add button "flowcell/optics" in preview

# Motivation

There are different maximum flow rates to protect the flow cell from leakage under excessive pressure, but it is not possible to indicate the current flow cell in the preview. Therefore, several maximum flow rate thresholds have to be set.

# ToDo

Implement a system for indicating which flow cell is currently in place. 
Ideas; use of color code as done with the hardware?
