Reorders sections in the streaming call preview to match `renderResult` and the
schema's field order. This prevents visual jumps when the preview transitions
to a result and ensures append-only growth of streamed content.
Additionally, omits the agent-list divider when no agent rows are present.
- Added smooth streaming reveal of streamed tool-call args and `{ input }` partial previews.
- Integrated ToolArgsRevealController in EventController to route partial and final args.
- Implemented UTF-16-safe slicing to prevent surrogate-pair splits during reveal boundaries.
- Implemented reveal lifecycle controls to flush or stop streamed arg frames at message boundaries.
- Added tests for monotonic reveal progression, non-smooth immediate output, and flush/stop behavior.
can1357