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/resolve/integrations.ts

@@ -364,9 +364,6 @@ export function applyIntegrationConfig(context: ResolveContext): void {
     const stringKeys = [
       'serverUrl',
       'username',
-      'deviceId',
-      'clientName',
-      'clientVersion',
       'defaultLibraryId',
       'iconCacheDir',
       'transcodeVideoCodec',