fix(modernjs): stop sharing react/* subpaths to fix dispatcher issues

Author: ScriptedAlchemy

.ci-logs/build-manifest-host-dev.log

@@ -47,10 +47,7 @@ export default defineConfig({
           },
           filename: 'remoteEntry.js',
           shared: {
-            'react/': {
-              singleton: true,
-              requiredVersion: '^18.3.1',
-            },
+            // Share only top-level React packages for proper subpath resolution
             react: {
               singleton: true,
               requiredVersion: '^18.3.1',
@@ -59,10 +56,6 @@ export default defineConfig({
               singleton: true,
               requiredVersion: '^18.3.1',
             },
-            'react-dom/': {
-              singleton: true,
-              requiredVersion: '^18.3.1',
-            },
           },
           dataPrefetch: true,
         }) as any,