Update reader-shell.ts to import from the new modular structure, preparing
for the integration of page-based pagination system for reflowable formats.
## Import Updates
### Format Modules
- parseReflowable: Unified parser for EPUB, FB2, TXT, HTML
- calculatePagination: Word-count based page calculation
- shouldRecalculate: Viewport change detection for recalculation
- restorePosition: CFI-based position restoration
- applyPaginatedStyles: CSS styling for paginated content
### Type System
- ReflowableBook: New type for page-based book data
- PaginationSettings: Configuration for page calculation
### UI Components
- updatePageDisplay: Page X of Y display
- updateProgressBar: Progress bar updates
## Purpose
These imports prepare reader-shell.ts for the upcoming implementation of:
1. Page-based pagination for reflowable formats
2. CFI-based progress tracking and restoration
3. Dynamic recalculation on viewport/font changes
4. Integration with new modular architecture
The actual implementation using these imports will follow in subsequent commits
to replace the broken spine-based system with working page-based pagination.