Codeberg: Text On Merged Button Hard to Read

### Is there an existing issue outlining your problem?

- [x] I have searched the existing issues and they do not solve my problem.

### What userstyle are you seeing the problem on?

lbl:codeberg

### Describe your problem.

The text on the merged button is too light which makes it hard to read.

### Attach screenshots.

[merged.png](https://github.com/user-attachments/assets/e20a42cb-2a71-44d6-a8f7-deb9d936cc75)

### Browser version(s) this issue occurs on

Zen v1.19.8b

### Stylus extension version

Stylus 2.3.19

### Installed version of the userstyle

v2026.04.16

### Any additional comments?

Themed by this:
```css
.ui.ui.ui.purple.label {
background: var(--color-purple);
border-color: var(--color-purple);
color: var(--color-white);
}
```

Open the `lbl:codeberg` userstyle and use the reported `.ui.ui.ui.purple.label` rule as the entry point; compare it with the attached merged-button screenshot. Adjust the merged-button text contrast and verify the result in Codeberg using the stated Zen and Stylus versions.

Written by the indexing model from the issue text.