As a follow up to {T416418}, configure and run an A/B test to measure the impact of the post-publish account creation bottom sheet on permanent account creation rates for Temporary Account users on mobile web.
**Acceptance Criteria**
* Instrumentation is implemented to track exposure, CTA clicks, and account creation outcomes.
* Primary metric: permanent account creation rate among Temporary Account users who publish an edit.
* Experiment is configured with 50% Control (current experience) and 50% Treatment (details:T424205) variants.
* Experiment is released to pilot wikis: French Wikipedia, Arabic Wikipedia, and Spanish Wikipedia.
QA Note:
- To opt into the treatment group, run mw.testKitchen.overrideExperimentGroup( 'we-1-8-tempuser-post-edit', 'treatment') in the browser console.
* Experiment monitoring confirms data is being collected correctly on all pilot wikis.