Merge remote-tracking branch 'origin/release/10.2.0' into release/10.2.0

src/Umbraco.PublishedCache.NuCache/ContentCache.cs

@@ -243,7 +243,7 @@ public class ContentCache : PublishedCacheBase, IPublishedContentCache, INavigab
             IPublishedContent? rootNode = GetByRoute(preview, "/", true);
             if (rootNode == null)
             {
-                throw new Exception("Failed to get node at /.");
+                throw new Exception("Failed to get node at /. This might be because you're trying to publish a variant, with no domains setup");
             }
 
             // remove only if we're the default node

src/Umbraco.Web.UI.Client/src/less/components/tree/umb-tree-root.less

@@ -11,8 +11,8 @@
   }
 
   h1 {
-    font-size: 18.75px;
-    font-weight: 600;
+    font-size: @baseFontSize;
+    font-weight: 700;
     margin: 0;
     width: 100%;
     display: flex;