Add a report mode selector in index.html and update script.js to process and ZIP files based on the selected mode.

Add logic to mark file progress text as "completed" when reaching 100%, applying a green color for visual feedback.
Update CSS to use grid layout for better alignment of progress items and smooth color transitions.

Introduces progress bars and percentage indicators to display both total and per-file progress during CSV processing. Enhances user feedback and visibility into processing status.

Replaced external PapaParse and JSZip CDN references with local copies in the lib directory to improve offline availability and reduce dependency on external sources.