feat(idaa): sort BB posts by most recent activity

- Refactored lq__post_obj_li to perform in-memory descending sort by updated_on/created_on.
- Ensured newest and recently modified posts appear at the top of the list.
- Hardened reactivity for Svelte 5 stability.

src/routes/idaa/(idaa)/bb/+page.svelte

@@ -69,6 +69,14 @@
                     return archiveDate > now;
                 })
                 .toArray();
+
+            // SORT: Most recently updated or created at the top (Refactored 2026-02-05)
+            results.sort((a, b) => {
+                const date_a = new Date(a.updated_on ?? a.created_on).getTime();
+                const date_b = new Date(b.updated_on ?? b.created_on).getTime();
+                return date_b - date_a;
+            });
+
             return results;
         });
     });