Unlinked References doesnt work if the org-roam-directory has a space in it.

[vikram-mandyam]

Description

In the function org-roam-unlinked-references-section the org-roam-directory variable is concated to form the rg_command. This doesn't cover any spaces in the org-roam-directory path.
So if the path is /Users/user123/MyDrive/My Files/org-mode/org-roam, due to the space in My Files rg returns an error:

rg: /Users/user123/MyDrive/My: No such file or directory (os error 2)
rg: Files/org-mode/org-roam: No such file or directory (os error 2)

This is due to the lines here:

           (rg-command (concat "rg -L -o --vimgrep -P -i "
                               (mapconcat (lambda (glob) (concat "-g " glob))
                                          (org-roam--list-files-search-globs org-roam-file-extensions)
                                          " ")
                               (format " '\\[([^[]]++|(?R))*\\]%s' "
                                       (mapconcat (lambda (title)
                                                    (format "|(\\b%s\\b)" (shell-quote-argument title)))
                                                  titles ""))
                               org-roam-directory))

Steps to Reproduce

Set the org-roam-directory to a directory containing spaces like shown above.

org-roam-diagnostics

Copy info below this line into issue:

• Emacs: GNU Emacs 28.2 (build 2, aarch64-apple-darwin23.2.0, NS appkit-2487.30 Version 14.2.1 (Build 23C71))
  of 2024-01-09
• Framework: N/A
• Org: Org mode version 9.4.6 (9.4.6-796-ge68375.dirty-elpa @ ....)
• Org-roam: 2.2.2- sqlite-connector: sqlite

[vikram-mandyam]

I have created a pull request for fixing this - please have a look #2411