fix(coverart/test): use newHTTPClient in provider test fixtures

internal/coverart/provider_theaudiodb_test.go

@@ -28,7 +28,7 @@ func newTheAudioDBProviderForTest(t *testing.T, mockURL string) *theAudioDBProvi
 	withTheAudioDBBaseURL(t, mockURL)
 
 	p := &theAudioDBProvider{
-		client: &http.Client{Timeout: 5 * time.Second},
+		client: newHTTPClient(httpClientOptions{Name: "theaudiodb", HTTPClient: &http.Client{Timeout: 5 * time.Second}, TreatAuthAsTransient: true, BaseBackoff: time.Millisecond}),
 	}
 	Register(p)
 	p.enabled.Store(true)
@@ -234,7 +234,7 @@ func TestTheAudioDB_DefaultsToTestKeyOnEmpty(t *testing.T) {
 	defer resetRegistryForTests()
 	withTheAudioDBBaseURL(t, srv.URL)
 
-	p := &theAudioDBProvider{client: &http.Client{Timeout: 5 * time.Second}}
+	p := &theAudioDBProvider{client: newHTTPClient(httpClientOptions{Name: "theaudiodb", HTTPClient: &http.Client{Timeout: 5 * time.Second}, TreatAuthAsTransient: true, BaseBackoff: time.Millisecond})}
 	Register(p)
 	// Configure with empty key — should fall back to test key.
 	if err := p.Configure(ProviderSettings{Enabled: true, APIKey: ""}); err != nil {