fix(@angular/ssr): unblock route extraction with withEnabledBlockingInitialNavigation

This fix ensures that route extraction is not blocked when `withEnabledBlockingInitialNavigation` is used.

Closes #29400

Author: alan-agius4

packages/angular/ssr/src/routes/ng-routes.ts

@@ -522,11 +522,19 @@ export async function getRoutesFromAngularRouterConfig(
       applicationRef = await bootstrap();
     }
 
+    const injector = applicationRef.injector;
+    const router = injector.get(Router);
+
+    // Workaround to unblock navigation when `withEnabledBlockingInitialNavigation()` is used.
+    // This is necessary because route extraction disables component bootstrapping.
+    setTimeout(() => {
+      // eslint-disable-next-line @typescript-eslint/no-explicit-any
+      (router as any).navigationTransitions.afterPreactivation()?.next?.();
+    }, 0);
+
     // Wait until the application is stable.
     await applicationRef.whenStable();
 
-    const injector = applicationRef.injector;
-    const router = injector.get(Router);
     const routesResults: RouteTreeNodeMetadata[] = [];
     const errors: string[] = [];