link hover card title is default black

.. hence unreadable in dark mode with dark background:

<img width="600" height="539" alt="Image" src="https://github.com/user-attachments/assets/c643029e-7f0f-47e8-9915-f28096088f4d" />

as opposed to

<img width="613" height="545" alt="Image" src="https://github.com/user-attachments/assets/74231c40-8522-4ab1-8f69-2dce56a4a871" />