Validating 10,000-Row CSV Uploads in 20ms Before Touching Your Server (React + IndexedDB)

<p>Watch someone import a 10,000-row billing CSV over spotty Wi-Fi on a standard web app. They pick the file, wait ten seconds for the progress bar to crawl to 100%, and get bounced back by a red toast: 400 Bad Request: Invalid amount on row 7,500. So they fix row 7,500, re-upload the entire file, and discover another typo on row 8,102.</p> <p>If their connection drops while they are editing rows

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