fix(post ids): avoid cid fallback for poster identity

src/lib/utils/__tests__/author-post-counts.test.ts

@@ -27,14 +27,14 @@ describe('getThreadPostCountsByAuthor', () => {
     expect(counts.get('author-b')).toBe(2);
   });
 
-  it('uses cid fallback for comments without author metadata', () => {
+  it('skips comments without author metadata', () => {
     const counts = getThreadPostCountsByAuthor(
       { cid: 'post-1', author: { shortAddress: 'author-a' } } as any,
       [{ cid: 'reply-1' }, { author: { shortAddress: 'author-b' } }] as any[],
     );
 
     expect(counts.get('author-a')).toBe(1);
-    expect(counts.get('reply-1')).toBe(1);
+    expect(counts.has('reply-1')).toBe(false);
     expect(counts.has('author-b')).toBe(false);
   });
 });

src/lib/utils/__tests__/comment-user-id-utils.test.ts

@@ -0,0 +1,13 @@
+import { describe, expect, it } from 'vitest';
+import { getCommentUserID } from '../comment-user-id-utils';
+
+describe('getCommentUserID', () => {
+  it('uses resolved author identity data for per-post user IDs', () => {
+    expect(getCommentUserID({ author: { address: 'poster.bso', shortAddress: 'short-poster' } } as any)).toBe('poster.bso');
+    expect(getCommentUserID({ author: { shortAddress: 'short-poster' } } as any)).toBe('short-poster');
+  });
+
+  it('does not fall back to the comment cid while author metadata is missing', () => {
+    expect(getCommentUserID({ cid: 'QmQU6BiPkB77b3rAkdj973ptTp5A6X77tfPrwTvCQDL9cq' } as any)).toBe('');
+  });
+});

src/lib/utils/comment-user-id-utils.ts

@@ -3,5 +3,5 @@ import getShortAddress from '../get-short-address';
 
 export function getCommentUserID(comment: Comment | undefined): string {
   const { address, shortAddress } = comment?.author || {};
-  return (address ? getShortAddress(address) : '') || shortAddress || comment?.cid || '';
+  return (address ? getShortAddress(address) : '') || shortAddress || '';
 }