prompt: fix notepat button icon/label overlap
MatrixChunky8 space advance is 2px (proportional), not 4px as the
comment assumed, so 4 leading spaces only reserved 8px while the 13×9
piano icon frame extends to box.x+14. Bumped to 8 spaces so "notepat"
starts at box.x+18 with a 3px gap after the icon.
Co-Authored-By: Claude Opus 4.7 (1M context) <noreply@anthropic.com>