Progressive Blur Header Swiftui

This is a production-ready SwiftUI package that nails the sticky header blur effect you see in Apple Music, Photos, and the App Store. It uses VariableBlur under the hood (the same private API Apple uses, but App Store approved) and handles the tricky bits like progressive blur radius and adaptive tinting automatically. The API is two ViewBuilder closures: one for your header, one for scrollable content. Ships with sensible defaults but you can tune maxBlurRadius, fadeExtension, and tint opacity. Two critical rules: never put an opaque background on your header views, and don't clip your content. Requires iOS 16+.