feat(fs): delegate win --server file reading to CM (#13736)

- Route Windows server-to-client file reads through CM instead of the connection layer
- Add FS IPC commands (ReadFile, CancelRead, SendConfirmForRead, ReadAllFiles) and CM data messages
  (ReadJobInitResult, FileBlockFromCM, FileReadDone, FileReadError, FileDigestFromCM, AllFilesResult)
- Track pending read validations and read jobs to coordinate CM-driven file transfers and clean them up
  on completion, cancellation, and errors
- Enforce a configurable file-transfer-max-files limit for ReadAllFiles and add stronger file name/path
  validation on the CM side
- Improve Flutter file transfer UX and robustness:
  - Use explicit percent/percentText progress fields
  - Derive speed and cancel actions from the active job
  - Handle job errors via FileModel.handleJobError and complete pending recursive tasks on failure
  - Wrap recursive directory operations in try/catch and await sendRemoveEmptyDir when removing empty directories

Signed-off-by: fufesou <linlong1266@gmail.com>

flutter/lib/desktop/pages/file_manager_page.dart

@@ -282,11 +282,9 @@ class _FileManagerPageState extends State<FileManagerPage>
                                     item.state != JobState.inProgress,
                                 child: LinearPercentIndicator(
                                   animateFromLastPercent: true,
-                                  center: Text(
-                                    '${(item.finishedSize / item.totalSize * 100).toStringAsFixed(0)}%',
-                                  ),
+                                  center: Text(item.percentText),
                                   barRadius: Radius.circular(15),
-                                  percent: item.finishedSize / item.totalSize,
+                                  percent: item.percent,
                                   progressColor: MyTheme.accent,
                                   backgroundColor: Theme.of(context).hoverColor,
                                   lineHeight: kDesktopFileTransferRowHeight,

flutter/lib/mobile/pages/file_manager_page.dart

@@ -355,15 +355,21 @@ class _FileManagerPageState extends State<FileManagerPage> {
         return Offstage();
       }
 
-      switch (jobTable.last.state) {
+      // Find the first job that is in progress (the one actually transferring data)
+      // Rust backend processes jobs sequentially, so the first inProgress job is the active one
+      final activeJob = jobTable
+              .firstWhereOrNull((job) => job.state == JobState.inProgress) ??
+          jobTable.last;
+
+      switch (activeJob.state) {
         case JobState.inProgress:
           return BottomSheetBody(
             leading: CircularProgressIndicator(),
             title: translate("Waiting"),
             text:
-                "${translate("Speed")}:  ${readableFileSize(jobTable.last.speed)}/s",
+                "${translate("Speed")}:  ${readableFileSize(activeJob.speed)}/s",
             onCanceled: () {
-              model.jobController.cancelJob(jobTable.last.id);
+              model.jobController.cancelJob(activeJob.id);
               jobTable.clear();
             },
           );
@@ -371,7 +377,7 @@ class _FileManagerPageState extends State<FileManagerPage> {
           return BottomSheetBody(
             leading: Icon(Icons.check),
             title: "${translate("Successful")}!",
-            text: jobTable.last.display(),
+            text: activeJob.display(),
             onCanceled: () => jobTable.clear(),
           );
         case JobState.error:

flutter/lib/models/cm_file_model.dart

@@ -275,7 +275,7 @@ class TransferJobSerdeData {
       : this(
           connId: d['connId'] ?? 0,
           id: int.tryParse(d['id'].toString()) ?? 0,
-          path: d['path'] ?? '',
+          path: d['dataSource'] ?? '',
           isRemote: d['isRemote'] ?? false,
           totalSize: d['totalSize'] ?? 0,
           finishedSize: d['finishedSize'] ?? 0,

flutter/lib/models/file_model.dart

@@ -113,6 +113,34 @@ class FileModel {
     fileFetcher.tryCompleteEmptyDirsTask(evt['value'], evt['is_local']);
   }
 
+  // This method fixes a deadlock that occurred when the previous code directly
+  // called jobController.jobError(evt) in the job_error event handler.
+  //
+  // The problem with directly calling jobController.jobError():
+  //   1. fetchDirectoryRecursiveToRemove(jobID) registers readRecursiveTasks[jobID]
+  //      and waits for completion
+  //   2. If the remote has no permission (or some other errors), it returns a FileTransferError
+  //   3. The error triggers job_error event, which called jobController.jobError()
+  //   4. jobController.jobError() calls getJob(jobID) to find the job in jobTable
+  //   5. But addDeleteDirJob() is called AFTER fetchDirectoryRecursiveToRemove(),
+  //      so the job doesn't exist yet in jobTable
+  //   6. Result: jobController.jobError() does nothing useful, and
+  //      readRecursiveTasks[jobID] never completes, causing a 2s timeout
+  //
+  // Solution: Before calling jobController.jobError(), we first check if there's
+  // a pending readRecursiveTasks with this ID and complete it with the error.
+  void handleJobError(Map<String, dynamic> evt) {
+    final id = int.tryParse(evt['id']?.toString() ?? '');
+    if (id != null) {
+      final err = evt['err']?.toString() ?? 'Unknown error';
+      fileFetcher.tryCompleteRecursiveTaskWithError(id, err);
+    }
+    // Always call jobController.jobError(evt) to ensure all error events are processed,
+    // even if the event does not have a valid job ID. This allows for generic error handling
+    // or logging of unexpected errors.
+    jobController.jobError(evt);
+  }
+
   Future<void> postOverrideFileConfirm(Map<String, dynamic> evt) async {
     evtLoop.pushEvent(
         _FileDialogEvent(WeakReference(this), FileDialogType.overwrite, evt));
@@ -591,8 +619,21 @@ class FileController {
       } else if (item.isDirectory) {
         title = translate("Not an empty directory");
         dialogManager?.showLoading(translate("Waiting"));
-        final fd = await fileFetcher.fetchDirectoryRecursiveToRemove(
-            jobID, item.path, items.isLocal, true);
+        final FileDirectory fd;
+        try {
+          fd = await fileFetcher.fetchDirectoryRecursiveToRemove(
+              jobID, item.path, items.isLocal, true);
+        } catch (e) {
+          dialogManager?.dismissAll();
+          final dm = dialogManager;
+          if (dm != null) {
+            msgBox(sessionId, 'custom-error-nook-nocancel-hasclose',
+                translate("Error"), e.toString(), '', dm);
+          } else {
+            debugPrint("removeAction error msgbox failed: $e");
+          }
+          return;
+        }
         if (fd.path.isEmpty) {
           fd.path = item.path;
         }
@@ -606,7 +647,7 @@ class FileController {
               item.name,
               false);
           if (confirm == true) {
-            sendRemoveEmptyDir(
+            await sendRemoveEmptyDir(
               item.path,
               0,
               deleteJobId,
@@ -647,7 +688,7 @@ class FileController {
             // handle remove res;
             if (item.isDirectory &&
                 res['file_num'] == (entries.length - 1).toString()) {
-              sendRemoveEmptyDir(item.path, i, deleteJobId);
+              await sendRemoveEmptyDir(item.path, i, deleteJobId);
             }
           } else {
             jobController.updateJobStatus(deleteJobId,
@@ -660,7 +701,7 @@ class FileController {
                 final res = await jobController.jobResultListener.start();
                 if (item.isDirectory &&
                     res['file_num'] == (entries.length - 1).toString()) {
-                  sendRemoveEmptyDir(item.path, i, deleteJobId);
+                  await sendRemoveEmptyDir(item.path, i, deleteJobId);
                 }
               }
             } else {
@@ -755,9 +796,9 @@ class FileController {
         fileNum: fileNum);
   }
 
-  void sendRemoveEmptyDir(String path, int fileNum, int actId) {
+  Future<void> sendRemoveEmptyDir(String path, int fileNum, int actId) async {
     history.removeWhere((element) => element.contains(path));
-    bind.sessionRemoveAllEmptyDirs(
+    await bind.sessionRemoveAllEmptyDirs(
         sessionId: sessionId, actId: actId, path: path, isRemote: !isLocal);
   }
 
@@ -1275,6 +1316,15 @@ class FileFetcher {
     }
   }
 
+  // Complete a pending recursive read task with an error.
+  // See FileModel.handleJobError() for why this is necessary.
+  void tryCompleteRecursiveTaskWithError(int id, String error) {
+    final completer = readRecursiveTasks.remove(id);
+    if (completer != null && !completer.isCompleted) {
+      completer.completeError(error);
+    }
+  }
+
   Future<List<FileDirectory>> readEmptyDirs(
       String path, bool isLocal, bool showHidden) async {
     try {
@@ -1438,6 +1488,10 @@ class JobProgress {
   var err = "";
   int lastTransferredSize = 0;
 
+  double get percent =>
+      totalSize > 0 ? (finishedSize.toDouble() / totalSize) : 0.0;
+  String get percentText => '${(percent * 100).toStringAsFixed(0)}%';
+
   clear() {
     type = JobType.none;
     state = JobState.none;

flutter/lib/models/model.dart

@@ -363,7 +363,7 @@ class FfiModel with ChangeNotifier {
           parent.target?.fileModel.refreshAll();
         }
       } else if (name == 'job_error') {
-        parent.target?.fileModel.jobController.jobError(evt);
+        parent.target?.fileModel.handleJobError(evt);
       } else if (name == 'override_file_confirm') {
         parent.target?.fileModel.postOverrideFileConfirm(evt);
       } else if (name == 'load_last_job') {