fix(ui): honest tab titles and a download field that names every site

Signed out, the tab read Home's question over the sign-in form; the legal
pages read just "Siftlode". The download field asked only for a YouTube
link although Facebook and the rest download too.

frontend/src/components/legal/LegalLayout.tsx

@@ -71,6 +71,11 @@ export default function LegalLayout({ title, children }: { title: string; childr
     const id = decodeURIComponent(window.location.hash.slice(1));
     if (id) document.getElementById(id)?.scrollIntoView();
   }, []);
+  // The tab names the document, like every page of the app — a bookmark or a tab strip read just
+  // "Siftlode" (prod UAT 2026-09-19).
+  useEffect(() => {
+    document.title = `${title} · Siftlode`;
+  }, [title]);
   return (
     <div className="min-h-screen bg-bg text-fg">
       <div className="mx-auto w-[min(92vw,720px)] py-12">