Support drag-and-drop files from the SFTP pane to the local system

os: windows 10

Thank you for developing such a useful tool. I used to use MobaXTerm, but now I'm starting to use this one. During the use, I found that WindTerm supports dragging files from the local to the remote sftp panel, but does not support dragging files from the remote sftp panelto the local one.

Can you add this convenient feature?

Start at the SFTP pane's existing local-to-remote drag-and-drop entry point and trace how Windows file drops are handled. Add the reverse remote-to-local flow, with completion shown by dragging a remote file to the local system and receiving the expected file.

Written by the indexing model from the issue text.