docs: Remove implemented reader refactoring design document
Remove READER_REFACTOR_MODULARIZATION_AND_PAGINATION.md as the modularization and pagination refactoring has been completed and integrated into the codebase. This document outlined: - Modular reader architecture by format (reflowable, pdf, comic, manga) - Page-based pagination using word count estimation - CFI-based progress tracking for reflowable formats - Format-agnostic UI components The implementation has been completed, so this design document is no longer needed.
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