fix: don't show the entire conversation in error message

[edwinyjlim]

Users are seeing the entire conversation history with successful wizard runs because of API errors. https://posthoghelp.zendesk.com/agent/tickets/50556

Limit the error message to the line where the API error message appears.

[github-actions]

🧙 Wizard CI

Run the Wizard CI and test your changes against wizard-workbench example apps by replying with a GitHub comment using one of the following commands:

Test all apps:

• /wizard-ci all

Test all apps in a directory:

• /wizard-ci android
• /wizard-ci angular
• /wizard-ci astro
• /wizard-ci django
• /wizard-ci fastapi
• /wizard-ci flask
• /wizard-ci laravel
• /wizard-ci next-js
• /wizard-ci nuxt
• /wizard-ci react-native
• /wizard-ci react-router
• /wizard-ci sveltekit
• /wizard-ci swift
• /wizard-ci tanstack-router
• /wizard-ci tanstack-start
• /wizard-ci vue

Test an individual app:

• /wizard-ci android/Jetchat
• /wizard-ci angular/angular-saas
• /wizard-ci astro/astro-hybrid-marketing

Show more apps

• /wizard-ci astro/astro-ssr-docs
• /wizard-ci astro/astro-static-marketing
• /wizard-ci astro/astro-view-transitions-marketing
• /wizard-ci django/django3-saas
• /wizard-ci fastapi/fastapi3-ai-saas
• /wizard-ci flask/flask3-social-media
• /wizard-ci laravel/laravel12-saas
• /wizard-ci next-js/15-app-router-saas
• /wizard-ci next-js/15-app-router-todo
• /wizard-ci next-js/15-pages-router-saas
• /wizard-ci next-js/15-pages-router-todo
• /wizard-ci nuxt/movies-nuxt-3-6
• /wizard-ci nuxt/movies-nuxt-4
• /wizard-ci react-native/expo-react-native-hacker-news
• /wizard-ci react-native/react-native-saas
• /wizard-ci react-router/react-router-v7-project
• /wizard-ci react-router/rrv7-starter
• /wizard-ci react-router/saas-template
• /wizard-ci react-router/shopper
• /wizard-ci sveltekit/CMSaasStarter
• /wizard-ci swift/hackers-ios
• /wizard-ci tanstack-router/tanstack-router-code-based-saas
• /wizard-ci tanstack-router/tanstack-router-file-based-saas
• /wizard-ci tanstack-start/tanstack-start-saas
• /wizard-ci vue/movies

Results will be posted here when complete.

[sarahxsanders]

ooof yeah this is a great UX improvement