Linemode: custom permissions and size function.

[pavvd]

Based on docs https://yazi-rs.github.io/docs/configuration/yazi#manager.linemode

function Linemode:permissions_and_size()
    local perms = self._file.cha:perm() or "-"
    
    local size_str
    local size = self._file:size()
    if size then
        size_str = ya.readable_size(size)
    else
        -- file count for dirs
        local folder = cx.active:history(self._file.url)
        size_str = folder and tostring(#folder.files) or "-"
    end
    local size_formatted = string.format("%6s", size_str)
    
    return string.format("%s  %s", perms, size_formatted)
end