fix(jellyfin): fix discovery loop, device identity, tray state, and Disc

- Derive device identity from OS hostname; remove legacy configurable client/device fields
- Prevent discovery playback from reloading active item, misreporting pause state, and duplicate overlay restores
- Restart stale tray discovery sessions without re-login when server drops SubMiner cast target
- Sync tray discovery checkbox state on Linux after CLI/startup/remote-session changes
- Stop Discord presence falling back to stream URLs; prime title before tokenized stream loads
- Fix picker library discovery when log level is above info
- Fix config.example.jsonc trailing commas and array formatting

src/main/runtime/composers/jellyfin-remote-composer.ts

@@ -101,6 +101,7 @@ export function composeJellyfinRemoteHandlers(
       getConfiguredSession: options.getConfiguredSession,
       getClientInfo: options.getClientInfo,
       getJellyfinConfig: options.getJellyfinConfig,
+      getActivePlayback: options.getActivePlayback,
       playJellyfinItem: options.playJellyfinItem,
       logWarn: options.logWarn,
     });