Show HN: PaperMono, e-ink fridge magnet shopping list with mobile web page

A user has created a shopping list on an M5Stack PaperMono board, an ESP32-S3-based e-ink touchscreen device, with a mobile web app for syncing and management. The device is fully functional offline and uses Wi-Fi for syncing. The firmware is approximately 2,400 lines of C++ code, generated by Claude Code. The device is being used daily by the user's family.