fix(org-drill): route drill-refile targets through the validated helper

The prior fix listed drill files with a raw directory-files call, bypassing cj/--drill-files-or-error, the shared validated entry point the other drill commands use. That skipped the missing/unreadable-dir user-error, fell through silently on an empty dir, and included leading-dot .org files the module otherwise excludes. Route through cj/--drill-files-or-error + expand-file-name, keeping the let binding so the session-wide org-refile-targets still survives. The test is rewritten into three: validated-helper targets, no global clobber, and a user-error on a missing drill dir.

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