call `_processCropBorders()` once, from _initCurrentIndex and after new pages arrive.
Also make _processCropBorders idempotent by the existing _cropBorderCheckList guard
fix for the "jump back" bug that occurred when scrolling up in vertical continuous and webtoon reader modes.
- `ChapterPreloadManager` was maintaining its own `_currentIndex`.
- When prepending previous chapter pages, the index was being incremented
twice (once in the manager + once in `_handlePrevChapterPrepended`).
- This caused `itemScrollController.jumpTo()` to overshoot, resulting in
a visible jump forward (perceived as "jump back" while trying to scroll up).
- Removed all index management (`_currentIndex`, getter, setter, startIndex)
from `ChapterPreloadManager` and `ReaderMemoryManagement`.
- `ChapterPreloadManager` is now a pure data container (only manages `_pages`).
- `_handlePrevChapterPrepended` now captures the **current visible top index**
*before* prepending and adjusts the scroll position only once.
- `_readProgressListener` is now the single source of truth for `_currentIndex`.
- Removed stale `initialScrollIndex` logic from preload initialization.
- prevent stale settings overwrites by reloading settings inside Isar write txn before updating chapterPageUrlsList
- guard getPageLength() against missing chapter entries and empty urls to avoid No element crashes
- simplify read-threshold calculation in setPageIndex() via totalPages/pagesRemaining for continuous and paged modes
- map visible continuous double-page indices to actual page indices in _readProgressListener before persisting progress
- snapshot item positions and clamp indices during fast scrolling to avoid volatile first/last access races
- Added new localization strings for total, mean per title, completion rate, watching time, reading time, average chapters per title, read percentage, and entries in multiple languages.
- Enhanced the History model to include readingTimeSeconds.
- Updated AnimeStreamController and ReaderController to track reading time and save it to history.
- Implemented reading time tracking in Anime and Novel reader views.
- Introduced statistics calculations for total reading time across histories.
- Updated statistics screen to display total reading time and average reading time per title.
- Added UpcomingUIModel for managing upcoming manga list items with headers and items.
- Introduced CalendarDay widget to display individual days with event indicators.
- Created CalendarHeader widget for navigating between months.
- Developed CalendarIndicator for visualizing events on specific days.
- Implemented UpcomingCalendar to manage the calendar view and event loading.
- Added UpcomingItem widget for displaying individual upcoming manga with cover images.
- Introduced FetchInterval utility to calculate fetch intervals based on chapter upload dates.
- Refactored updateMangaDetail to utilize FetchInterval for smart update days.
- Enhanced MedianExtension to ensure correct median calculation.
- Removed unused imports and commented-out code for cleaner implementation.
- Implemented multiple navigation layouts for the reader, including L-shaped, Kindle, Edge, Right & Left, and Disabled modes.
- Added settings for keeping the screen on, showing page gaps, and adjusting webtoon side padding.
- Enhanced the reader settings modal to include new options and improved UI for navigation layout selection.
- Color filters: invert/gray/BCS
- to prevent old entries (before sourceId was introduced) from accidentally using conflicting sources with the same name even if they are not installed
- PageIndicator widget to display current page and total pages.
- Created ReaderAppBar for navigation and chapter information.
- ReaderBottomBar for page navigation and settings access.
- Added ReaderGestureHandler for managing tap zones and gestures.
- ReaderSettingsModal for user-configurable settings.
