Bring 323 commits of develop (incl. the Expo SDK 56 / TV-branch work) into
the chromecast refactor. Conflict resolutions:
- chapters: take develop's reviewed version (ChapterList/ChapterTicks/
chapters.ts/test) — adds chapterNameAt, markers API, themed Colors.
- auto-skip: keep chromecast's unified useSegmentSkipper for the phone
player; restore develop's useCreditSkipper/useIntroSkipper (deleted on
chromecast) so develop's Controls.tv.tsx compiles. TV->useSegmentSkipper
migration left as follow-up.
- en.json: union the two player blocks (kept chromecast casting keys +
develop's subtitle/playback keys).
- TechnicalInfoOverlay/PlatformDropdown: take develop's TV-safe versions
(kept chromecast's disabled-prop branch, aliased to avoid shadowing the
@expo/ui disabled modifier).
- SDK 56 fixes: expo-router Router -> ImperativeRouter in cast components;
ChapterTicks markers API in CastPlayerProgressBar.
- restore utils/profiles/chromecast* (deleted on chromecast, still used by
PlayButton).
Typecheck passes; bun.lock regenerated against merged package.json.
