dsh-share: Export DSH Conversations as Images or Markdown

dsh-share is a DSH web client plugin maintained by hellodigua, designed to select single or multiple Q&A rounds from a session and export them as PNG images or Markdown. It supports multi-select interactions consistent with the DeepSeek web interface, allows adjustment of image width and font size, hides intermediate processes, and preserves code blocks, tables, and tool call summaries. Installation is done via `dsh plugin --profile web add dsh-share`, and it is compatible with `@deepseek-ai/dsh ^0.1.0-rc.6`.