Phase 1 Week 2: Format detection and progress conversion engine

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- Add internal/sync package with format detection
- FormatGroup types: reflowable, fixed_layout, comic_archive
- DetectFormatGroup() function based on mimetype and file extension
- MimeType mappings for common ebook formats
- Progress conversion engine with:
  - ConvertProgress() between format groups
  - Extract percentage from various progress formats
  - PageToPercentage / PercentageToPage helpers
  - CharacterToPercentage / PercentageToCharacter helpers
  - MergeProgress() with 'max progress wins' strategy
  - FormatProgressForDisplay() for UI rendering
- Add sqlc queries for format detection and progress updates
- BulkUpdateFormatGroups query for auto-format detection
- GetUniversalProgress query with all location references
- UpdateUniversalProgress query with device sync metadata
- ReadingHistory queries for session tracking

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john-okeefe

2026-01-30 16:07:00 -05:00

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commit bb3c32c59f

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UNIVERSAL_SYNC_IMPLEMENTATION_GUIDE.md

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