{# Client-side pageview beacon — fires site-wide only when the visit was NOT tracked
server-side, i.e. no rpt_sid cookie (an edge-cached / cookie-free page). Records the
visit via the uncached /ev/ beacon endpoint (which sets rpt_sid), preserving
the real referrer + query for UTM/source attribution. Returning/server-tracked
visitors (rpt_sid present) skip it, so there is no double-count. #}