Improper Sizing with Multiple Monitors

**Description**
The wallpaper does not size properly across multiple monitors.

<img width="4474" height="1433" alt="Image" src="https://github.com/user-attachments/assets/ef5fa73c-5962-4123-90f5-e5fd8a2c23e3" />

**OS and Shell Information**
 - OS: Arch
 - GNOME Shell: 48
 - Session type: X11
