Tools were only visible after tool_execution_end because the UI relied
solely on toolResult messages (created at tool_execution_start, ~8ms
before end). Now MessageList detects toolCall blocks in the streaming
assistant message and renders them as "running" ToolCallItems immediately.
Once a real toolResult message arrives, the synthetic one is replaced.
- Add resolvedToolCallIds set to deduplicate assistant vs toolResult renders
- Extract getTextContent to shared utils to avoid duplication
- Wrap MessageList and ToolCallItem in memo for performance
- Add accessible region/tabIndex to expanded result panel
Co-Authored-By: Claude Opus 4.5 <noreply@anthropic.com>
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