Theme does not update automatically on Linux

[exploids]

Describe the bug
When setting the theme to System, changes to the system theme are not reflected immediately. Only when setting the theme of Filen to Light/Dark and back to System, the theme updates to reflect the system theme.

To Reproduce
Steps to reproduce the behavior:

1. Set the system-wide theme to light
2. Set the theme of Filen to System
3. Change the system-wide theme to dark
4. Filen will still use the light theme

Expected behavior
I expect the theme of Filen to follow the system's theme and update immediately on changes.

Screenshots
https://github.com/user-attachments/assets/19881ece-9e47-46cf-aa02-cb1c7584964a

OS (please complete the following information):

• OS: Fedora Linux 41 (GNOME 47, Wayland)
• Hardware configuration: AMD Ryzen™ 7 5700U with Radeon™ Graphics × 16, 16.0 GiB RAM
• File system and Disk type used: SSD, ext4

Additional context