dsh-air: Recall previous messages with ↑ / ↓, open side conversations with /btw.

# Introduction When chatting in DSH's web client, there are two common pain points: after sending a long message, if you want to modify it, you can only scroll up the chat history and manually copy it back into the input box; if you want to ask a small question unrelated to the current conversation, you either have to start a new session or interleave the context of the main conversation. dsh-air addresses these two issues as a plugin: pressing `↑` / `↓` in the input box directly switches between sent messages, while `/btw` opens a docked side conversation without disrupting the main dialogue. Below, we introduce its features, installation methods, and notes. # What is dsh-air dsh-air is a lightweight plugin for the DSH web client, maintained by kaieye. It is licensed under MIT, with the current version being 0.1.2 (packag...