**Description** Allow users to modify their previously saved teams without having to delete and recreate them. Users should be able to load a saved team, add or remove Pokémon, and save the changes to the existing team. **Acceptance criteria** - Users can load an existing saved team. - Users can add and remove Pokémon from the loaded team. - Users can save changes to the existing team. - Updating a team preserves its ID and name unless the user explicitly changes the name. - Changes are persisted in the database. - Users can only update their own teams.