Add shared social links footer partial

[minimaluminium]

Summary

• add shared footer social link markup and styles
• switch shared author Twitter icon usage to X
• bump shared theme assets package version to 2.7.1

Testing

• git diff --cached --check
• node -e Handlebars parse for changed shared partials

Note: this intentionally excludes theme built assets and locale output; those belong in the follow-up theme consumer PR.

[coderabbitai]

Caution

Review failed

The pull request is closed.

ℹ️ Recent review info

⚙️ Run configuration

Configuration used: Organization UI

Review profile: CHILL

Plan: Pro

Run ID: 956546a5-221c-4845-b2a9-660c4f47aea7

📥 Commits

Reviewing files that changed from the base of the PR and between 8ffe3c5 and 94f763e.

📒 Files selected for processing (4)

• packages/_shared/assets/css/v1/components/footer.css
• packages/_shared/assets/css/v2/components/footer.css
• packages/_shared/partials/author-header.hbs
• packages/_shared/partials/footer.hbs

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Walkthrough

This PR introduces a footer redesign with social links. CSS changes across v1 and v2 stylesheets add a centered footer section (.gh-foot-center) and social links container (.gh-social-links) with flexbox layout, spacing, and fixed SVG icon sizing. The footer template now renders social account links using platform-specific icon partials with fallback text, organized within the new centered wrapper. The Twitter icon is replaced with the X icon in the author header to reflect branding updates.

Estimated code review effort

🎯 2 (Simple) | ⏱️ ~12 minutes

✨ Finishing Touches

🧪 Generate unit tests (beta)

• Create PR with unit tests
• Commit unit tests in branch codex/shared-social-links

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