[feat] Ability to open directories rather than just unfold from the tree

[Robio]

Describe the problem

I'd like to be able to double-click a directory, and have it open in the sidebar, replacing the tree view. Then be able to use ◀︎ or a keyboard shortcut to navigate back.

Describe the solution you'd like

Opening directories on their own, as described above.

Alternatives considered

No response

Additional context

No response