Replace custom tool-step & reasoning UI with shadcn/ui Marker component

[BoraIneviNMI]

Enhancements

• Now Gerrit's streamed events and tool calls are shown individually, using specific event icons, making use of the new shadcn Marker component.

Closes #669

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✨ Finishing Touches

🧪 Generate unit tests (beta)

• Create PR with unit tests
• Commit unit tests in branch FDM669

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[codecov]

Codecov Report

✅ All modified and coverable lines are covered by tests.

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