fix(transfer): enqueue full destination path instead of directory

Queued transfers stored only the destination directory as the target
path. Downstream upload logic treats the queued destination as the full
file path and passes it straight to create_file, so transfers failed
with a Failure error when the remote target resolved to a directory.

Append each entry's file name to the destination directory at enqueue
time in both enqueue_file and enqueue_all, matching the single-file
transfer path which already builds the full target path.

src/ui/activities/filetransfer.rs

@@ -355,7 +355,12 @@ impl FileTransferActivity {
             self.browser.explorer_mut().dequeue(&src);
         } else {
             debug!("Marking file {}", src.display());
-            let dest = self.browser.other_explorer_no_found().wrkdir.clone();
+            // Destination is the other pane's working directory joined with the file
+            // name, so the queued entry holds the full target path (not just the dir).
+            let mut dest = self.browser.other_explorer_no_found().wrkdir.clone();
+            if let Some(name) = src.file_name() {
+                dest.push(name);
+            }
             self.browser.explorer_mut().enqueue(&src, &dest);
         }
         self.reload_browser_file_list();