fix(@angular/build): set es2016 target for Rolldown prebundling in Zone.js apps

Rolldown dependency prebundling in Vite dev server did not receive target options, leaving native async/await in prebundled dependencies. When an application uses Zone.js, native async/await causes Zone.js context loss across await ticks.

Fixes #33770

Author: alan-agius4

packages/angular/build/src/builders/dev-server/vite/index.ts

@@ -389,11 +389,13 @@ export async function* serveWithVite(
         ? browserOptions.polyfills
         : [browserOptions.polyfills];
 
-      const target = transformSupportedBrowsersToTargets(browsers);
-      if (!isZonelessApp(polyfills)) {
-        // Rolldown doesn't have an option to support Zone.js/async-await, so we need to support es2016.
-        target.push('es2016');
-      }
+      // Rolldown does not support selective feature downleveling for Zone.js async/await syntax.
+      // For applications using Zone.js, we target 'es2016' to force downleveling.
+      // The target array is replaced rather than appended to avoid Rolldown initialization errors when mixing browser targets.
+      // [BUNDLER_INITIALIZE_ERROR] 'chrome149.0' is already specified.
+      const target = isZonelessApp(polyfills)
+        ? transformSupportedBrowsersToTargets(browsers)
+        : ['es2016'];
 
       let ssrMode: ServerSsrMode = ServerSsrMode.NoSsr;
       if (