fix(runtime): stabilize navigation and custom errors

packages/ui/test/ui.test.ts

@@ -463,6 +463,23 @@ test("footer renders header and link entries with the requested column count", a
   );
 });
 
+test("footer emits valid current-page state and translation markers for data items", async () => {
+  const source = readFileSync(uiComponentPath("Footer"), "utf8");
+  const html = await renderComponent(source, {
+    items: [
+      {
+        type: "header",
+        label: "Services",
+        labelKey: "footer.services",
+        items: [{ label: "Report", labelKey: "footer.report", href: "/report" }],
+      },
+    ],
+  });
+  expect(html).toContain('data-t="footer.services"');
+  expect(html).toContain('data-t="footer.report"');
+  expect(html).not.toContain('aria-current=""');
+});
+
 test("component-system CSS includes responsive, theme-token, focus, and reduced-motion rules", () => {
   const css = uiStyles();
   expect(css).toContain("@media (max-width: 768px)");