[38129] Open the next notification only when the split screen is already open (#9848)

* Open the next notification only when the split screen is already open

* Use StateService to check whether details is open

Co-authored-by: Oliver Günther <mail@oliverguenther.de>

frontend/src/app/features/in-app-notifications/center/state/ian-center.service.ts

@@ -216,7 +216,7 @@ export class IanCenterService extends UntilDestroyedMixin {
       },
     });
 
-    if (!this.deviceService.isMobile) {
+    if (!this.deviceService.isMobile && this.state.includes('**.details.*')) {
       this.showNextNotification();
     }
   }