Fix build: add missing extractCodeBlocks export to api.js

frontend/src/api.js

@@ -21,6 +21,29 @@ async function request(method, path, token, body) {
   return res.json();
 }
 
+// ═══════════════════════════════════════
+//  Utility: Extract fenced code blocks from markdown
+// ═══════════════════════════════════════
+
+export function extractCodeBlocks(markdown) {
+  if (!markdown) return [];
+  const blocks = [];
+  const re = /```([\w.:-]*)[ \t]*\r?\n([\s\S]*?)```/g;
+  let match;
+  while ((match = re.exec(markdown)) !== null) {
+    const raw = match[1] || "";
+    let lang = raw, filename = null;
+    const colonIdx = raw.indexOf(":");
+    if (colonIdx !== -1) {
+      lang = raw.slice(0, colonIdx);
+      filename = raw.slice(colonIdx + 1) || null;
+    }
+    blocks.push({ language: lang.toLowerCase(), filename, code: match[2] });
+  }
+  return blocks;
+}
+
+
 // ═══════════════════════════════════════
 //  Auth
 // ═══════════════════════════════════════