dsh-workspace-explorer-picker: Replacing the In-App Directory Picker with Native Windows File Explorer

The DeepSeek Harness Desktop plugin dsh-workspace-explorer-picker is intended to replace the application's built-in directory selection UI by directly invoking the native Windows File Explorer. It supports using the system-level folder picker in the conversation Hero area and the sidebar, providing a more complete path navigation experience. The plugin is installed in the user directory and features update immunity, idempotent installation, and no volume restrictions. Users must run a PowerShell installation script to install the plugin and then restart the application. This plugin supports Windows only, relies on Electron's dialog component, and includes a fallback mechanism.