Fetch live Bluesky profile for avatar and linked username on profile page
Calls the Bluesky API at render time (in parallel with ClickHouse) to show
the user's current avatar and display name, with graceful fallback to DB
values. Profile header links to bsky.app as a hover group.
Co-Authored-By: Claude Opus 4.6 (1M context) <noreply@anthropic.com>