refactor: make subsync manual-only, default opt-in features off, preserv

- Remove subsync.defaultMode; subsync always opens manual picker
- Default jellyfinRemoteSession warmup and nameMatchEnabled to false
- Stop rewriting config file during legacy migration (resolve in-memory only)
- Fix macOS quit on window-close for --setup launch mode

src/config/resolve/subtitle-style.test.ts

@@ -162,7 +162,7 @@ test('subtitleStyle nameMatchEnabled falls back on invalid value', () => {
 
   applySubtitleDomainConfig(context);
 
-  assert.equal(context.resolved.subtitleStyle.nameMatchEnabled, true);
+  assert.equal(context.resolved.subtitleStyle.nameMatchEnabled, false);
   assert.ok(
     warnings.some(
       (warning) =>