View PR button shows stale/merged PR instead of current open PR

Description

The "View PR" button in Claude Code Desktop links to a previously merged PR instead of the current open PR for the same branch.

Steps to Reproduce

1. Have a branch with an open PR that gets merged
2. Make new commits on the same branch
3. Create a new PR from the same branch
4. Observe the "View PR" button in Claude Code Desktop

Expected Behavior

The "View PR" button should link to the newest open PR for the current branch.

Actual Behavior

The button still links to the old merged PR. Restarting the app and pushing new commits did not refresh it.

Environment

• Claude Code Desktop (macOS, Apple Silicon)