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

launcher/main.test.ts

@@ -17,6 +17,7 @@ import {
   parseEpisodePathFromDisplay,
   buildRootSearchGroups,
   classifyJellyfinChildSelection,
+  buildForwardedJellyfinAppArgs,
 } from './jellyfin.js';
 
 type RunResult = {
@@ -878,6 +879,27 @@ test('parseJellyfinItemsFromAppOutput parses item title/id/type tuples', () => {
   ]);
 });
 
+test('buildForwardedJellyfinAppArgs forces app log level for parseable list output', () => {
+  const forwarded = buildForwardedJellyfinAppArgs(
+    {
+      jellyfinServer: 'https://jf.example.test/',
+      passwordStore: 'gnome-libsecret',
+      logLevel: 'info',
+    } as never,
+    ['--jellyfin-libraries'],
+  );
+
+  assert.deepEqual(forwarded, [
+    '--jellyfin-libraries',
+    '--jellyfin-server',
+    'https://jf.example.test',
+    '--password-store',
+    'gnome-libsecret',
+    '--log-level',
+    'info',
+  ]);
+});
+
 test('parseJellyfinErrorFromAppOutput extracts bracketed error lines', () => {
   const parsed = parseJellyfinErrorFromAppOutput(`
 [subminer] - 2026-03-01 13:10:34 - WARN - [main] test warning