fix(explore): merge caps and skills in stats recent activity and pulse
The auto-resolved merge kept HEAD's caps-only renderStats and pulse
indicator. Restore the feature branch's improvements: recent activity
merges both caps and skills sorted by time, and the pulse indicator
checks both sources for the most recent network activity.
Co-Authored-By: Claude Opus 4.6 (1M context) <noreply@anthropic.com>