fix the author in the publication cards

src/lib/components/publications/PublicationHeader.svelte

@@ -35,7 +35,7 @@
 
   let title: string = $derived(event.getMatchingTags("title")[0]?.[1]);
   let author: string = $derived(
-    event.getMatchingTags(event, "author")[0]?.[1] ?? "unknown",
+    event.getMatchingTags("author")[0]?.[1] ?? "unknown",
   );
   let version: string = $derived(
     event.getMatchingTags("version")[0]?.[1] ?? "1",

src/lib/components/util/Details.svelte

@@ -62,7 +62,7 @@
     <div class="flex flex-row justify-between items-center">
       <!-- Index author badge -->
       <P class="text-base font-normal"
-        >{@render userBadge(event.pubkey, author)}</P
+        >{@render userBadge(event.pubkey, undefined)}</P
       >
       <CardActions {event}></CardActions>
     </div>