Release v1.6.0: Citations Enhancement Complete

Phase 2: Citations Library (zbib-style)
- Multi-citation management with save, sort, filter, search
- Export to TXT, BibTeX, RIS, CSV, JSON formats
- Citation style switching (APA, MLA, Chicago, Harvard)

Phase 2.5: Batch Processing Improvements
- Content summaries instead of job stats
- Inline citations display on batch processing page
- Zero navigation workflow

Phase 3: Citation-to-Evidence Workflow
- Citation-to-evidence modal with pre-filled fields
- Evidence Collector API integration
- Streamlined research-to-evidence pipeline