Add a pixel whale to the DeepSeek Harness session title bar with dsh-ui-whale

### 修正后的准确翻译（符合技术文档规范）： dsh-ui-whale is a DeepSeek Harness Web UI interface enhancement plugin maintained by lhh010. It adds a 22-frame hand-drawn pixel whale that stays permanently in the session title bar, with animations including blinking, tail wagging, spouting water and sleeping synced with session snapshots. Clicking the whale will trigger a heart effect. The plugin does not modify core functions nor intercept model requests. This article verifies the installation commands, version compatibility and precautions against the community directory page and GitHub README/INSTALL.md.