When working with an iOS 17 @Observable class in SwiftUI views, using "who owns it" and "how is it passed" as the criteria, when do you use @State, a plain property, @Bindable, and @Environment?
The view that creates it owns it with @State; a view that receives it and only reads uses let/var; a view that receives it and needs bindings ($) uses @Bindable; and sharing across the whole hierarchy uses .environment plus @Environment(Type.self).
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