fix(launcher): run jellyfin discovery as background tray session

docs/configuration.md

@@ -884,7 +884,7 @@ Launcher subcommands:
 - `subminer jellyfin -l --server ... --username ... --password ...` logs in.
 - `subminer jellyfin --logout` clears stored credentials.
 - `subminer jellyfin -p` opens play picker.
-- `subminer jellyfin -d` starts cast discovery mode.
+- `subminer jellyfin -d` starts cast discovery mode in background/tray mode.
 - These launcher commands also accept `--password-store=<backend>` to override the launcher-app forwarded Electron switch.
 
 See [Jellyfin Integration](/jellyfin-integration) for the full setup and cast-to-device guide.

docs/usage.md

@@ -55,7 +55,8 @@ subminer jellyfin                 # Open Jellyfin setup window (subcommand form)
 subminer jellyfin -l --server http://127.0.0.1:8096 --username me --password 'secret'
 subminer jellyfin --logout        # Clear stored Jellyfin token/session data
 subminer jellyfin -p              # Interactive Jellyfin library/item picker + playback
-subminer jellyfin -d              # Jellyfin cast-discovery mode (foreground app)
+subminer jellyfin -d              # Jellyfin cast-discovery mode (background tray app)
+subminer app --stop               # Stop background app (including Jellyfin cast broadcast)
 subminer doctor                   # Dependency + config + socket diagnostics
 subminer config path              # Print active config path
 subminer config show              # Print active config contents

launcher/commands/jellyfin-command.ts

@@ -65,7 +65,7 @@ export async function runJellyfinCommand(context: LauncherCommandContext): Promi
   }
 
   if (args.jellyfinDiscovery) {
-    const forwarded = ['--start'];
+    const forwarded = ['--background', '--jellyfin-remote-announce'];
     if (args.logLevel !== 'info') forwarded.push('--log-level', args.logLevel);
     appendPasswordStore(forwarded);
     runAppCommandWithInherit(appPath, forwarded);