fix: og image for glossary

lib/source-reference.ts

@@ -164,8 +164,27 @@ export function getSourceReference(): {
     return { title: parentTitle, detail: chapterTitle, url };
   }
 
-  // /glossary — general
+  // /glossary/[letter]?term=...
   if (parts[0] === "glossary") {
+    const h1 = document.querySelector("h1");
+    const termFromH1 = h1?.textContent?.replace(/^Glossary:\s*/, "").trim();
+
+    // Try to get the term from the URL ?term= param
+    const urlParams = new URLSearchParams(window.location.search);
+    const termFromUrl = urlParams.get("term");
+
+    const term = termFromUrl || termFromH1 || null;
+
+    if (term) {
+      return { title: term, detail: "Glossary — Prabhupāda Says", url };
+    }
+
+    // Fallback: letter-level
+    const letter = parts[1]?.toUpperCase();
+    if (letter) {
+      return { title: `Glossary — ${letter}`, detail: null, url };
+    }
+
     return { title: "Glossary", detail: null, url };
   }