Update README.MD

Author: petertzy

README.MD

@@ -1,6 +1,6 @@
 # Markdown Reader
 
-<img width="1436" height="759" alt="Image" src="https://github.com/user-attachments/assets/69fb811b-7be6-482e-8b47-bdcc1e0c8dec" />
+<img width="1320" height="723" alt="Image" src="https://github.com/user-attachments/assets/01271258-68f1-4b34-ae08-c94daf80af43" />
 
 Modern Markdown editor with a Next.js UI, FastAPI backend, AI features, and desktop packaging via Tauri.