prompt: resolve stray merge-conflict markers from d53a2a9fc
Keep the upstream MatrixChunky8-measured notepat button logic;
drop the stashed one-liner that only set notepatX. This was
breaking the /prompt piece in production with SyntaxError: '<<'.
Co-Authored-By: Claude Opus 4.7 (1M context) <noreply@anthropic.com>