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();