Perhaps use dedicated line feed Unicode codepoint instead of � U+FFFD in file/directory names

Continuing from https://github.com/gokcehan/lf/pull/2467#issuecomment-4154336040, it would be great if for LF, ␊ (from `bat`) or ␤ (from `fish`) is used. Related to (and is part of) https://github.com/gokcehan/lf/issues/1114.