Animate the Sidebar Objects Tree view opening/closing

[Bonapara]

Current Behavior

The tree view opens without animation, confusing. (There is a sudden change of states that is hard to grasp.)

Desired Behavior

We want to introduce an animation when opening the menu so the user doesn't feel lost.

The animation should be 300ms and look like this:

https://github.com/user-attachments/assets/a16fae23-4cb5-47c7-80fa-ed9edf3118a2