Add Bulk Import, Following, Incomplete, status overhaul, performance, and CBR fixes
- Bulk Import page: filename pattern parsing, shared metadata, duplicate detection (volume-aware), batch upload with progress
- Following page: track external author URLs; authors table; sidebar counter
- Incomplete view: non-archived books with publication_status ≠ Complete
- Status: added Temporary Hold, renamed Hiatus → Long-Term Hold; statusBadgeHtml() helper
- Status/want-to-read badges: dark fill + ring for readability on any cover colour
- Disk usage warning in sidebar (amber/red thresholds)
- Bulk delete batched via POST /library/bulk-delete
- CBR: magic bytes format detection + py7zr 7-zip support; unrar → proprietary unrar v6
- Performance: IntersectionObserver lazy covers, ETag 304, single DOM pass, json_agg tags
- Duplicate detection in library and Convert page warning
- All books Grid/List toggle; star ratings; reader text colour presets; bookmarks
- Docs: TECHNICAL.md and changelog updated
Co-Authored-By: Claude Sonnet 4.6 <noreply@anthropic.com>
Ivo Oskamp
b43366723c