I own a small store that sells electronics, appliances, and furniture, and I’d like a straightforward mobile app my customers can use on both iOS and Android. I’m keeping the first release lean—function over flair—so I can stay within budget and still get something live quickly. Core requirements Must be smooth. Every click, every scroll should be smooth. It Should look simple and elegant. • Phone number verification & WhatsApp Login for sign-in (OTP) • Product catalog that lets users browse items by category • Simple shopping cart with quantity updates and promo-code support if it’s easy to bolt on • Order tracking screen so customers can see status changes in real time • Payment integration for Credit/Debit cards and Bank transfers, plus a Cash on Delivery option at checkout I DONT CARE HOW ANYONE DOES IT, I JUST NEED AN APP WHICH WILL RUN SMOOTH AND WIL BE EASY FOR MY CUSTOMERS TO PURCAHSE. I’m fine with React Native, Flutter, or any other framework you’re comfortable with as long as it produces clean iOS and Android builds. A lightweight admin panel or JSON feed I can update myself would be helpful, but the main goal is a working prototype that customers can download and use from day one. Please outline how you’d structure the app, mention any third-party services you’d rely on (OTP gateway, payment SDKs, hosting), and give me an estimated timeline for an MVP.