- Remove assistant message headers; show provider icon, model, agent,
thinking variant, duration and time in the turn footer (metadata left,
hover-revealed actions right)
- Merge turns started by hidden user messages (subagent nudges) into the
previous turn so Activity, footer and spacing stay continuous
- Treat compaction summary text (info.summary) as justification activity
in sorted mode and skip it when picking the turn summary
- Interleave activity segments with standalone tool rows so Agent Task
sits chronologically between activity sections