`read_cmdstan_csv` fails with unhelpful error if tilde expansion is needed (linux)

[katrinabrock]

Describe the bug
If read_cmdstan_csv is provided a path to a valid csv that requires tilde expansion e.g. ~/my-project/mycsv.csv, it fails with an error like:

grep: ~/my-project/mycsv.csv: No such file or directory
grep: ~/my-project/mycsv.csv: No such file or directory
Error in dimnames(x) <- `*vtmp*` : 
  length of 'dimnames' [3] not equal to array extent`

which does not indicate to the user that the tilde was the problem.

To Reproduce
Steps to reproduce the behavior.
Take a working csv. run read_cmdstan_csv with absolute or relative path - success, with path including tilde - fail

E.g.

• cmdstanr::read_cmdstan_csv('/home/myusername/my-project/mycsv.csv') - works
• cmdstanr::read_cmdstan_csv('./mycsv.csv') - works
• cmdstanr::read_cmdstan_csv('~/my-project/mycsv.csv') - fails

Expected behavior
Tilde expansion correctly occurs.

Operating system
Your operating system (e.g. mac os x 10.15, windows 10, etc.)
Ubuntu 24.04.2 LTS

CmdStanR version number
Your CmdStanR version number (e.g. from packageVersion("cmdstanr")).
‘0.9.0.9000’ issue both on latest version in runiverse and in master.

Additional context

grep --version
grep (GNU grep) 3.11
Copyright (C) 2023 Free Software Foundation, Inc.
License GPLv3+: GNU GPL version 3 or later <https://gnu.org/licenses/gpl.html>.
This is free software: you are free to change and redistribute it.
There is NO WARRANTY, to the extent permitted by law.

Written by Mike Haertel and others; see
<https://git.savannah.gnu.org/cgit/grep.git/tree/AUTHORS>.

I found where there issue is and will make a PR later today.
cc @sonyaofthejungle