How do you build a custom SwiftUI Layout?
WHAT IT TESTS: SwiftUI's Layout protocol for bespoke arrangements. OUTLINE: conform to Layout, implement sizeThatFits to report the container size for a proposal, and placeSubviews to position each subview using its measured size.
WHAT IT TESTS: whether you can build true custom layouts using the Layout protocol introduced in iOS 16. ANSWER OUTLINE: create a type conforming to Layout; sizeThatFits receives a proposed size and the subviews and returns the size your container needs; placeSubviews receives the final bounds and places each subview by calling place(at:anchor:proposal:); you query each subview's dimensions via the Subviews proxy and can pass a cache.
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