fix: include autoResize option in useApp hook

The React useApp hook was overriding the entire options object when
passing experimentalOAICompatibility, causing autoResize to be
undefined instead of true. This prevented automatic size notifications
from being set up.

Author: ochafik

src/react/useApp.tsx

@@ -137,6 +137,7 @@ export function useApp({
       try {
         const app = new App(appInfo, capabilities, {
           experimentalOAICompatibility,
+          autoResize: true,
         });
 
         // Register handlers BEFORE connecting