Fix subtitle-cycle OSD labels and harden quality gates

- Resolve J/Shift+J subtitle-cycle OSD text via track-list labels and property expansion
- Add mpv proxy OSD runtime + regression coverage across IPC/main/runtime paths
- Scope `make pretty` to maintained source files and add scoped Prettier script
- Align release workflow with cache/install order and explicit TypeScript check
- Clean up duplicate submodule entry and remove checked-in docs/plans artifacts

src/core/services/app-ready.test.ts

@@ -99,8 +99,7 @@ test('runAppReadyRuntime starts texthooker on startup when enabled in config', a
     calls.indexOf('createMpvClient') < calls.indexOf('startTexthooker:5174:ws://127.0.0.1:6678'),
   );
   assert.ok(
-    calls.indexOf('startTexthooker:5174:ws://127.0.0.1:6678') <
-      calls.indexOf('handleInitialArgs'),
+    calls.indexOf('startTexthooker:5174:ws://127.0.0.1:6678') < calls.indexOf('handleInitialArgs'),
   );
 });