BUG: Not compatible with Accent Colour: Automatic, On Windows 11

### Checks

- [x] I have checked that this issue has not already been reported.

- [x] I am using the latest version of Flow Launcher.

- [ ] I am using the prerelease version of Flow Launcher.

### Problem Description

My Windows 11 Accent colour is Automatic based on the wallpaper, I have my wallpaper on a slideshow mode changing every 1 minute so there's always a new accent colour.

But the second I turn accent colour on automatic flow launcher can't handle it and consistently crashes, lagging my entire computer before it crashes. I can also turn accent colour off automatic and it instantly begins working again

I have WIN UI 3 theme installed and enabled if that helps

[Flow.Launcher.2026-08-25.log](https://github.com/user-attachments/files/31416707/Flow.Launcher.2026-08-25.log)

### To Reproduce

1. Be on Windows 11
2. Enable Accent Colour automatic & slideshow changing every 1 minute
3. Type anything in flow launcher
4. Crash

### Screenshots

_No response_

### Flow Launcher Version

2.1.3

### Windows Build Number

Version 10.0.26200.9168

### Error Log

[Flow.Launcher.2026-08-25.log](https://github.com/user-attachments/files/31416806/Flow.Launcher.2026-08-25.log)

Start by reproducing the crash with Windows 11 Accent colour set to Automatic and a wallpaper slideshow, then review the attached Flow.Launcher log for the failing component. Trace the accent-colour or theme-handling entry point and verify that typing in Flow Launcher remains responsive and does not crash while the accent colour changes.

Written by the indexing model from the issue text.