fix(ui): avoid ChatGPT 431 for long Copy for AI prompts

[ompathak2004]

Fixes #3403

Intent

This PR fixes a bug in the demo/editor toolbar where Copy for AI -> Open in ChatGPT can fail with HTTP 431 when the generated prompt is too long.

Technical context

Open in ChatGPT uses a URL with ?q=${encodeURIComponent(prompt)}.
For large prompts (template code + diagnostics), the URL can exceed practical request limits and ChatGPT fails to load.

Changes

• Added a safety check for ChatGPT URL length.
• If prompt is within safe size, keep existing behavior (open prefilled ChatGPT URL).
• If prompt is too long:
  • copy full prompt to clipboard
  • open plain https://chatgpt.com/ (no oversized query string)
  • show inline helper text in menu item:
    Long prompt: copied to clipboard. Paste with Ctrl+V / Cmd+V
• Reused existing handleCopyMarkdown logic.

Scope

• Changed file:
  • packages/ui/src/components/toolbar/copy-for-ai.tsx
• No API/server changes.
• No behavior changes for Claude/Cursor links.

Before

After

---

Summary by cubic

Prevents ChatGPT 431 errors in the editor toolbar by handling very long “Copy for AI” prompts. Fixes #3403 and keeps the ChatGPT flow reliable with a clear fallback.

• Bug Fixes

  • Enforce max ChatGPT URL length (7500 chars); if exceeded, open https://chatgpt.com/ without query.
  • On fallback, copy the full prompt to clipboard on click and show: “Long prompt: copied to clipboard. Paste with Ctrl+V / Cmd+V”.
  • Short prompts keep the prefilled ChatGPT URL; Claude and Cursor links are unchanged.

• Dependencies

  • Add changeset for @react-email/ui patch; update lockfile only.

^{Written for commit a9ee0ac. Summary will update on new commits. Review in cubic}

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[changeset-bot]

🦋 Changeset detected

Latest commit: 484d3bb

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

This PR includes changesets to release 3 packages

Name	Type
@react-email/ui	Patch
react-email	Patch
@react-email/editor	Patch

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[pkg-pr-new]

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npm i https://pkg.pr.new/@react-email/ui@3404

commit: 484d3bb

[cubic-dev-ai]

No issues found across 1 file

Confidence score: 5/5

• Automated review surfaced no issues in the provided summaries.
• No files require special attention.

[gabrielmfern]

I like it! Thank you

[cubic-dev-ai]

0 issues found across 2 files (changes from recent commits).

_{Shadow auto-approve: would auto-approve. Isolated UI fix for ChatGPT URL length limits. Low risk, improves UX for long prompts by falling back to clipboard copy.}