Hero Expand Card

1/// One story in a `HeroExpandCardFeed`. Artwork is a mesh gradient plus an2/// SF Symbol, so the snippet needs no image assets.3public struct HeroExpandCardItem: Identifiable {4    public let id: String5    let eyebrow: String6    let title: String7    let subtitle: String8    let systemImage: String9    /// 9 colors for a 3×3 mesh gradient.10    let colors: [Color]11    let paragraphs: [String]12​13    public init(14        eyebrow: String,15        title: String,16        subtitle: String,17        systemImage: String,18        colors: [Color],19        paragraphs: [String]20    ) {21        precondition(colors.count == 9, "HeroExpandCardItem needs 9 colors (3×3 mesh).")22        self.id = eyebrow + title23        self.eyebrow = eyebrow24        self.title = title25        self.subtitle = subtitle26        self.systemImage = systemImage27        self.colors = colors28        self.paragraphs = paragraphs29    }30}