fix: add react/react-dom overrides to prevent version mismatch

[joaopcm]

Summary

• Adds "react": "19.0.0" and "react-dom": "19.0.0" to pnpm.overrides in root package.json
• The migration to pnpm catalogs (feat: pnpm catalogs #3014) removed these overrides, but catalogs only apply when packages use catalog: specifiers — they don't govern auto-installed peer deps
• Packages with wide peer dep ranges (e.g. ^18.0 || ^19.0) were resolving react@19.2.3 instead of 19.0.0, causing Incompatible React versions errors at runtime

What broke

Error: Incompatible React versions: The "react" and "react-dom" packages must have the exact same version. Instead got:
  - react:      19.2.3
  - react-dom:  19.0.0

This affected all test suites using @testing-library/react in workspaces with wide react peer dep ranges.

---

Summary by cubic

Pin react and react-dom to 19.0.0 via root pnpm.overrides to keep versions in sync across workspaces. This prevents runtime “Incompatible React versions” caused by auto-installed peer deps resolving react@19.2.3.

• Bug Fixes
  • Add react: 19.0.0 and react-dom: 19.0.0 to root package.json pnpm.overrides; update pnpm-lock.yaml.
  • Force packages with wide peer ranges to resolve exactly 19.0.0 for both.
  • Stop relying on catalogs for peers, since catalog: doesn’t affect auto-installed peer deps.

^{Written for commit bbe1e42. Summary will update on new commits.}

[changeset-bot]

⚠️ No Changeset found

Latest commit: bbe1e42

Merging this PR will not cause a version bump for any packages. If these changes should not result in a new version, you're good to go. If these changes should result in a version bump, you need to add a changeset.

This PR includes no changesets

When changesets are added to this PR, you'll see the packages that this PR includes changesets for and the associated semver types

Click here to learn what changesets are, and how to add one.

Click here if you're a maintainer who wants to add a changeset to this PR

[vercel]

The latest updates on your projects. Learn more about Vercel for GitHub.

Project	Deployment	Actions	Updated (UTC)
react-email	Ready	Preview, Comment	Mar 9, 2026 8:01pm
react-email-demo	Ready	Preview, Comment	Mar 9, 2026 8:01pm

[cubic-dev-ai]

No issues found across 2 files

Confidence score: 5/5

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