Design a "toast" component for a design system. With several apps and teams using it, how would you define the public API you expose to callers, the way it's called and the options?
Pin down requirements as display conditions, variants, lifetime, interaction, and accessibility, then split the API into a value-type Toast model and a ToastPresenter protocol (or a SwiftUI modifier). Colors and spacing come from design tokens so themes and dark mode work automatically, with VoiceOver announcements and Reduce Motion handled. Verify with snapshot and unit tests, building in the order model → presenter → view → tokens → tests.
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