The default OpenGraph card carried Stream.place copy and the bundled banner regardless of branding. Its title, site name and description now come from siteTitle and siteDescription, and /linkbanner.png serves a new linkBanner branding asset (PNG/JPEG/WebP up to 2MB, 1200x630 suggested) with its real content type, falling back to the bundled banner. The Branding screen gains an upload row for it. Claude-Session: https://claude.ai/code/session_014aPQ5yqG9QFxKnbwQfCYKa