投影转换器

This is a milestone update. PJ Converter has been rebuilt from the ground up using the latest SwiftUI technology, delivering a faster, more powerful, and more modern professional tool. Here's what's new in this major update: * [A FRESH NEW LOOK] Completely Redesigned UI * The app has been rewritten entirely. It's faster, more responsive, and features a modern design with fluid animations. * Native Dark Mode: Perfectly integrated with iOS Dark Mode for a more comfortable viewing experience in low-light conditions. * [MAJOR FEATURE LEAP] More Powerful Conversions * Degree/Radian Switching: Seamlessly switch geographic coordinates between degrees (DMS) and radians to meet diverse data requirements. * Upgraded Map Picker: The map picker can now directly return values in degrees for a more intuitive workflow. * [SMARTER MANAGEMENT] A More Professional Projection Library * Real-Time Validation: The custom projection editor now validates your parameters in real-time and warns of potential ID conflicts, making configuration safer. * Recents: Your most frequently used coordinate systems now automatically appear at the top of the list for quick access. * [REWRITTEN CORE] A More Stable Foundation We've overhauled the data layer for faster and more reliable access to your custom and recent projections. We've also introduced new observability tools, which will help us find and fix issues even faster in the future. We believe this upgrade will lead to a more efficient and enjoyable workflow. We hope you enjoy it.