Build fixes: offline-safe fonts, Next.js API route type updates, TS strict errors resolved, MUI import cleanup, chat markdown wrapper, Azure OpenAI typing, caching key + chapter API id types, and misc error-logging typings.

tsconfig.json

@@ -36,6 +36,7 @@
     ".next/types/**/*.ts"
   ],
   "exclude": [
-    "node_modules"
+    "node_modules",
+    "scripts"
   ]
 }