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When a thread is interrupted while subagents are running, the subagent
cards now show a red X icon instead of a green checkmark. This provides
clearer visual feedback that the subagent was canceled rather than
completed successfully.

The icon logic now handles three states:
- **Spinner**: when status is Pending or InProgress
- **Red X**: when status is Canceled, Failed, or Rejected  
- **Green checkmark**: when status is Completed

This matches the existing pattern used elsewhere in the codebase for
showing error states on tool calls.

(No release notes because subagents are still behind a feature flag.)

Release Notes:

- N/A