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Generates a 3-row sample CSV client-side (Blob) so users see the exact src_login,src_pass,dst_login,dst_pass layout instead of a plain caption. Co-Authored-By: Claude Opus 4.8 (1M context) <noreply@anthropic.com> Claude-Session: https://claude.ai/code/session_01MMHQTtnQtQqL8muAXHr9kd