OpenRefine/OpenRefine ? reverse-engineered prompt

Build me a desktop tool that runs locally in the browser for cleaning up messy data. I want to be able to load CSV or similar files, inspect columns, spot bad values, remove duplicates, split and merge text, fix formatting, and undo changes easily. It should also help me match records against external sources, like people, places, or organizations, and enrich rows with information from the web when possible. Keep the experience simple and fast, with everything happening on my own computer so the data stays private.

Make it feel like a powerful spreadsheet helper for non experts, with a clear table view, useful transformation actions, and a way to save the cleaned result back out again. If you need to check current docs or best practices for any part of it, look them up online first.