fix: full fediverse handle display + follower count includes remote

thoughts-frontend/lib/utils.ts

@@ -6,6 +6,17 @@ export function cn(...inputs: ClassValue[]) {
   return twMerge(clsx(inputs))
 }
 
+/** Construct a full fediverse handle like `user@instance.social`.
+ *  Falls back gracefully for existing DB rows that only stored the username. */
+export function fullFediverseHandle(handle: string, actorUrl: string): string {
+  if (handle.includes("@")) return handle;
+  try {
+    return `${handle}@${new URL(actorUrl).hostname}`;
+  } catch {
+    return handle;
+  }
+}
+
 export function buildThoughtThreads(thoughts: Thought[]): ThoughtThreadType[] {
   const thoughtMap = new Map<string, Thought>();
   thoughts.forEach((t) => thoughtMap.set(t.id, t));