Multi-Currency Expense Tracker App

I’m building a straightforward income-expense tracker that runs natively on both iOS and Android. The core flow is simple: users add incomes or expenses, tag them as needed, and then pull clear, visual reports that show where their money goes. Key points to keep in mind: • Both platforms must work seamlessly side-by-side so a user can switch devices without losing data. • Every amount entered should be stored with its original currency and converted on demand, giving totals in any currency the user chooses. • Reports are a must—daily, weekly, monthly, and custom date ranges—exportable to PDF or CSV for easy sharing. Clean architecture, secure authentication, and a lightweight, intuitive UI are priorities. I’d like all source code, build instructions, and a short hand-off call at the end so I can pick up maintenance on my side. If something in the scope seems unclear, let me know early and we can refine it together.