fix: use cookie/urlParam-based fallback by default with redirect action

packages/experiment-tag/src/experiment.ts

@@ -999,6 +999,10 @@ export class DefaultWebExperimentClient implements WebExperimentClient {
       return;
     }
     this.globalScope.location.replace(targetUrl);
+    // location.replace() queues navigation but JS continues — stall so applyVariants
+    // never resolves and removeAntiFlickerCss() is never called during the unload window.
+    // eslint-disable-next-line @typescript-eslint/no-empty-function
+    await new Promise(() => {});
   }
 
   private handleMutate(action, flagKey: string, variant: Variant) {

packages/experiment-tag/src/types.ts

@@ -134,7 +134,7 @@ export interface WebExperimentConfig extends ExperimentConfig {
 export const Defaults: WebExperimentConfig = {
   useDefaultNavigationHandler: true,
   redirectConfig: {
-    encodeRedirectInUrl: false,
+    encodeRedirectInUrl: true,
     encodeRedirectInCookie: true,
   },
 };