The workspace icon blink is too "flashy" when chnging monitor

### Feature Description

You can see here how the workspace widget reacts to changing focus between two monitors. The icon is either "normal" or faded. The change between these states is too attention-grabbing in my opinion.

https://github.com/user-attachments/assets/ff974aba-c3cb-4844-8143-fcdc24412902

### Use Case

Less distracions

### Compositor(s)

Niri

### If Other, please specify

_No response_

### Proposed Solution

It should be much more smooth or delicate. Right now it is a bit distracting.

### Alternatives/Existing Solutions

_No response_

The issue concerns the workspace widget's normal/faded icon transition when focus changes between monitors under Niri, but it names no file or test. Start by locating the workspace widget and its focus-change transition, then verify across two monitors that the animation is smoother and less attention-grabbing.

Written by the indexing model from the issue text.