Fix server file browse flow

platform/service/durable_observability_test.go

@@ -1,7 +1,6 @@
 package service
 
 import (
-	"bytes"
 	"path/filepath"
 	"testing"
 	"time"
@@ -91,8 +90,8 @@ func TestFileArtifactBodyStoreResumesTransferAfterServiceRestart(t *testing.T) {
 	if err != nil {
 		t.Fatalf("final restart service: %v", err)
 	}
-	stored, err := finalService.artifactPayload("durable-artifact")
-	if err != nil || !bytes.Equal(stored, payload) {
+	stored, err := finalService.artifactStore.ReadPayloadRange("durable-artifact", 0, len(payload))
+	if err != nil || string(stored) != string(payload) {
 		t.Fatalf("expected durable payload after restart, payload=%q err=%v", stored, err)
 	}
 }