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[playground] ViewTransition on tab switch (#34596)

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## Summary

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Explain the **motivation** for making this change. What existing problem
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Utilized `<ViewTransition>` to introduce a sliding animation upon
switching between the Output and SourceMap tabs in the default
playground view.

## How did you test this change?

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https://github.com/user-attachments/assets/1ac93482-8104-4f9a-887e-6adca3537dca
E
Eugene Choi committed
3580584ba2bdce17572aa356da1d6a09a2d2e3b3
Parent: 319a786
Committed by GitHub <noreply@github.com> on 9/29/2025, 6:40:33 PM