Refresh UI components and showcase; release updated framework packages

packages/viewer/test/package-side-effects.test.ts

@@ -0,0 +1,8 @@
+import { test, expect } from "bun:test";
+import manifest from "../package.json";
+
+test("published viewer retains browser auto-mount side effects", () => {
+  // The runtime registers renderers and installs DOM/navigation listeners on import.
+  // Marking split published chunks side-effect-free drops those initializers.
+  expect(manifest.sideEffects).toBe(true);
+});