Worked on foundational cross-platform UI preparation in the guardian/source-apps repository, focusing on aligning iOS and macOS targets for future compatibility. Used Swift and SwiftUI to implement conditional compilation, gating several UI components to iOS with #if os(iOS) directives. Updated the macOS deployment target to version 15.0, ensuring consistency across platforms and reducing future maintenance overhead. This groundwork established a safer path toward multi-platform support by minimizing platform-specific code and simplifying future refactoring. The work did not involve bug fixes but laid the technical foundation for cross-platform UI parity, leveraging Xcode project configuration and iOS development best practices throughout.