lakasir/lakasir_flutter ? reverse-engineered prompt

Build me a Flutter mobile app for a point of sale system called Lakasir. It should feel like a practical companion app for running a shop on the go, where I can manage sales transactions, keep track of products and stock, and quickly see simple reports and basic accounting info.

I want the app to include a clean dashboard, cashier style transaction flow, product and inventory management, and pricing that can handle different unit prices and special friend prices. It should work on mobile and also run on the web if possible, and it should be set up to connect to a backend through an environment based base URL and Firebase.

Please make it ready to run locally with a simple setup, use the existing assets and branding style, and keep the experience straightforward for store staff who just want to sell things, check stock, and review sales without a lot of extra steps. If you need current Flutter or Firebase setup details, look them up online first.