Add explicit non-handling of detached quotes in embed (#5156)

bskyembed/src/components/embed.tsx

@@ -158,6 +158,12 @@ export function Embed({
         return <Info>The quoted post is blocked.</Info>
       }
 
+      // Case 3.8: Detached quote post
+      if (AppBskyEmbedRecord.isViewDetached(record)) {
+        // Just don't show anything
+        return null
+      }
+
       // Unknown embed type
       return null
     }