fix: collectino post background

internal/repository/collection_repo.go

@@ -200,7 +200,10 @@ func (r *CollectionRepo) CollectionsContaining(ctx context.Context, postID, user
 	return ids, rows.Err()
 }
 
-// PostsIn returns the posts (with images + author) inside a collection.
+// PostsIn returns the posts inside a collection, ordered by collection
+// position then added_at. Images are NOT hydrated — call
+// PostRepo.ImagesFor on the returned ids if your caller renders the
+// post visually. The CollectionService.Get path already does this.
 func (r *CollectionRepo) PostsIn(ctx context.Context, collectionID string) ([]model.Post, error) {
 	rows, err := r.pg.Pool.Query(ctx, `
 		SELECT p.id, p.user_id, p.caption, p.source_url, COALESCE(p.source_title, ''),
@@ -234,8 +237,6 @@ func (r *CollectionRepo) PostsIn(ctx context.Context, collectionID string) ([]mo
 	if err := rows.Err(); err != nil {
 		return nil, fmt.Errorf("iterate collection posts: %w", err)
 	}
-	// Defer image hydration to caller via PostRepo if needed; for v1 we just
-	// return without images here (the management page can fetch separately).
 	return posts, nil
 }