Add registry kind indexes and entity pages.

CONTENT-WP-0002-T02 reads kinds from each snapshot and serves both example dataspaces without oncology imports.

Assistant: grok
Assistant-Session: 01a1346c-fdff-7741-b1af-b7283661554b

ui/components/DataspaceHome.tsx

@@ -0,0 +1,31 @@
+import { Hero } from "@/components/Hero";
+import { RecordBrowser } from "@/components/RecordBrowser";
+import { findDataspace, listNavigation } from "@/lib/catalog";
+import { notFound } from "next/navigation";
+
+export function DataspaceHome({ id }: { id: string }) {
+  const dataspace = findDataspace(id);
+  if (!dataspace) notFound();
+  const others = listNavigation().filter((item) => item.id !== dataspace.id);
+  return (
+    <>
+      <Hero
+        dataspace={dataspace.title}
+        description={dataspace.description}
+        kinds={dataspace.kinds.map((kind) => ({ href: kind.href, label: kind.plural }))}
+      />
+      {others.length > 0 ? (
+        <p className="mx-auto max-w-7xl px-4 pt-8 text-sm text-muted sm:px-6">
+          Other fields:{" "}
+          {others.map((item, index) => (
+            <span key={item.id}>
+              {index > 0 ? ", " : null}
+              <a className="underline" href={`/${item.id}/`}>{item.title}</a>
+            </span>
+          ))}
+        </p>
+      ) : null}
+      <RecordBrowser rows={dataspace.rows} />
+    </>
+  );
+}