romanejaquez/laundry-app-flutter ? reverse-engineered prompt

Build me a Flutter app for a small laundry shop that works like a simple point of sale system.

It should run nicely on a mini PC for the front counter, but also feel usable on a phone for QR code scanning. I want it to connect to Firebase so orders and customer info can update in real time. The main flow should let staff create and manage laundry orders, look up customers, track status, and print receipts to a Brother P Touch Cube printer.

Make the layout responsive so it looks good on both larger screens and mobile screens. If there are any parts where current Flutter or Firebase docs would help, look them up online and use the best approach. If it makes sense, leave clean spots for future Stripe payments and NFC support, but focus on getting the core POS and receipt printing experience working first.