Location fixes:
- Add coordinate validation to reject invalid (0,0) and out-of-bounds locations
- Clean up stale participants after 15 minutes (was 1 hour)
- Remove invalid locations from localStorage on load
- Use CCH venue center instead of (0,0) for indoor positions without GPS
Session persistence:
- Remember user name and emoji across sessions on home page
- Pre-fill profile form with saved user info
Mobile UI improvements:
- Add floating location share button inside the map
- Visible on all screen sizes with responsive text
- Prominent styling: white when inactive, green when sharing
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Co-Authored-By: Claude Opus 4.5 <noreply@anthropic.com>