dsh-paste-doc: DSH Client Long-Text Paste Plugin

dsh-paste-doc is a DSH client plugin designed to address the challenge of models accurately referencing long pasted text. It automatically converts pasted long-form text into visualized citation chips and document cards, then serializes them into structured XML for the model to read when the message is sent. The plugin supports automatic conversion, document card preview, reference syntax (such as @docN), and minimalist styling, and is compatible with the Lexical input box in DSH 0.1.5. Users can use the `Ctrl+Shift+V` escape hatch to paste plain text.