Added the catalogue models and seed to support phase 4 of the POC prototype in the Persistence package.

Packages/Persistence/Sources/Public/Models/Listing.swift

@@ -53,6 +53,10 @@ public struct Listing: Sendable, Equatable {
     public let listedAt: Date
     /// When a sale of the copy was agreed, or `nil` while it is for sale.
     public let soldAt: Date?
+    /// The defects the seller declared, from the grading guide's checklist.
+    public let defects: [String]
+    /// The URL paths of the photos of this copy, the front first; empty while the listing shows its placeholder cover.
+    public let photos: [String]
 
     // MARK: Initializers
 
@@ -80,7 +84,9 @@ public struct Listing: Sendable, Equatable {
         acceptsOffers: Bool,
         cover: Cover,
         listedAt: Date,
-        soldAt: Date? = nil
+        soldAt: Date? = nil,
+        defects: [String] = [],
+        photos: [String] = []
     ) {
         self.slug = slug
         self.shop = shop
@@ -106,6 +112,8 @@ public struct Listing: Sendable, Equatable {
         self.cover = cover
         self.listedAt = listedAt
         self.soldAt = soldAt
+        self.defects = defects
+        self.photos = photos
     }
 
 }
@@ -116,6 +124,15 @@ public extension Listing {
 
     // MARK: Computed
 
+    /// What the seller declared of the copy's condition, in a sentence: the defects, then the notes. Frozen into a sale at agreement.
+    var declaration: String {
+        let defects = defects.isEmpty
+            ? "No defects declared."
+            : "Declared defects: \(defects.joined(separator: "; "))."
+
+        return sellerNotes.isEmpty ? defects : "\(defects) \(sellerNotes)"
+    }
+
     /// The grade or condition in a few words: `CGC 9.8` for a slab, `Raw · NM` for a raw issue, the condition alone for a collected edition.
     var gradeLabel: String {
         if let grader, let grade {