[collapsible] With CSS animations there is a flash on loaded when the panel is initially open

With animations, there is a flash when the page is loaded

https://github.com/user-attachments/assets/7a7cbde8-f34b-4158-8a3a-0ecce9c58648

Can we avoid that? I'd guess it happens because we are disabling transitions and animations when it mounts—could this be something we do in the initial render instead?

_Originally posted by @vladmoroz in https://github.com/mui/base-ui/issues/889#issuecomment-2508002780_
            

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[collapsible] With CSS animations there is a flash on loaded when the panel is initially open #904

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Uh oh!

[collapsible] With CSS animations there is a flash on loaded when the panel is initially open #904

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