Prefer opengraph image, fall back to Standard Site coverImage (#10694)

(cherry picked from commit b87a51b485)

src/lib/api/resolve.ts

@@ -246,6 +246,10 @@ async function resolveExternal(
     title: result.title ?? '',
     description: result.description ?? '',
     thumb: result.image ? await imageToThumb(result.image) : undefined,
+    /*
+     * New fields from Standard Site integration. Other fields are derived from
+     * opengraph/oembed as before.
+     */
     associatedRefs: result.associatedRefs,
     view: result.view,
   }

src/view/com/composer/ExternalEmbed.tsx

@@ -98,7 +98,8 @@ export const ExternalEmbedLink = ({
                 uri,
                 description:
                   data.view?.external?.description || data.description,
-                thumb: data.view?.external?.thumb || data.thumb?.source.path,
+                // prefer opengraph data to atproto record-derived image
+                thumb: data.thumb?.source.path || data.view?.external?.thumb,
               }}
             />
           )