Your question is Design Real-Time Mobile Data Sync. Take a moment with it on the right.
Talk me through your thinking if you like. When you're confident, submit your answer and I'll grade it like a real screen (7/10 or better passes).
Design a mobile app architecture that keeps data fresh in near real time while still supporting offline use. Explain how the client receives updates, stores local state, handles concurrent edits, and recovers from network failures.