dsh-git-branch-switcher: A DSH Web Plugin That Displays and Switches Git Branches in the Session Header

`dsh-git-branch-switcher` is a DeepSeek Harness Web client plugin designed to address the inconvenience of frequently switching Git branches in a web interface. It integrates Git operations into the session header, providing branch viewing, switching, and status synchronization through capsule buttons and a panel. The plugin supports theme adaptation, handles detached HEAD states, and includes error feedback and a secure sandbox mechanism. It is easy to install and well suited for developers who frequently switch code branches, significantly reducing operational costs.