iorodeo/potentiostat ? reverse-engineered prompt

Build me a simple control app for the Rodeostat potentiostat so I can connect to the device over USB or serial, choose a test, send the command, and watch the results in a clean interface.

I want it to support the common electrochemistry routines mentioned in the project, like constant voltage, cyclic voltammetry, sinusoidal voltammetry, linear sweep voltammetry, chronoamperometry, and multistep runs. It should talk to the firmware using the JSON message style the device already uses, and it should be easy to add new test types later.

Please also include a basic way to view and save the measured data, plus a simple setup screen for selecting voltage and current ranges. If there are any missing details, look at the existing docs and current project info online and match the project as closely as you can.