I have an existing Flutter code-base that needs to be pared down to a fast, order-only experience. The goal is to let users scroll through products, pick quantities, and submit an order—nothing more. What has to change • Product list – Display just one item per row with its image stretched full width. – Place a “- 1 +” quantity selector and an “Add to Cart” button right on that row; no tap-through screens or pop-ups. – Scrolling must stay buttery-smooth even on long lists (no freezes, jank, or frame drops). • Login – Keep mobile-phone OTP verification only. Strip out social, e-mail, or any other methods. • Checkout flow – Eliminate all payment screens and gateways. After the cart, users simply tap “Submit Order.” • Customer ↔ Seller visibility (same logic we use in Clamsi) – A customer sees only the sellers that have granted permission; every other seller and their products stay hidden. Technical expectations I’ll give you the current repository plus a quick diagram of the desired screen flow. Your job is to refactor the UI, remove unneeded auth/payment code, and implement the permission filter while preserving performance. Final testing will be done on both Android and iOS emulators; I’ll consider it done when: 1. The product list meets the layout specs. 2. OTP login is the sole auth path. 3. Submitting an order succeeds without payment prompts. 4. Hidden sellers never appear, even via deep link or search. 5. Scroll performance stays ≥60 fps on a mid-range device running release mode. Let me know your turnaround time and any Flutter packages you’d lean on so we can align before you dive in.