Merge pull request #722 from yhs0602/copilot/fix-crash-report-issues

Prevent `FileItem` lazy delegate serialization crash in file chooser result flow

Author: yhs0602

app/src/main/java/com/kyhsgeekcode/filechooser/model/FileItem.kt

@@ -54,6 +54,7 @@ open class FileItem : Serializable {
     var file: File? = null // 항목이 의미하는 파일 자체
 //    protected var backFile: File? = null // 항목이 전개되었을 때 나타낼 디렉토리
 
+    @delegate:Transient
     private val isExpandable: Boolean by lazy {
         file?.isDirectory == true ||
                 file?.isArchive() == true ||