https://github.com/user-attachments/assets/81da68fe-bbc5-4b23-8182-923c752a8bd2
* Removes all extra elements: headers, buttons, to simplify the menu
navigation approach and save space.
Implements the keyboard navigation and panel toggling.
* Keeps the status icon and the server name, and their ordering approach
(current buffer/other) in the menu.
The status icon can still be hovered, but that is not yet possible to
trigger from the keyboard: future ideas would be make a similar side
display instead of hover, as Zeta menu does:

* Allows to start (if all are stopped) and stop (if some are not
stopped) all servers at once now with the button at the bottom
Release Notes:
- N/A