style: update sidebar animation from ease-linear to ease-in-out

[sergioxro]

with the new artifacts animations, the linear animation feels out of place

before:

https://github.com/user-attachments/assets/75cf1ac3-ffc8-4c5b-ba97-a682c7b36ae9

after:

https://github.com/user-attachments/assets/95b21a3f-d541-4eef-a622-c1d6a9864643

[vercel[bot]]

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