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/config/settings/registry.ts

@@ -68,12 +68,8 @@ export const LEGACY_HIDDEN_CONFIG_PATHS = [
   'anilist.characterDictionary.profileScope',
   'jellyfin.accessToken',
   'jellyfin.userId',
-  'jellyfin.clientName',
-  'jellyfin.clientVersion',
   'jellyfin.defaultLibraryId',
-  'jellyfin.deviceId',
   'jellyfin.directPlayContainers',
-  'jellyfin.remoteControlDeviceName',
   'controller.buttonIndices',
   'shortcuts.multiCopyTimeoutMs',
   'subtitleSidebar.toggleKey',