- Introduced `{field|auto}` placeholder in message formats to fill remaining characters up to `max_message_length`, improving message customization.
- Implemented logic in `FeedManager` to handle multiple `{field|auto}` placeholders, logging a warning if more than one is present.
- Updated `BotDataViewer` to utilize the new auto field feature, ensuring compatibility with existing message formatting.
- Added unit tests to validate the behavior of the new auto field functionality, including handling of message length constraints and multiple placeholders.