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e01d228a - [playground] Provide fallback monospace-font (#17242)

[playground] Provide fallback monospace-font (#17242) <img width="1679" alt="Screenshot 2025-04-06 at 22 51 43" src="https://github.com/user-attachments/assets/ccd9dd1a-67cd-4bc3-a22a-f3c530b8670d" />