fix: make PlayolaNetworkLoggingSession Sendable

Addresses PR review (P2): the wrapper crosses actor boundaries
(@mainactor PlayolaStationPlayer awaits data(for:)), so declare explicit
Sendable conformance. The sound fix constrains the wrapped base to
'any URLSessionProtocol & Sendable' (URLSession already conforms) rather
than papering over a non-Sendable stored property. Test doubles passed to
the wrapper are marked Sendable accordingly.

Author: briankeane

Sources/PlayolaCore/Protocols/PlayolaNetworkLoggingSession.swift

@@ -14,12 +14,12 @@ import Foundation
 /// session returns and rethrows any error unchanged — it never swallows or
 /// alters the result. When ``PlayolaNetworkLogger/handler`` is `nil` no event
 /// is built and the wrapper adds negligible overhead.
-public struct PlayolaNetworkLoggingSession: URLSessionProtocol {
-  private let base: URLSessionProtocol
+public struct PlayolaNetworkLoggingSession: URLSessionProtocol, Sendable {
+  private let base: any URLSessionProtocol & Sendable
   private let dateProvider: DateProviderProtocol
 
   public init(
-    wrapping base: URLSessionProtocol,
+    wrapping base: any URLSessionProtocol & Sendable,
     dateProvider: DateProviderProtocol = DateProvider.shared
   ) {
     self.base = base

Tests/PlayolaPlayerTests/PlayolaNetworkLoggingSessionTests.swift

@@ -30,7 +30,7 @@ private final class QueueDateProvider: Sendable, DateProviderProtocol {
 
 /// A session that always throws, to verify error pass-through.
 private struct ThrowingURLSession: URLSessionProtocol {
-  let error: Error
+  let error: any Error & Sendable
   func data(for request: URLRequest) async throws -> (Data, URLResponse) { throw error }
 }
 

Tests/PlayolaPlayerTests/Test Utilities/MockUrlSession.swift

@@ -8,7 +8,7 @@ import Foundation
 
 @testable import PlayolaPlayer
 
-class MockURLSession: URLSessionProtocol {
+final class MockURLSession: URLSessionProtocol, @unchecked Sendable {
   var responses: [(Data, URLResponse)] = []
   var requestCallCount = 0
   var lastRequest: URLRequest?