## Summary
Fixed the regression where the Create PR dialog was defaulting to the repository's current checked-out branch (`is_current`) instead of the task attempt's configured target branch.
### Changes Made
1. **`frontend/src/components/dialogs/tasks/CreatePRDialog.tsx`**:
- Added `targetBranch?: string` to the props interface
- Destructured `targetBranch` in the component
- Updated the default branch selection logic to prioritize `targetBranch` over `is_current`
2. **`frontend/src/components/tasks/Toolbar/GitOperations.tsx`**:
- Pass `targetBranch: getSelectedRepoStatus()?.target_branch_name` when showing the dialog
### Behavior
- When opening the Create PR dialog, it now defaults to the attempt's target branch (from `RepoBranchStatus.target_branch_name`)
- Falls back to the current branch (`is_current`) only if the target branch is not set or not found in the branch list
- This restores the original intended behavior that was lost during the multi-repo refactor
5810c7cccf