fix: og image generation

app/letters/page.tsx

@@ -1,7 +1,9 @@
 export const dynamic = "force-dynamic";
 
+import type { Metadata } from "next";
 import Link from "next/link";
 import { PageHeader } from "@/components/page-header";
+import { buildOgMeta } from "@/lib/og";
 import {
   getLetterYears,
   getLetterRecipients,
@@ -11,6 +13,15 @@ import {
 import { LettersNav } from "./letters-nav";
 import { LettersBrowser } from "./letters-browser";
 
+export function generateMetadata(): Metadata {
+  return buildOgMeta({
+    title: "Letters",
+    detail: "6,800+ letters (1947–1977)",
+    quote:
+      "Personal correspondence by Śrīla Prabhupāda — guiding disciples, Godbrothers, and well-wishers in the science of Kṛṣṇa consciousness.",
+  });
+}
+
 export default async function LettersPage({
   searchParams,
 }: {