fix: list_messages returns newest N (was returning oldest N)

src/tracker/api/messages.py

@@ -94,9 +94,12 @@ async def list_messages(
     if not parent_id and (chat_id or task_id):
         q = q.where(Message.parent_id.is_(None))
 
-    q = q.order_by(Message.created_at).offset(offset).limit(limit)
+    # Get newest N messages (DESC), then reverse to chronological order
+    q = q.order_by(Message.created_at.desc()).offset(offset).limit(limit)
     result = await db.execute(q)
-    return [_message_out(m) for m in result.scalars()]
+    messages = [_message_out(m) for m in result.scalars()]
+    messages.reverse()
+    return messages
 
 
 @router.post("/messages", response_model=MessageOut)