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<!-- CURSOR_SUMMARY -->
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> [!NOTE]
> Adds a pull workflow and consolidates branch operations into a single
actions menu.
> 
> - UI: Replace standalone buttons with `Branch actions` dropdown
(`GithubBranchManager.tsx`) containing `Create new branch`, `Refresh
branches`, and new `Git pull`; disables controls while pulling
> - IPC: New `github:pull` contract and handler that pulls from `origin`
on current branch, uses auth token, tolerates missing remote branch, and
reloads branches (`src/ipc/types/github.ts`,
`src/ipc/handlers/git_branch_handlers.ts`)
> - E2E: Update flows to use `branch-actions-menu-trigger`; add pull
test and snapshots; factor `configureGitUser()` helper (`e2e-tests/...`)
> 
> <sup>Written by [Cursor
Bugbot](https://cursor.com/dashboard?tab=bugbot) for commit
40bb9e7cd72308acf34563e9758884d2b0c2cd4e. This will update automatically
on new commits. Configure
[here](https://cursor.com/dashboard?tab=bugbot).</sup>
<!-- /CURSOR_SUMMARY -->

<!-- This is an auto-generated description by cubic. -->
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## Summary by cubic
Adds Git pull support and consolidates branch actions into a single
“Branch actions” menu, making it easy to pull remote changes from the
UI. Includes IPC wiring and an end-to-end test.

- **New Features**
- Added “Branch actions” dropdown with Create branch, Refresh branches,
and Git pull.
  - Git pull action with loading state and success/error toasts.
- New IPC contract and handler (github:pull) that pulls from origin and
tolerates missing remote branch.

- **Refactors**
- Replaced separate buttons with a dropdown in GithubBranchManager and
updated test IDs.
- Added configureGitUser helper and new e2e test for pulling from
remote.
  - Updated snapshots to reflect the new menu.

<sup>Written for commit 40bb9e7cd72308acf34563e9758884d2b0c2cd4e.
Summary will update on new commits.</sup>

<!-- End of auto-generated description by cubic. -->