fix(cli): checkout i18n branch from remote instead of HEAD

[AndreyHirsa]

Summary

Fix CI pull request flow to checkout existing translation branch from remote instead of HEAD, preventing duplicate PRs when the original is merged during a concurrent run.

Changes

• Fixed checkoutI18nBranch in pull-request.ts to create the local branch from remote instead of HEAD, so existing translations are preserved
• This eliminates unnecessary re-translation of already-translated content when the translation branch exists

Testing

• All tests pass locally

Visuals

N/A

Checklist

• Changeset added (if version bump needed)
• Tests cover business logic (not just happy path)
• No breaking changes (or documented below)

Summary by CodeRabbit

• Bug Fixes
  • Fixed CI pull request flow to properly reuse existing translation branches instead of starting from scratch, preventing duplicate PRs during concurrent runs.

[coderabbitai]

📝 Walkthrough

Walkthrough

A patch release is declared via changeset, fixing a bug in the CI pull request flow for i18n branch handling. The git checkout command is updated to explicitly track the remote branch, ensuring the local branch reuses existing translation branches instead of creating duplicates during concurrent CI runs.

Changes

Cohort / File(s)	Summary
Changeset Documentation .changeset/heavy-areas-happen.md	Declares patch release documenting the i18n branch reuse fix to prevent duplicate PRs during concurrent CI runs.
CI Pull Request Flow packages/cli/src/cli/cmd/ci/flows/pull-request.ts	Updates git checkout command from git checkout -b <branch> to git checkout -b <branch> origin/<branch> to establish explicit remote tracking for the local i18n branch.

Estimated code review effort

🎯 2 (Simple) | ⏱️ ~10 minutes

Suggested reviewers

• cherkanovart

Poem

🐰 A branch now tracks its distant twin,
No more duplicates pile in!
Concurrent runs need not despair,
When remotes and locals properly pair. ✨

🚥 Pre-merge checks | ✅ 3

✅ Passed checks (3 passed)

Check name	Status	Explanation
Title check	✅ Passed	The title clearly and accurately describes the main change: fixing the CI checkout flow to use remote instead of HEAD for the i18n branch.
Docstring Coverage	✅ Passed	No functions found in the changed files to evaluate docstring coverage. Skipping docstring coverage check.
Description check	✅ Passed	The PR description follows the template structure with Summary, Changes, Testing, Visuals, and Checklist sections. All required sections are present with substantive content.

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✨ Finishing Touches

📝 Generate docstrings

• Create stacked PR
• Commit on current branch

🧪 Generate unit tests (beta)

• Create PR with unit tests
• Commit unit tests in branch fix/ci-checkout-existing-i18n-branch

📝 Coding Plan

• Generate coding plan for human review comments

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