garinarka/sheetto.form ? reverse-engineered prompt

Build me a simple web app that lets someone upload an Excel or CSV file and turn the rows into Google Form questions right in the browser.

I want it to support multiple choice and essay style questions, with a preview step so users can check everything before sending it to Google. It should be able to create a brand new Google Form or add questions to an existing one, and it should keep any questions that were already there when adding to an existing form. Please include a quiz mode option, a title and description field, and a clear progress indicator while the form is being created.

The file should be processed locally in the browser, not uploaded to our server. Use Google sign in and Google Forms access so the user can connect their account and choose where the questions go. Make the interface clean and easy to use, and include a sample format or guidance for the spreadsheet headers, including English and Indonesian labels if possible. If you need current docs for Google setup, look them up online.