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/casting/CastingMiniPlayer.tsx

@@ -127,8 +127,9 @@ export const CastingMiniPlayer: React.FC = () => {
       currentItem.ParentIndexNumber !== undefined &&
       currentItem.SeasonId
     ) {
-      // Build season poster URL using SeriesId and SeasonId as tag
-      return `${api.basePath}/Items/${currentItem.SeriesId}/Images/Primary?fillHeight=120&fillWidth=80&quality=96&tag=${currentItem.SeasonId}`;
+      // Build season poster URL using SeriesId and image tag for cache validation
+      const imageTag = currentItem.ImageTags?.Primary || "";
+      return `${api.basePath}/Items/${currentItem.SeriesId}/Images/Primary?fillHeight=120&fillWidth=80&quality=96${imageTag ? `&tag=${imageTag}` : ""}`;
     }
 
     // For non-episodes, use item's own poster