auto-git:

[change] src/app/App.tsx

src/app/App.tsx

@@ -1982,6 +1982,10 @@ function formatWorldBackgroundLabel(
     return "Vertical Gradient";
   }
 
+  if (background.mode === "shader") {
+    return "Shader Sky";
+  }
+
   return "Image";
 }
 
@@ -2009,6 +2013,10 @@ function describeWorldBackground(
     return `${background.topColorHex} -> ${background.bottomColorHex}`;
   }
 
+  if (background.mode === "shader") {
+    return "Default Sky";
+  }
+
   if (background.assetId.trim().length === 0) {
     return options.emptyImageLabel ?? "Automatic fallback";
   }