Port the explorer shell: tokens, header, hero, and a generic table.

CONTENT-WP-0002-T01 adapts the pinned OnCo visual system under ui/ without the corpus, mark, or kind routes.

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

ui/components/SiteHeader.tsx

@@ -0,0 +1,22 @@
+/**
+ * Sticky header shell adapted from OnCo SiteHeader.
+ * Copyright (c) 2026 OnCo. MIT License. See ui/NOTICE.
+ * The OnCo mark, command palette, and kind routes are not included.
+ * Kind routes arrive in CONTENT-WP-0002-T02; this header only links to the home page.
+ */
+export function SiteHeader() {
+  return (
+    <header className="sticky top-0 z-40 h-14 border-b border-border bg-background/80 backdrop-blur-md supports-[backdrop-filter]:bg-background/75">
+      <div className="mx-auto flex h-14 max-w-7xl items-center gap-6 px-4 sm:px-6">
+        <a href="/" className="inline-flex h-10 items-center rounded-lg font-semibold tracking-tight" aria-label="Content Explorer home">
+          <span className="text-[15px]">Content Explorer</span>
+        </a>
+        <nav aria-label="Primary" className="flex items-center gap-4 text-sm">
+          <a href="#records" className="text-muted hover:text-foreground">
+            Records
+          </a>
+        </nav>
+      </div>
+    </header>
+  );
+}