RainbowNavigation

Enables animated changes to UINavigationBar background during push and pop operations, as demonstrated in the demo GIFs and through the RainbowColorSource protocol.

Provides simple API methods like df_setBackgroundColor(.clear) and df_reset() to manage navigation bar transparency without complex setup, as shown in the usage section.

Includes df_setStatusBarMaskColor() to add a customizable color mask over the status bar, enhancing visual cohesion with the navigation bar, as detailed in the README.

Uses the RainbowColorSource protocol to let view controllers specify colors dynamically, making it easy to integrate with existing navigation patterns without subclassing.