Session Timeline Row
Session row with vertical timeline rails flanking the play button. Used on the user detail page where each session expands into its child events. Compound: Root, Row, Rail, PlayButton, Meta, Events.
Default
Rails, play button, sequence + time + event count, and duration. No expanded events.
With events
Same row with SessionEventRow children inside Events. Vertical rails connect the play button to each event dot; error events carry a trailing problem button.
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Date-grouped sessions
Full grouped scene matching the user-detail sessions tab: a collapsible SessionDateGroup wrapping multiple SessionTimelineRows, each expanding into SessionEventRow children.