Merge origin/develop into refactor-chromecast

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.

components/casting/player/CastPlayerEpisodeControls.tsx

@@ -7,7 +7,7 @@
 
 import { Ionicons } from "@expo/vector-icons";
 import type { BaseItemDto } from "@jellyfin/sdk/lib/generated-client";
-import type { Router } from "expo-router";
+import type { ImperativeRouter } from "expo-router";
 import { useTranslation } from "react-i18next";
 import { Pressable, View } from "react-native";
 import type { RemoteMediaClient } from "react-native-google-cast";
@@ -33,7 +33,7 @@ interface CastPlayerEpisodeControlsProps {
   /** Load a different episode on the Chromecast. */
   loadEpisode: (episode: BaseItemDto) => Promise<void>;
   /** Expo Router instance for navigation on stop. */
-  router: Router;
+  router: ImperativeRouter;
 }
 
 export function CastPlayerEpisodeControls({