Check notification mute timer when app comes out of background

I had paused my notifications for one hour yesterday, then left my computer at some point. When I came back today, notifications were still paused with a negative timer: <img width="237" alt="Image" src="https://github.com/user-attachments/assets/5e144705-a92d-4a69-b246-eede2dcb4cad" /> We should either check the notification mute timer when the app comes out of background or regularly.