JayanGupta/AutoData ? reverse-engineered prompt

Build me a local data analysis web app where I can upload a CSV or Excel file and instantly see what is inside it.

I want it to profile the dataset, flag missing values, duplicates, outliers, weird columns, and possible sensitive data, then give me simple cleaning tools like fill missing values, trim text, convert types, rename or drop columns, and undo changes if I mess up. It should also make useful charts automatically, like histograms, bar charts, scatter plots, correlations, and a few more advanced views for exploring patterns.

Please add a simple dataset library so every upload is saved locally, with search, favorites, rename, duplicate, and delete. I also want an AI style chat box where I can ask questions about the data in plain English, but the answers should stay grounded in the actual dataset and work locally even if I do not add any API key. Finally, let me export the cleaned data and download a report as Markdown, HTML, or PDF.