fix(shell-docs): collapse legacy /frontend-actions into /frontend-tools

content/docs/frontend-actions.mdx was a 33-line stub from when the
feature was called "Frontend Actions." The product API is now
exclusively useFrontendTool, the canonical page is /frontend-tools
(1967 bytes, snippet_cell-driven, in the App Control sidebar
section), and the orphan stub had no entry in any meta.json — it
only rendered if you typed /frontend-actions directly.

Per the IA analysis: "redirect or delete; pick one." Picked both:
delete the orphan file + add a 301 redirect /frontend-actions →
/frontend-tools so any external link (search results, blog posts,
customer docs) lands cleanly on the canonical page.

Other 'frontend-actions' references in the repo are stable HTML
anchor IDs (`id="frontend-actions-example"` in 12 integration
`frontend-tools.mdx` files) and external links to the legacy
docs.copilotkit.ai site — neither breaks.

Author: samjulien

showcase/shell-docs/next.config.ts

@@ -46,6 +46,27 @@ if (!process.env.NEXT_PUBLIC_SHELL_URL) {
   );
 }
 
-const nextConfig: NextConfig = {};
+const nextConfig: NextConfig = {
+  // Permanent redirects for legacy URL slugs that have been renamed or
+  // collapsed into a canonical page. Each entry exists because at least
+  // one external link (search-engine result, blog post, customer doc)
+  // is known to point at the old slug; we'd rather 301 cleanly than
+  // 404 the visitor.
+  async redirects() {
+    return [
+      // /frontend-actions was the original name for this page; the
+      // feature is now exposed exclusively as `useFrontendTool`, the
+      // page is titled "Frontend Tools" and lives at /frontend-tools.
+      // The old MDX file at content/docs/frontend-actions.mdx was a
+      // stub orphan unreachable from the sidebar; it's been deleted
+      // alongside this redirect.
+      {
+        source: "/frontend-actions",
+        destination: "/frontend-tools",
+        permanent: true,
+      },
+    ];
+  },
+};
 
 export default nextConfig;