Fix: Improves Chromecast casting experience

Fixes several issues and enhances the Chromecast casting experience:

- Prevents errors when loading media by slimming down the customData payload to avoid exceeding message size limits.
- Improves logic for selecting custom data from media status.
- Fixes an issue with subtitle track selection.
- Recommends stereo audio tracks for better Chromecast compatibility.
- Improves volume control and mute synchronization between the app and the Chromecast device.
- Adds error handling for `loadMedia` in `PlayButton`.
- Fixes image caching issue for season posters in mini player.
- Implements cleanup for scroll retry timeout in episode list.
- Ensures segment skipping functions are asynchronous.
- Resets `hasReportedStartRef` after stopping casting.
- Prevents seeking past the end of Outro segments.
- Reports playback progress more accurately by also taking player state changes into account.

components/PlayButton.tsx

@@ -210,6 +210,9 @@ export const PlayButton: React.FC<Props> = ({
                         return;
                       }
                       router.push("/casting-player");
+                    })
+                    .catch((err) => {
+                      console.error("[PlayButton] loadMedia failed:", err);
                     });
                 } catch (e) {
                   console.error("[PlayButton] Cast error:", e);