Logo links should have visible tab focus: Linked logo section

## Component/pattern to amend

[Linked logo section](https://vanillaframework.io/docs/patterns/linked-logo-section)

## Context

When you navigate through the links using keyboard, there is no visible indication as to what link you are currently on. It should show a blue square around the link or entire item, as it does with regular links.

## Browser/device

- Ubuntu 24.04.3
- Chrome Version 140.0.7339.127

Start with the Linked logo section pattern linked in the issue and reproduce keyboard navigation in Chrome on Ubuntu. Inspect the pattern's focus styling and compare it with regular links. Done means keyboard-focused logo links have a visible blue square around the link or entire item.

Written by the indexing model from the issue text.