[IMP] documents improve search panel and home kanban view
This commits brings changes to the search panel that should improve UX:
- When coming from another app (e.g. Projects), the COMPANY folder
stays folded...
-... and the name of the folder containing the targeted document is
displayed below the breadcrumbs, right before the cogwheel.
- "Home" background changes when you hover or select it, the same way
as for the folders.
- Deselect 'Home'* (if selected) when adding a search item.
- Clear search and order by `last_accessed_date` when clicking on 'Home'.
- When users navigate through COMPANY folders via the Kanban or the List
view, and COMPANY is folded, the search panel does not expand the visited
folders.
- Clicking on the caret before the folder name, fold/unfold the folder
without selecting it (setting it as the active folder).
- Clicking on a folder name in the search panel just select it
(no folding/unfolding).
- Main folders like 'COMPANY', that name is preceded by an icon, also
have a caret for folding/unfolding.
- Kanban view: limit pager size to 40 records.

* actually, it's just a visual trick: removing the active class from the
'Home' header element.

task-4293935