Files with ~syncthing~ prefix are temporary files.
Desktop Sync never writes directly to a destination file, but instead, all changes are made to a temporary copy which
is then moved in place over the old version.
If an error occurs during the copying or syncing, such as a necessary block not being available,
the temporary file is kept around for up to a day. This is to avoid needlessly requesting data over the network.
Sync doesn’t process zero byte file and it’s fine to delete them manually since they are temporary copies.
