feat(seo): add sitemap generator

app/(app)/books/chapter-viewer.tsx

@@ -7,6 +7,9 @@ import { Badge } from "@/components/ui/badge";
 import { Button } from "@/components/ui/button";
 import { ChevronLeft, ChevronRight, Loader2 } from "lucide-react";
 import { MobileNav, type MobileNavGroup } from "@/components/layout/mobile-nav";
+import { JsonLd } from "@/components/seo/json-ld";
+import { articleJsonLd } from "@/lib/jsonld";
+import { BOOK_NAMES } from "@/lib/constants";
 
 // ---------------------------------------------------------------------------
 // Types
@@ -389,6 +392,19 @@ export function ChapterViewer({
 
   return (
     <>
+      {/* Structured data for the currently-shown verse (SSR'd for the initial
+          verse, updates on client navigation). */}
+      {currentVerse ? (
+        <JsonLd
+          data={articleJsonLd({
+            path: `${basePath}/${currentVerseNum}`,
+            headline: `${BOOK_NAMES[book] ?? book} ${currentVerse.reference}`,
+            description: currentVerse.translation,
+            isPartOf: BOOK_NAMES[book] ?? book,
+          })}
+        />
+      ) : null}
+
       {/* ---- Sidebar: Verse Index ---- */}
       {/* Sticky sidebar. The max-h leaves 76px at the viewport bottom for
           the site footer so the sidebar doesn't slide behind it when the