There's only one welcome-step button (#welcome-continue, label "Start
the introduction"); the recent renames were sequential edits to the
same button, not two separate CTAs. The click immediately navigates to
/timeline so the subsequent timeline_view event already captures it.
Also clarified GET / no longer has a timeline branch, and pinned down
how session_id flows into the login event (refactor issueSession to
return its new ID).
Co-Authored-By: Claude Opus 4.7 (1M context) <noreply@anthropic.com>