masking logic for APIKey

Features/Sources/Settings/String.swift → Features/Sources/Settings/APIKey.swift

@@ -1,6 +1,8 @@
-extension String {
+import Models
+
+extension APIKey {
     var masked: String? {
-        guard let first else {
+        guard let first = rawValue.first else {
             return nil
         }
         return "\(first)***"

Features/Sources/Settings/Settings/SettingsView.swift

@@ -28,7 +28,7 @@ public struct SettingsView: View {
 
                             Spacer()
 
-                            Text(store.apiKey.rawValue.masked ?? "None")
+                            Text(store.apiKey.masked ?? "None")
                                 .foregroundStyle(Color.secondary)
                         }
                     }

Features/Tests/SettingsTests/APIKeyTests.swift

@@ -0,0 +1,15 @@
+import Models
+import Testing
+
+@testable import Settings
+
+struct APIKeyTests {
+    @Test
+    func masked() {
+        var key = APIKey(rawValue: "")
+        #expect(key.masked == nil)
+
+        key = .init(rawValue: "test")
+        #expect(key.masked == "t***")
+    }
+}