fix: show save dialog even on error if file has content; better default filename

Sources/PlayerRecorder.swift

@@ -73,9 +73,17 @@ final class PlayerRecorder: NSObject {
                 await MainActor.run {
                     RecorderState.isFinalizing = false
                     self?.stopDurationTimer()
-                    self?.onError?(error.localizedDescription)
-                    try? FileManager.default.removeItem(at: tempURL)
-                    self?.checkPendingTerminate()
+                    // 如果文件存在且有内容，仍然允许保存
+                    let attrs = try? FileManager.default.attributesOfItem(atPath: tempURL.path)
+                    let fileSize = (attrs?[.size] as? Int64) ?? 0
+                    if fileSize > 0 {
+                        NSLog("[Recorder] File exists with size %lld, offering save dialog", fileSize)
+                        self?.showSaveDialog(tempURL: tempURL)
+                    } else {
+                        self?.onError?(error.localizedDescription)
+                        try? FileManager.default.removeItem(at: tempURL)
+                        self?.checkPendingTerminate()
+                    }
                 }
             }
         }
@@ -122,7 +130,9 @@ final class PlayerRecorder: NSObject {
     private func showSaveDialog(tempURL: URL) {
         let panel = NSSavePanel()
         panel.allowedContentTypes = [.mpeg4Movie]
-        panel.nameFieldStringValue = tempURL.lastPathComponent
+        // 默认文件名去掉 temp_ 前缀
+        let defaultName = tempURL.lastPathComponent.replacingOccurrences(of: "temp_", with: "")
+        panel.nameFieldStringValue = defaultName
         panel.directoryURL = saveDirectory
 
         panel.begin { [weak self] response in