Version 2.0 turns Journal Impact Factor into a full offline journal-metrics workspace.

- Added Explore, Compare, Favorites, and Top 100 views
- Search 20,449 journals locally with faster results
- Open richer journal detail pages with impact factor, 5-year IF, quartile, CAS block, ISSN, publisher, category, region, and rank context
- Compare journals side by side before choosing a submission target
- Improved favorite migration for journals that share an ISSN
- Added clearer error handling if the local metrics dataset is unavailable