dsh-update-notifier: Persistent Version and Update Notifications in the DSH Sidebar

dsh-update-notifier is a community plugin (MIT licensed) maintained by arvin-yd, designed to provide version management for DeepSeek Harness (DSH). It persistently displays the currently installed DSH version at the bottom of the sidebar in the web interface, and monitors the latest version of `@deepseek-ai/dsh` by polling the npm registry. When an update is detected, the plugin shows a red dot and pops up an update panel, offering actions such as viewing version details, copying the update command, ignoring the update, or one-click updating. The one-click update supports both npx-cache and global npm installations, but requires two user confirmations, and an npx-cache update restarts the process to bind the port. This plugin requires Node.js >=22.0.