Stack hero social CTAs as Scholar / LinkedIn+GitHub…

Details

On small phones the hero CTAs wrapped to leave GitHub orphaned on its own
row below a Google Scholar + LinkedIn pair. Insert a mobile-only flex break
after Google Scholar so it finishes the upper group and LinkedIn + GitHub
share the row below it. The break element is hidden (display:none) on
desktop, so the single-row layout there is unchanged.
Co-Authored-By: Claude Opus 4.8 <noreply@anthropic.com>
Claude-Session: https://claude.ai/code/session_01KJFqVKXbJpnQ2FyVX4RBBf

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