Katex not working for React example

not working originally
<img width="441" height="846" alt="Image" src="https://github.com/user-attachments/assets/21757985-e5b5-4dad-a482-2d5051d2aacf" />


TypeScript errors are fixed by adding null checks before calling loadCSS and loadJS
<img width="1076" height="879" alt="Image" src="https://github.com/user-attachments/assets/91399a65-c166-4add-93f7-1d7efbedab73" />