Yattee v2 rewrite

Yattee/Models/GitHubContributor.swift

@@ -0,0 +1,20 @@
+//
+//  GitHubContributor.swift
+//  Yattee
+//
+//  Data model for GitHub contributor information.
+//
+
+import Foundation
+
+/// A GitHub repository contributor.
+struct GitHubContributor: Identifiable, Decodable, Sendable {
+    let id: Int
+    let login: String
+    let avatarUrl: String
+    let htmlUrl: String
+    let contributions: Int
+
+    var avatarURL: URL? { URL(string: avatarUrl) }
+    var profileURL: URL? { URL(string: htmlUrl) }
+}