Support gh pr checkout pull request references

[juliusmarminge]

Summary

• Accept gh pr checkout <ref> input in pull request parsing, including raw numbers, #numbers, and GitHub PR URLs.
• Update the pull request dialog copy to show the new supported input format.
• Keep the synthetic branch picker item visible for gh pr checkout queries so PR checkout remains selectable in the branch toolbar.
• Automatically run the project setup script after preparing a pull request worktree thread.
• Add coverage for the new PR parsing, branch picker filtering, and worktree setup flow.

Testing

• bun run test for the updated web tests.
• bun fmt
• bun lint
• bun typecheck

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Note

Medium Risk
Medium risk: extends pull-request reference parsing and changes post-PR worktree preparation behavior to auto-run setup scripts, which could affect draft thread navigation and terminal/script execution flow.

Overview
Adds support for treating gh pr checkout <ref> (number, #number, or PR URL) as a valid pull request reference, and updates the PR dialog copy to advertise the new format.

Adjusts the branch toolbar search filtering so the synthetic “Checkout Pull Request” (and create-branch) picker items stay visible even when the query text wouldn’t match the item value.

After preparing a pull-request worktree thread, ChatView now schedules and runs the project’s setup script (when runOnWorktreeCreate is enabled) in the new worktree, with new/updated tests covering PR parsing, picker filtering, and the setup-script execution flow.

^{Written by Cursor Bugbot for commit 9d2d206. This will update automatically on new commits. Configure here.}

Note

Support gh pr checkout commands as pull request references

• parsePullRequestReference now accepts gh pr checkout 42, gh pr checkout #42, and gh pr checkout <PR URL>, extracting and normalizing the trailing argument.
• The branch picker in BranchToolbarBranchSelector retains the 'Checkout Pull Request' synthetic item when the query matches a gh pr checkout command, using the new shouldIncludeBranchPickerItem helper.
• PullRequestThreadDialog updates its placeholder and validation text to mention gh pr checkout as an accepted input format.
• After a pull request worktree thread is prepared, the app now automatically runs the project's configured setup script in the new worktree.

^{Macroscope summarized 9d2d206.}

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✨ Finishing Touches

🧪 Generate unit tests (beta)

• Create PR with unit tests
• Commit unit tests in branch t3code/gh-pr-checkout-detect

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