fix(macos): skip single-instance lock in Mac App Store builds (#1454)

fix(macos): skip single-instance lock in Mac App Store builds

electron/main.cjs

@@ -1227,7 +1227,9 @@ function stopBackendServer() {
   });
 }
 
-const gotTheLock = app.requestSingleInstanceLock();
+// App Sandbox denies the singleton socket bind, which reads as a held lock and
+// quits the app on every launch. macOS reactivates bundled apps anyway.
+const gotTheLock = process.mas || app.requestSingleInstanceLock();
 if (!gotTheLock) {
   console.log("Another instance is already running, quitting...");
   app.quit();