fix: correct Memos links and author identities

lib/display.ts

@@ -2,15 +2,16 @@ export type AuthorDisplay = {
   origin: string;
   username: string;
   name: string | null;
+  remote_user?: string | null;
   remote_display_name?: string | null;
   source_base_url: string | null;
 };
 
 export function postAuthorLabel(post: AuthorDisplay) {
-  const linkedMemos = post.origin === "memos" || post.origin === "hub";
-  const author = linkedMemos ? (post.remote_display_name || post.name || post.username) : (post.name || post.username);
-  if (linkedMemos && post.source_base_url) {
+  const remoteUser = post.remote_user?.split("/").filter(Boolean).at(-1);
+  const author = remoteUser || (post.origin === "rss" ? post.name : post.username) || post.name || "unknown";
+  if (post.source_base_url) {
     try { return `@${author}@${new URL(post.source_base_url).hostname}`; } catch { /* Keep a readable fallback for legacy malformed URLs. */ }
   }
-  return `@${author}${post.name ? ` · ${post.name}` : ""}`;
+  return `@${author}`;
 }