fix: keep page shells transparent

packages/cli/src/update.ts

@@ -602,6 +602,14 @@ const MIGRATIONS: Migration[] = [
       // Existing inferred declarations remain compatible; typed syntax is opt-in.
     },
   },
+  {
+    version: "0.2.60",
+    id: "page-owned-shell-backgrounds",
+    description: "Lets pages own their backgrounds by keeping shared page shells transparent.",
+    apply() {
+      // The UI stylesheet update applies automatically.
+    },
+  },
 ];
 
 /** Release tooling uses this to require an explicit migration entry per version. */