a11y(attachments): restore keyboard focus with :focus-visible

[Vidminas]

The .hb-attachment-link action buttons (publication/project links) hard-removed their focus outline (outline-none + focus:outline-none) with no :focus-visible replacement anywhere in the framework CSS, so keyboard users got no visible focus indicator (WCAG 2.4.7).

🚀 What type of change is this?

• 🐛 Bug fix (A non-breaking change that fixes an issue)
• ✨ New feature (A non-breaking change that adds functionality)
• 💅 Style change (A change that only affects formatting, visuals, or styling)
• 📚 Documentation update (Changes to documentation only)
• 🧹 Refactor or chore (A code change that neither fixes a bug nor adds a feature)
• 💥 Breaking change (A fix or feature that would cause existing functionality to not work as expected)

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🎯 What is the purpose of this change?

The .hb-attachment-link action buttons (the PDF / Cite / Code / Source links on publication rows,
project cards, and detail pages) hard-remove their focus outline —
@apply … outline-none … focus:outline-none — and there is no :focus-visible rule anywhere in
assets/css/framework/ to restore one. So these controls have no visible keyboard focus
indicator (WCAG 2.4.7).

Fix. Drop the blanket suppression from the @apply and add an explicit :focus-visible ring
(with a dark-mode colour). :focus-visible shows the ring for keyboard focus but not on mouse
click, so it fixes the a11y gap without introducing a click outline.

Verified on the academic-cv starter (406 attachment links): the compiled CSS now contains
.hb-attachment-link:focus-visible { outline: 2px solid var(--color-primary-600); … } (plus the
.dark variant), and the base rule no longer forces the outline off.

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📸 Screenshots or Screencast (if applicable)

Keyboard focus on a publication's first action link (the PDF button):

Before — main (outline suppressed)	After — this PR (:focus-visible ring)

Before, the focused button has no visible indicator; after, it gets a :focus-visible outline.
Mouse-clicking the same button shows no ring (that's the point of :focus-visible).

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ℹ️ Documentation Check

• No, this change does not require a documentation update.
• Yes, I have updated the documentation accordingly (or will in a follow-up PR).

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