fix(cv): make profile saves atomic

JobTrackerApi.Tests/CvBuilderTests.cs

@@ -537,4 +537,15 @@ public sealed class CvBuilderTests
         Assert.Contains("class=\"paragraphs\"><p>I confirm these details.</p>", html);
     }
 
+    [Fact]
+    public void Settings_normalization_removes_duplicate_entry_order_keys()
+    {
+        var settings = CvVariantSettingsJson.Normalize(new CvVariantSettings
+        {
+            Sections = { new CvSectionSetting { Key = "experience", ItemOrder = new() { "first", "first", "second", " " } } },
+        });
+
+        Assert.Equal(new[] { "first", "second" }, settings.Sections[0].ItemOrder);
+    }
+
 }