fix: bg chapter verse index

app/books/bg/[chapter]/[verse]/page.tsx

@@ -43,15 +43,17 @@ export default async function VersePage({
   );
   if (!verse) notFound();
 
-  // Build mobile nav groups — single flat list of chapters
+  // Build mobile nav groups — verses for the current chapter
   const mobileNavGroups: MobileNavGroup[] = [
     {
-      title: "Chapters",
-      items: bgMeta.chapters.map((ch) => ({
-        slug: `${ch.number}`,
-        label: `${ch.number}. ${ch.title}`,
-        href: `/books/bg/${ch.number}/1`,
-        type: "chapter",
+      title: "Verses",
+      items: verseIndex.map((v) => ({
+        slug: String(v.verse),
+        label: v.verseEnd
+          ? `Verse ${chapter}.${v.verse}–${v.verseEnd}`
+          : `Verse ${chapter}.${v.verse}`,
+        href: `/books/bg/${chapter}/${v.verse}`,
+        type: "verse",
       })),
     },
   ];
@@ -85,7 +87,7 @@ export default async function VersePage({
           basePath={`/books/bg/${chapter}`}
           showBengali={false}
           mobileNavGroups={mobileNavGroups}
-          mobileNavBookTitle="Bhagavad-gītā As It Is"
+          mobileNavBookTitle={`Chapter ${chapter}: ${title}`}
         />
       </div>
     </div>