Clarify ignored directory fsync cleanup errors

Assisted-by: GitHub Copilot (model: MAI-Code-1-Flash, autonomous)
Co-authored-by: Copilot App <223556219+Copilot@users.noreply.github.com>

Author: mnriem

src/specify_cli/extensions/__init__.py

@@ -142,6 +142,7 @@ def _fsync_directory(path: Path) -> None:
         try:
             os.close(dir_fd)
         except OSError:
+            # Cleanup after an fsync failure should not mask the original error.
             pass