taeyjeong/mainbase-ios ? reverse-engineered prompt

Build me a clean iPhone app starter for a project called MainBase.

I want a simple, polished app that opens to a welcoming home screen and gives me a solid base to build from later. Keep the UI modern and easy to use, with a simple navigation flow, a couple of placeholder screens, and sensible empty states so it feels like a real app instead of a blank template.

Please make sure the project opens cleanly in Xcode, the main app target runs without issues, and the test targets are set up properly too. If anything needs to be looked up in the current Apple docs, go ahead and check online.

I do not need anything overly complex, just a nice starting point with good structure, readable code, and a UI that looks good on an iPhone right away.