`select-notifications` not scrollable on mobile

### Description

The background scrolls, the modal does not

https://github.com/user-attachments/assets/7590be2d-e641-41d1-a5b9-4f75f044b4a1

### How to replicate the issue + URL

Notification page

### Extension version

25.12.14

### Browser(s) used

Safari mobile 26.2

### Token &#9888;&#65039;

- [x] I set a token in the options page. I understand that some features require a token to work.