Dolphin doesn't change the color instantly if it's open

### Compositor

Niri

### If Other, please specify

_No response_

### Distribution

Arch Linux

### If Other, please specify

_No response_

### Select your Installation Method

DankInstaller

### Was your original Installation method different?

Yes

### If no, specify

_No response_

### dms doctor -vC

_No response_

### Description

Dolphin doesn't change the color instantly if it's open. When my wallpaper changes as well as the colors, I have to close it and reopen it to see the effect. But on the other hand, Nautilus file manager changes the color instantly. Is this how it supposed to be with Dolphin?

### Solutions Tried

I followed all method mentioned in the documentation including qt6ct-kde package method.

### Configuration Details

_No response_

### Screenshots/Recordings

_No response_

Start by reproducing the issue on Arch Linux with Dolphin already open, changing the wallpaper and shell colors through DankMaterialShell. Review the documented qt6ct-kde installation method and compare the behavior with Nautilus. Done means Dolphin reflects the new colors without being closed and reopened.

Written by the indexing model from the issue text.