feat(reader): add slim reader footer

marketing-site/components/reader/ReaderFooter.jsx

@@ -0,0 +1,32 @@
+import Link from "next/link";
+
+export default function ReaderFooter() {
+  return (
+    <footer className="footer reader-footer">
+      <div className="foot-in">
+        <div className="foot-top">
+          <div>
+            <div className="logo">
+              AIBook<b>.</b>
+              <span className="dot">fun</span>
+            </div>
+            <p className="foot-blurb">
+              Reading demo. Not the live book. Workflows sit inside a chapter,
+              not on a shelf of cards.
+            </p>
+          </div>
+          <div className="foot-links">
+            <Link href="/">Home</Link>
+            <Link href="/read">Library</Link>
+            <Link href="/#get">Preview</Link>
+          </div>
+        </div>
+        <div className="colophon">
+          © 2026 WeOwnAI · MIT-licensed docs · This page is a reading-environment demo.
+          <br />
+          Activation is stored in this browser only. No chatbot. No live client data.
+        </div>
+      </div>
+    </footer>
+  );
+}