refactor(actions): plugin and virtual modules

[florian-lefebvre]

Changes

• Extracted from feat: update actions to not use proxies #14484 and feat: zod v4 #14529
• While working on actions recently, I found several things could be improved
  • Use a single vite plugin
  • We don't need codegen, I updated the implementation to be closer to virtual-modules/i18n.ts. Allowed to spot some runtime things that were incorrect
  • Things in actions/runtime/virtual were not only imported by the virtual module, so I moved them to actions/runtime
• This will help by being more consistent with other features, and will make the Zod 4 PR diff smaller

Testing

Should pass

Docs

Technically doesn't need a changeset but I'll include one to be safe

[changeset-bot]

🦋 Changeset detected

Latest commit: da1d710

The changes in this PR will be included in the next version bump.

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[codspeed-hq]

CodSpeed Performance Report

Merging #14538 will not alter performance

_{Comparing feat/refactor-actions-plugin (da1d710) with main (62ec8ea)¹}

Summary

✅ 6 untouched

Footnotes

1. No successful run was found on main (4632db3) during the generation of this report, so 62ec8ea was used instead as the comparison base. There might be some changes unrelated to this pull request in this report. ↩

[ematipico]

Overall, that's a great refactor. Thank you @florian-lefebvre! I left some comments, but they are mostly open-ended