Fix move to existing list: sync_queue list_id update + PickList filter

- update_list_id now also updates sync_queue table
- PickList filters out local-only UUID lists (only shows server IDs)

src/infrastructure/db.rs

@@ -336,6 +336,10 @@ impl Db {
             "UPDATE tasks SET list_id = ?1 WHERE list_id = ?2",
             params![new_id, old_id],
         )?;
+        conn.execute(
+            "UPDATE sync_queue SET list_id = ?1 WHERE list_id = ?2",
+            params![new_id, old_id],
+        )?;
         Ok(())
     }