) var isFinalizing: Bool = false
+    static nonisolated(unsafe) var pendingTerminate: Bool = false
+}
+
 /// 视频源录制器：AVPlayerItemVideoOutput 抓帧 + MTAudioProcessingTap 捕获音频
 /// 边录边写文件，录制结束后仅改名和移动
 @MainActor
@@ -287,6 +293,7 @@ final class PlayerRecorder: NSObject {
         guard isRecording else { return }
         isRecording = false
         isRunning = false
+        RecorderState.isFinalizing = true  // 阻止应用退出，直到 finishWriting 完成
         captureTimer?.invalidate()
         captureTimer = nil
         stopDurationTimer()
@@ -314,8 +321,14 @@ final class PlayerRecorder: NSObject {
         writer?.finishWriting { [weak self] in
             NSLog("[Recorder] finishWriting callback invoked")
             DispatchQueue.main.async {
+                RecorderState.isFinalizing = false  // 允许应用退出了
+                
                 guard let self = self, let w = self.writer else {
                     NSLog("[Recorder] ⚠️ self or writer is nil in finishWriting callback")
+                    if RecorderState.pendingTerminate {
+                        RecorderState.pendingTerminate = false
+                        NSApp.reply(toApplicationShouldTerminate: true)
+                    }
                     return
                 }
                 let vFrames = self.captureFrameCount
@@ -333,6 +346,7 @@ final class PlayerRecorder: NSObject {
                     } else {
                         NSLog("[Recorder] ⚠️ Temp file missing: %@", tempURL.path)
                         self.onError?("Recording file missing")
+                        self.checkPendingTerminate()
                     }
                 } else {
                     NSLog("[Recorder] ✗ finishWriting failed: status=%d, error=%@",
@@ -341,6 +355,7 @@ final class PlayerRecorder: NSObject {
                     if let url = self.tempURL {
                         try? FileManager.default.removeItem(at: url)
                     }
+                    self.checkPendingTerminate()
                 }
             }
         }
@@ -632,7 +647,13 @@ final class PlayerRecorder: NSObject {
         
         panel.begin { [weak self] response in
             Task { @MainActor in
-                guard let self = self else { return }
+                guard let self = self else {
+                    if RecorderState.pendingTerminate {
+                        RecorderState.pendingTerminate = false
+                        NSApp.reply(toApplicationShouldTerminate: true)
+                    }
+                    return
+                }
                 
                 if response == .OK, let finalURL = panel.url {
                     do {
@@ -653,9 +674,18 @@ final class PlayerRecorder: NSObject {
                     NSLog("[Recorder] User cancelled save, deleting temp file")
                     try? FileManager.default.removeItem(at: tempURL)
                 }
+                self.checkPendingTerminate()
             }
         }
     }
+    
+    private func checkPendingTerminate() {
+        if RecorderState.pendingTerminate {
+            RecorderState.pendingTerminate = false
+            NSLog("[MiniPlayer] Pending terminate triggered, replying to terminate")
+            NSApp.reply(toApplicationShouldTerminate: true)
+        }
+    }
 }
 
 #endif