On mobile: move action buttons below the banner into their own row
(flex-1 Follow + Download, compact Re-index) instead of cramming
three full-size buttons inside the banner overlay alongside the avatar
and name. Desktop keeps the original inline layout. Also reduced
banner height, avatar size, and description to 2-line clamp on mobile.
Co-Authored-By: Claude Sonnet 4.6 <noreply@anthropic.com>
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