When using other materials other than Mica, the border looks off

**Description**
When using other materials other than Mica, the top border of the navbar ruins the consistent transparency

**Screenshots**
<img width="403" height="81" alt="Image" src="https://github.com/user-attachments/assets/3ba51a50-7a73-4049-9c95-b44b560809b6" />

**Tweaks in use**
Defaults

**Additional context**
Acrylic material used via a Windhawk mod