fix(react-email): render email templates in separate nodejs process to avoid OOM issues

[framebassman]

closes #2887

---

Summary by cubic

Render react-email templates in separate worker processes to prevent out-of-memory crashes when exporting large sets. Each template is rendered in isolation with cleanup to reduce memory use and improve stability. Fixes #2887.

• Bug Fixes
  • Spawn a Node process per template to isolate memory and avoid OOM.
  • Write output (.html or .txt) and delete the built .cjs immediately.
  • Update spinner to show per-template progress and clearer errors.

^{Written for commit a4f378d. Summary will update on new commits.}

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commit: a4f378d

[cubic-dev-ai]

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