feat: implement learning module page with AI-generated content and feedback workflow

src/components/admin/UploadZone.jsx

@@ -26,7 +26,7 @@ const UploadZone = ({ onUploadComplete }) => {
   const [status, setStatus]                 = useState(null);
 
   // GitHub sync state
-  const [githubUrl, setGithubUrl]           = useState('https://github.com/respellion/employee-handbook/tree/main/docs');
+  const [githubUrl, setGithubUrl]           = useState('https://github.com/respellion/employee-handbook/tree/main/docs/knowledge-base');
   const [isFetching, setIsFetching]         = useState(false);
   const [fileList, setFileList]             = useState(null);
   const [syncProgress, setSyncProgress]     = useState(null);