refactor(pages,a11y,seo): enhance subpage metadata, semantic HTML, accessibility, and E2E regression tests

- Standardize Next.js Metadata and dynamic generateMetadata across all subpages
- Fix duplicate main landmark in publications page by replacing nested main with div
- Unify Members page spacing (space-y-10 sm:space-y-14, pt-6 md:pt-8) and responsive H2s
- Add aria-label and focus ring to CategoryNav View All links for a11y
- Derive dynamic course history semester ranges in Lectures page
- Add 3 comprehensive E2E test cases (test_08, test_09, test_10) for highlights, active border, CITE brand links, and English H1 headers

refer_landing_page/app/standardization/page.tsx

@@ -1,6 +1,12 @@
 import React from "react";
+import type { Metadata } from "next";
 import { standardsBodies } from "../../content/standards";
 
+export const metadata: Metadata = {
+  title: "Standardization",
+  description: "AI Agent Networking Lab (ANL) international standardization research and contributions",
+};
+
 export default function StandardizationPage() {
   return (
     <div className="container-content py-8 sm:py-12 space-y-10 sm:space-y-14">