NoneadChina/dsh-nonead-prompt-recall

Shell-style prompt history in the DSH composer: ↑ in an empty composer recalls the previous prompt and keeps walking back, ↓ walks forward to the empty draft; history is kept per workspace, persisted across restarts and records only human input, while typing or editing a draft returns ↑/↓ to normal caret movement. Adds a Settings page to export, import and clear the history.