feat(casting): improve track selection and session handling

implements automatic initialization of audio and subtitle tracks based on server-provided defaults. ensures subtitle selection persists correctly during stream reloads by resolving track indices more reliably.

replaces crypto-based uuid generation with a math-based fallback to ensure compatibility with environments lacking global crypto support. adds missing media source metadata to cast info to improve consistency between the client and receiver.

utils/casting/mediaInfo.ts

@@ -102,6 +102,8 @@ export const buildCastMediaInfo = ({
       Bitrate: src.Bitrate,
       Container: src.Container,
       Name: src.Name,
+      DefaultAudioStreamIndex: src.DefaultAudioStreamIndex,
+      DefaultSubtitleStreamIndex: src.DefaultSubtitleStreamIndex,
     })),
     UserData: item.UserData
       ? { PlaybackPositionTicks: item.UserData.PlaybackPositionTicks }