- PDF extractor: rewrite from embedded bitmap extraction to caption-based
page region screenshots. Finds Figure/Table captions via regex,截取上方/下方
page region, handles compound figures and vector graphics.
- Upvote refresh: new crawler.refresh_upvotes() re-fetches upvotes for recent
N days without inserting new papers. Scheduler runs daily 30min after pipeline.
- Admin: add /admin/refresh-upvotes endpoint and dashboard button.
- UI: remove date quick nav, show upvote update time on detail/card pages,
clean up CSS date-chip styles.
- Utils: add recent_date_strs() helper.
Rain-Bus