labasubagia/pos-umkm — reverse-engineered prompt

Build me a simple web based Point of Sale app for Indonesian UMKM owners. I want it to run as a static website, with no backend server, where the business owner signs in with their Google account and the sales data is saved in Google Sheets in their own Google Drive.

Make it feel easy for a small shop to use. They should be able to open the app, sign in, record sales, see basic transaction information, and keep their data safely in a spreadsheet they control. Use Indonesian friendly wording where it makes sense.

Please build it with React, TypeScript, Vite, and Tailwind, and make it ready to deploy to GitHub Pages, Netlify, or Vercel. Include the environment setup using a local env file, and make sure the app can be developed with npm run dev and built with npm run build.

Add reasonable tests for the important parts, and mock Google Sheets in tests so nothing touches a real spreadsheet.