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/definitions/defaults-integrations.ts

@@ -130,14 +130,10 @@ export const INTEGRATIONS_DEFAULT_CONFIG: Pick<
     serverUrl: '',
     recentServers: [],
     username: '',
-    deviceId: 'subminer',
-    clientName: 'SubMiner',
-    clientVersion: '0.1.0',
     defaultLibraryId: '',
     remoteControlEnabled: true,
     remoteControlAutoConnect: true,
     autoAnnounce: false,
-    remoteControlDeviceName: 'SubMiner',
     pullPictures: false,
     iconCacheDir: '/tmp/subminer-jellyfin-icons',
     directPlayPreferred: true,

src/config/definitions/options-integrations.ts

@@ -548,26 +548,6 @@ export function buildIntegrationConfigOptionRegistry(
       defaultValue: defaultConfig.jellyfin.username,
       description: 'Default Jellyfin username used during CLI login.',
     },
-    {
-      path: 'jellyfin.deviceId',
-      kind: 'string',
-      defaultValue: defaultConfig.jellyfin.deviceId,
-      description:
-        'Stable device identifier sent on the Jellyfin authentication handshake; primarily internal.',
-    },
-    {
-      path: 'jellyfin.clientName',
-      kind: 'string',
-      defaultValue: defaultConfig.jellyfin.clientName,
-      description: 'Client name sent on the Jellyfin authentication handshake; primarily internal.',
-    },
-    {
-      path: 'jellyfin.clientVersion',
-      kind: 'string',
-      defaultValue: defaultConfig.jellyfin.clientVersion,
-      description:
-        'Client version sent on the Jellyfin authentication handshake; primarily internal.',
-    },
     {
       path: 'jellyfin.defaultLibraryId',
       kind: 'string',
@@ -593,12 +573,6 @@ export function buildIntegrationConfigOptionRegistry(
       description:
         'When enabled, automatically trigger remote announce/visibility check on websocket connect.',
     },
-    {
-      path: 'jellyfin.remoteControlDeviceName',
-      kind: 'string',
-      defaultValue: defaultConfig.jellyfin.remoteControlDeviceName,
-      description: 'Device name reported for Jellyfin remote control sessions.',
-    },
     {
       path: 'jellyfin.pullPictures',
       kind: 'boolean',