This commit introduces a new action, `batch_apply_chunk`, to facilitate chunked processing of batch assignments in the bib management system. It enhances the AJAX handling for batch operations, allowing for better progress tracking and user feedback during the assignment process. Additionally, new JavaScript functions are added to manage batch progress display, and CSS styles are updated to support the new loading indicators. The version code is incremented to reflect these changes, aiming to improve user experience and efficiency in batch processing.