The dashboard screenshot uses a relative path `src="whatsapp-openclaw.jpg"`
which resolves correctly on the English root page but produces 404 on
zh-CN and ja-JP pages because Mintlify prepends the language subdirectory
to the CDN path.
Change to absolute path `/whatsapp-openclaw.jpg` in all three index files,
consistent with other images on the same page that already use absolute
paths (e.g. `/assets/openclaw-logo-text-dark.png`).
