vNext: reading streaks, goals, richer book model, multiple authors, field-specific search syntax, more flexible file import

[codebude]

• Enhanced search features
• Added support for multiple authors per book
• Clarify on author split modes in api and file import
• Mark author field as deprecated
• Joined validator for author and authors field to ensure at least one author is set
• Added different authors statistics card
• Fix docs fastdom dependency
• Export tags and authors as list instead of flattened string in user data export
• Fix inverted top/worst rated book ordering on statistics page
• Allow import transforms to return lists for adaptive authors/tags targets
• Use authors as the import target field with backward-compatible mapping
• Show authors field with adaptive string/array hint in import mapping editor
• Document authors import target and CSV export separators
• Fix data hygiene e2e seeding now that author is mandatory on create
• Make CSV delimiter a user-choice on import
• Option to set date_added on file imports
• Renamed availability to possession
• New all books tab on library page
• Add release notes to docs
• Add dashboard gamification (reading streaks & goals)
• Refresh reading streak after logging progress
• Add option to disable gamification on dashboard
• Documentation of reading streaks and goals functionality
• Make hero card on dashboard smaller (reduce height)
• Reorder gamification card on dashboard
• Shuffle next-to-read suggestions on dashboard
• Update release notes for v1.7.0

[github-actions]

🧪 Test Results — 2d3e464

✅ Backend (pytest) — 960 passed, 0 failed, 0 skipped (960 total)
✅ CLI (pytest) — 54 passed, 0 failed, 0 skipped (54 total)
✅ Frontend (vitest) — 420 passed, 0 failed, 0 skipped (420 total)
✅ E2E (Playwright) — 75 passed, 0 failed, 0 skipped (75 total)

Summary: ✅ All 1509 tests passed