feat: option to show chapters inline in details screen

[sang765]

What

Adds a new setting under Details screen appearance — "Chapters in details screen" — that replaces the chapters bottom sheet with an inline chapter list rendered directly below Related manga in the manga details screen.

Why

The bottom-sheet chapter list is convenient but hides the chapters behind a pull-up gesture. With the new option the chapter list is always visible when scrolling the details page, matching the "everything on one screen" pattern used by other readers.

How

• Setting: details_chapters_inline (Boolean, default false) in pref_details_appearance.xml, exposed via AppSettings.isChaptersInlineEnabled.
• Layouts (phone only): new "Chapters" section after group_related in activity_details.xml (with a read MaterialSplitButton reusing ReadButtonDelegate) and activity_details_classic.xml (no split button — classic already has its own read button). Both wrap the section in group_chapters_inline (GONE by default) and host the existing ChaptersFragment in container_chapters_inline.
• Activities: when the option is on, DetailsActivity / DetailsClassicActivity hide container_bottom_sheet + navbarDim, show the inline group, add ChaptersFragment programmatically (so the fragment is never created when the option is off), attach ReadButtonDelegate (modern), and return null from BottomSheetOwner.bottomSheet so snackbars anchor to the scroll view. Peek-height bottom padding and navbar-dim insets handling are skipped while inline.
• Tablets (w600dp-land) are intentionally unchanged — they already render chapters in the side card and have no bottom sheet, so the setting is a no-op there.

Limitations

• Phone layouts only (see above).
• While inline, the Pages/Bookmarks tabs and the sheet toolbar toggles (reverse order, grid, downloaded-only) are not reachable from the details screen.

Test

• ./gradlew :app:compileDebugKotlin passes.