a11y(bio): give social links human-readable aria-labels

[Vidminas]

The resume-biography-3 social links set aria-label to the raw icon slug, so screen readers announced e.g. "brands/github" or "academicons/google-scholar" (WCAG 4.1.2). Prefer the link's label; otherwise fall back to the humanized icon basename (e.g. brands/github -> "Github"). Authors can set an explicit label for exact wording.

🚀 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 social links in the resume-biography-3 block set aria-label to the raw icon slug, so
screen readers announce link purposes as e.g. "brands/github", "academicons/google-scholar",
or "hero/link" (WCAG 4.1.2 — Name, Role, Value). Note the human-readable value already exists
in the template — it's just used for the title tooltip, not the accessible name.

Fix. Set aria-label to the link's label when present, otherwise the humanized icon
basename (brands/github → "Github", hero/link → "Link"). Authors can set an explicit label
for exact casing (e.g. "GitHub").

Verified on the academic-cv starter: the six bio social links now expose
E-mail Me / X / Github / Linkedin / Google scholar / Orcid — no raw brands/ or
hero/ slugs remain in any aria-label.

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📸 Screenshots or Screencast (if applicable)

n/a — accessible-name change; inspect the aria-label attributes or a screen reader.

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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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