The icon used the wide galloping lockup, which turns into an unreadable
smear at provider-icon size. Use Hoplite's square brand mark instead,
verbatim from Hoplite's mobile app (`assets/brand/hoplite-mark.svg`, the
`HorseMark` cut its branding page reserves for tiles), for both the
built-in plugin and the ACP catalog entry. Refresh the QA screenshots.
Co-Authored-By: Claude Opus 5.5 <noreply@anthropic.com>