Replace the flat, repetitive 'Agent used X' activity list with a
structured narrative timeline:
- Group consecutive same-tool calls into collapsible rows with context
(e.g. 'Viewed 4 files' with file names listed below)
- Use verb-based labels with arguments: 'Viewed ChatPane.tsx:148-250',
'Searched for tool-call', 'Edited runTimeline.ts'
- Promote report_intent events to phase dividers that segment the
timeline into labeled stages of work
- Show latest intent text in the collapsed header summary
- Use category-specific icons (Eye, Search, Pencil, Terminal, etc.)
instead of the universal wrench
- Render thinking steps as quoted blocks with 'N more' toggle for
consecutive groups
All data was already available in RunTimelineEventRecord.toolArguments;
this change surfaces it prominently instead of hiding it behind
expandable detail panels.
Co-authored-by: Copilot <223556219+Copilot@users.noreply.github.com>
