Light mode: active page in sidebar gets (essentially) hidden

Dark mode vs light mode:

<img width="354" height="262" alt="Image" src="https://github.com/user-attachments/assets/14f6b3ad-5687-4139-9d36-f30c8ace8399" />

<img width="354" height="262" alt="Image" src="https://github.com/user-attachments/assets/cce0c2e8-702c-4925-8725-4f0335738b62" />
