fix: remove duplicate substance name from info response content

The name was included both as the Response title and as a bold header
in the content body, causing it to appear twice on all platforms.

Signed-off-by: Josephine Pfeiffer <hi@josie.lol>
Co-Authored-By: Claude Opus 4.6 <noreply@anthropic.com>
Signed-off-by: Josephine Pfeiffer <hi@josie.lol>