feat: add bg front matter

app/(app)/books/bg/[chapter]/page.tsx

@@ -3,9 +3,13 @@ export const dynamic = "force-dynamic";
 import type { Metadata } from "next";
 import { redirect } from "next/navigation";
 import { notFound } from "next/navigation";
-import { getChapterVerseIndex } from "@/lib/api";
+import Link from "next/link";
+import { getChapterVerseIndex, getProseChapter } from "@/lib/api";
 import { buildOgMeta } from "@/lib/og";
 import { BOOK_NAMES } from "@/lib/constants";
+import { Card, CardContent } from "@/components/ui/card";
+import { PageHeader } from "@/components/layout/page-header";
+import { FindInPage } from "@/components/layout/find-in-page";
 
 export async function generateMetadata({
   params,
@@ -13,6 +17,14 @@ export async function generateMetadata({
   params: Promise<{ chapter: string }>;
 }): Promise<Metadata> {
   const { chapter } = await params;
+  // Non-numeric segments are front matter (dedication, foreword, …).
+  if (isNaN(parseInt(chapter))) {
+    const segment = await getProseChapter("bg", 0, chapter);
+    return buildOgMeta({
+      title: BOOK_NAMES["bg"],
+      detail: segment?.title ?? "Front Matter",
+    });
+  }
   return buildOgMeta({ title: BOOK_NAMES["bg"], detail: `Chapter ${chapter}` });
 }
 
@@ -22,6 +34,50 @@ export default async function ChapterPage({
   params: Promise<{ chapter: string }>;
 }) {
   const { chapter } = await params;
+
+  // Front matter — non-numeric slugs (dedication, foreword, preface,
+  // introduction, disciplic-succession) resolve to prose intro-segments.
+  if (isNaN(parseInt(chapter))) {
+    const segment = await getProseChapter("bg", 0, chapter);
+    if (!segment) notFound();
+
+    return (
+      <div className="min-h-screen bg-background">
+        <PageHeader sticky>
+          <Link
+            href="/books/bg"
+            className="text-sm text-muted-foreground hover:text-foreground transition-colors"
+          >
+            &larr; {BOOK_NAMES["bg"]}
+          </Link>
+          <div className="mt-3 flex items-start justify-between gap-3">
+            <h1 className="text-2xl font-bold text-foreground">
+              {segment.title}
+            </h1>
+            <FindInPage targetId="book-content" className="shrink-0 mt-0.5" />
+          </div>
+        </PageHeader>
+
+        <main className="max-w-5xl mx-auto px-6 py-8">
+          <Card id="book-content">
+            <CardContent className="py-8 px-6 sm:px-8">
+              <div className="space-y-4">
+                {segment.paragraphs.map((paragraph, i) => (
+                  <div
+                    key={i}
+                    className="text-base text-foreground leading-relaxed"
+                    dangerouslySetInnerHTML={{ __html: paragraph }}
+                  />
+                ))}
+              </div>
+            </CardContent>
+          </Card>
+        </main>
+      </div>
+    );
+  }
+
+  // Numeric chapters — redirect to the first verse.
   const verseIndex = await getChapterVerseIndex("bg", null, parseInt(chapter));
   if (verseIndex.length === 0) {
     notFound();

app/(app)/books/bg/page.tsx

@@ -1,7 +1,7 @@
 import type { Metadata } from "next";
 import Link from "next/link";
 import { notFound } from "next/navigation";
-import { getBookMeta } from "@/lib/api";
+import { getBookMeta, getProseChapters } from "@/lib/api";
 import { ogForBook } from "@/lib/og";
 import { PageHeader } from "@/components/layout/page-header";
 import { Card, CardContent } from "@/components/ui/card";
@@ -18,7 +18,10 @@ type ChapterInfo = {
 };
 
 export default async function BgPage() {
-  const meta = await getBookMeta("bg");
+  const [meta, introSegments] = await Promise.all([
+    getBookMeta("bg"),
+    getProseChapters("bg", 0, "intro-segment"),
+  ]);
   if (!meta) notFound();
 
   const intro = meta as unknown as {
@@ -43,7 +46,39 @@ export default async function BgPage() {
         </h1>
         <p className="mt-1 text-muted-foreground">{intro.author}</p>
       </PageHeader>
-      <main className="max-w-5xl mx-auto px-6 py-8">
+      <main className="max-w-5xl mx-auto px-6 py-8 space-y-8">
+        {/* Front Matter */}
+        {introSegments.length > 0 && (
+          <div>
+            <h2 className="text-sm font-bold uppercase tracking-wider text-muted-foreground mb-3">
+              Front Matter
+            </h2>
+            <Card className="divide-y divide-border py-0">
+              <CardContent className="p-0">
+                <ul className="divide-y divide-border">
+                  {introSegments.map((seg) => (
+                    <li key={seg.slug}>
+                      <Link
+                        href={`/books/bg/${seg.slug}`}
+                        className="flex px-5 py-4 hover:bg-muted transition-colors"
+                      >
+                        <p className="font-medium text-foreground">
+                          {seg.title}
+                        </p>
+                      </Link>
+                    </li>
+                  ))}
+                </ul>
+              </CardContent>
+            </Card>
+          </div>
+        )}
+
+        {/* Chapters */}
+        <div>
+          <h2 className="text-sm font-bold uppercase tracking-wider text-muted-foreground mb-3">
+            Chapters
+          </h2>
           <Card className="divide-y divide-border py-0">
             <CardContent className="p-0">
               <ul className="divide-y divide-border">
@@ -57,7 +92,9 @@ export default async function BgPage() {
                         <span className="text-sm text-primary font-medium">
                           Chapter {ch.number}
                         </span>
-                      <p className="font-medium text-foreground">{ch.title}</p>
+                        <p className="font-medium text-foreground">
+                          {ch.title}
+                        </p>
                       </div>
                       <span className="text-sm text-muted-foreground sm:shrink-0 sm:ml-4">
                         <ExtractedVerseCount count={ch.totalVerses} />
@@ -68,6 +105,7 @@ export default async function BgPage() {
               </ul>
             </CardContent>
           </Card>
+        </div>
       </main>
     </div>
   );