Store DropdownContent states in local storage

I watched @mblanco suffer with some tedious manual metadata checking. She opens many elements in tabs, then on each tab, zooms in on a part of the image and has to scroll down to read a single metadata and check that they match. The fact that the dropdowns of the DetailsPanel do not keep their open or closed state when switching tabs is frustrating, and opening a few elements in new tabs is probably quite common.

We could store the dropdowns state of the display Pinia store in local storage, which would preserve the state of the details panel dropdowns after closing a tab and share it with newly opened tabs.