Add comprehensive test coverage for services and utilities

Co-Authored-By: Claude Haiku 4.5 <noreply@anthropic.com>

src/lib/services/playerEvents.test.ts

@@ -99,6 +99,10 @@ describe("Player Events Service", () => {
 
     await initPlayerEvents();
 
-    expect(consoleSpy).toHaveBeenCalledWith(expect.stringContaining("Failed to initialize player events"));
+    // console.error is called with: ("Failed to initialize player events:", Error)
+    expect(consoleSpy).toHaveBeenCalledWith(
+      expect.stringContaining("Failed to initialize player events"),
+      expect.any(Error)
+    );
   });
 });