Split PR creation into granular progress stages

[juliusmarminge]

Summary

• Breaks PR creation progress into three clearer stages: preparing, generating content, and creating the GitHub pull request.
• Updates server-side progress emission so PR work reports each phase separately instead of a single coarse status.
• Aligns the web UI progress stage builder with the new PR lifecycle and expands unit coverage for the updated flow.

Testing

• Not run (PR description only).

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Note

Low Risk
Low risk: changes are limited to progress event labeling/emission and UI stage mapping, with unit tests updated to enforce the new sequence.

Overview
PR creation progress is now reported as three explicit PR sub-stages instead of a single "Creating PR" stage: Preparing PR..., Generating PR content..., and Creating GitHub pull request....

On the server, runPrStep now accepts a progress emitter and emits additional phase_started events around PR content generation and the gh pr create call; the web UI’s buildGitActionProgressStages is updated to mirror these new labels for create_pr and commit_push_pr, with tests expanded/updated to validate the new stage order.

^{Written by Cursor Bugbot for commit b429974. This will update automatically on new commits. Configure here.}

Note

Split PR creation into three granular progress stages

Replaces the single 'Creating PR...' progress event with three sequential stages: 'Preparing PR...', 'Generating PR content...', and 'Creating GitHub pull request...'. The new stages are emitted from runPrStep in GitManager.ts and reflected in buildGitActionProgressStages in GitActionsControl.logic.ts for create_pr and commit_push_pr actions.

^{Macroscope summarized b429974.}

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✨ Finishing Touches

🧪 Generate unit tests (beta)

• Create PR with unit tests
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[macroscopeapp]

Approvability

Verdict: Approved

This PR only changes progress labels shown during PR creation, splitting one stage into three more descriptive stages. No business logic is altered - tests and frontend logic are updated to match the new labels. Low risk UI/UX enhancement.

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[coderabbitai]

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✨ Finishing Touches

🧪 Generate unit tests (beta)

• Create PR with unit tests
• Commit unit tests in branch t3code/pr-progress-granularity

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_{Comment @coderabbitai help to get the list of available commands and usage tips.}