- Render deduped active tool cards with the execution args carried by ActiveTool.
- Covered differing raw assistant args and effective active args in the transcript regression test.
Fixes#4948
- Dedup active tools against committed assistant tool calls as well as the stream ghost.
- Hide the working shimmer while active tools are rendering, preserving it for between-tool model work.
- Added focused Transcript regression coverage for duplicate cards and stale shimmer.
Fixes#4948
roboomp