ci: build Core before inspecting downloaded themes

[rubyycheung]

Summary

• rebuild @astryxdesign/core in pr-visual after dependency installation
• let the downloaded theme artifacts resolve their @astryxdesign/core/dist/* imports
• preserve ci: ship the built themes to the PR visual gate #5477's downloaded-theme optimization without repeating the full workspace build

Why

#5477 began shipping built theme artifacts to pr-visual, but those artifacts import Core's consumer-facing dist files. The downstream job starts from a fresh checkout, installs dependencies without building packages, and therefore still fails before taking a screenshot:

ERR_MODULE_NOT_FOUND: packages/core/dist/theme/index.js
imported from packages/themes/butter/dist/source.mjs

This currently affects #5466 and #5475.

Test plan

• removed packages/core/dist and reproduced the exact import failure from packages/themes/butter/dist/source.mjs
• ran pnpm -F @astryxdesign/core build
• imported the same Butter theme build successfully afterward
• pnpm exec prettier --check .github/workflows/ci.yml
• parsed the workflow and verified the Core build step runs after install and before the visual gate

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Project	Deployment	Actions	Updated (UTC)
astryx	Ready	Preview	Aug 25, 2026 6:12am

[github-actions]

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[nynexman4464]

It looks like #5481 is the better fix, and it has now merged.

Both PRs address the same missing Core dist dependency. #5481 reuses the Core build that build-storybook already produced and ships it alongside the built themes; its armed pr-visual run completed successfully. This PR would instead rebuild Core inside every pr-visual job, adding work without improving the resulting artifact.

I think this PR can close as superseded by #5481.

[cixzhang]

Thanks — this is the half #5477 missed. I reproduced it: with core/dist removed the theme import fails exactly as CI shows, and building Core alone fixes it.

[Reviewed by Robohands]