ffmpeg libwebp quality=85 compression_level=6.
Total: 11.8MB → 875KB (~11MB saved). Visually indistinguishable on
the card grid at the 9:16 image aspect.
PNG removals were already staged in the previous CommandTab commit;
this commit adds the 6 .webp replacements and points constants.js
imports at .webp.
Co-Authored-By: Claude Opus 4.7 (1M context) <noreply@anthropic.com>
