Room navigation rail
For better overview and navigation within a room a navigation rail should be introduced and the room overview should be added to navigation.
Non navigation functionality as e.g. focus mode could be moved to the right side to clearly seperate it from the navigation.
The navigation rail could later be extended to expanding a sidenav. See #820 (closed) for this.
When navigation rail is used for all navigation inside a room we could consider to rework the back navigation and add the room name to the header toolbar.
Depends on #909 (closed)
Edited by Lukas Weingarten