Tests updates and other fixes (#27)

This PR contains the work done to update the live test data to its latest version. Plus other improvements have been made:

* conformed the `AmiiboServiceError` error to the `LocalizableError` protocol,
* improved the `ISODateTimeTranscoder` transcoder to handle the decoding of both ISO dates and timestamps,
* removed a force-unwrapped from the `AmiiboLiveClient` type.

Reviewed-on: #27
Co-authored-by: Javier Cicchelli <javier@rock-n-code.com>
Co-committed-by: Javier Cicchelli <javier@rock-n-code.com>

Sources/AmiiboService/Public/Clients/AmiiboLiveClient.swift

@@ -29,10 +29,13 @@ public struct AmiiboLiveClient: Sendable {
     /// Initializes this client with a transport for performing HTTP operations.
     /// - Parameter transport: A transport that performs HTTP operations. Defaults to a `URLSessionTransport` using the shared session.
     public init(transport: any ClientTransport = URLSessionTransport()) {
+        guard let serverURL = try? Servers.Server1.url() else {
+            fatalError("The server URL defined in the OpenAPI specification could not be resolved. Verify that the 'openapi.yaml' server definition is valid.")
+        }
+        
         self.client = .init(
-            // The force unwrapping implemented below assumes that the server definition from the OpenAPI specification is correct.
-            serverURL: try! Servers.Server1.url(),
-            configuration: .init(dateTranscoder: ISOTimestampTranscoder()),
+            serverURL: serverURL,
+            configuration: .init(dateTranscoder: ISODateTimeTranscoder()),
             transport: transport
         )
     }

Sources/AmiiboService/Public/Errors/AmiiboServiceError.swift

@@ -1,17 +1,19 @@
 // ===----------------------------------------------------------------------===
-// 
+//
 // This source file is part of the Amiibo Service open source project
-// 
+//
 // Copyright (c) 2026 Röck+Cöde VoF. and the Amiibo Service project authors
 // Licensed under Apache license v2.0
-// 
+//
 // See LICENSE for license information
 // See CONTRIBUTORS for the list of Amiibo Service project authors
 //
 // SPDX-License-Identifier: Apache-2.0
-// 
+//
 // ===----------------------------------------------------------------------===
 
+import Foundation
+
 /// A representation of all the possible errors that the ``AmiiboService`` service could throw.
 public enum AmiiboServiceError: Error {
     /// The request was malformed or contained invalid filter parameters.
@@ -33,3 +35,23 @@ public enum AmiiboServiceError: Error {
 // MARK: - Equatable
 
 extension AmiiboServiceError: Equatable {}
+
+// MARK: - LocalizedError
+
+extension AmiiboServiceError: LocalizedError {
+
+    // MARK: Properties
+
+    public var errorDescription: String? {
+        switch self {
+        case .badRequest: "The request was malformed or contained invalid filter parameters."
+        case .cancelled: "The request was cancelled before a response was received."
+        case .decoding: "The response body could not be decoded into the expected model."
+        case .notAvailable: "The backend service is currently unreachable due to a network or server issue."
+        case .notFound: "No results were found matching the given filter criteria."
+        case .undocumented(let statusCode): "The server returned an undocumented HTTP status code: \(statusCode)."
+        case .unknown: "An unexpected error occurred."
+        }
+    }
+
+}