fix(prompt): wrap TextPrompt with str for clearer multiline display in debug view

[coolbeevip]

Description

Wrap TextPrompt with str() to improve readability of multiline prompts in debug view.

Fixes #3336

Checklist

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• I have updated the tests accordingly (required for a bug fix or a new feature)
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• I have added examples if this is a new feature

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✨ Finishing touches

🧪 Generate unit tests (beta)

• Create PR with unit tests
• Post copyable unit tests in a comment
• Commit unit tests in branch issue-3336

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[Wendong-Fan]

thanks @coolbeevip !