- Create readingProgressUtils.ts with filterByReadingProgress function
- Create readingDataProcessor.ts with shared processing functions:
- processReadingPositions
- processMarkedAsRead
- filterValidItems
- sortByReadingActivity
- Refactor readsService.ts to use shared utilities
- Refactor linksService.ts to use shared utilities
- Eliminate 100+ lines of duplicated code
- Simplify Me.tsx filter logic to 2 lines
Benefits:
- Single source of truth for reading progress filtering
- Easier to maintain and modify
- Less code duplication across services
- More testable with isolated utility functions
