LCA-ActivityBrowser/activity-browser — reverse-engineered prompt

Build me an open source desktop app for life cycle assessment that feels like a friendly Activity Browser for Brightway2. I want people who already have Brightway projects to open them, browse databases and activities, model scenarios and parameters, then run LCA calculations without living in Python notebooks.

It should support multiple reference flows, impact categories, and scenarios, and show results in clear views like contribution analysis, Sankey diagrams, Monte Carlo results, global sensitivity analysis, and a graph explorer. Please include a way to handle uncertainties, prospective databases from premise if possible, and a simple plugin system so researchers can extend it later.

Make it work on Windows, Mac, and Linux, with sensible install and launch instructions. The interface should be practical for researchers, not flashy. Please include tests where they make sense, and look up the current Brightway and Qt docs online if you need to.