feat(ui): add ToolResultCard component for displaying tool results

[AjayKumbham]

Summary

Adds a reusable ToolResultCard component for displaying tool results (such as event details) in a rich card UI, inspired by the Gmail search results component.

Details

• Accepts title, subtitle, details, attendees, and externalLink as props.
• Expand/collapse for details.
• Fully documented, accessible, and styled to match the app.

Closes

Closes #8

CLA

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[AjayKumbham]

I have read the CLA Document and I hereby sign the CLA