move webpack check into index

frontend/src/index.ts

@@ -5,6 +5,11 @@ interface Window {
 }
 
 (async () => {
+  // Wait for react to definitely be loaded
+  while (!window.webpackChunksteamui || window.webpackChunksteamui <= 3) {
+    await new Promise(r => setTimeout(r, 10)); // Can't use DFL sleep here.
+  }
+
   if (!window.SP_REACT) {
     console.debug('[Decky:Boot] Setting up React globals...');
     // deliberate partial import