One-click draft polishing plug-in

Key features

• button in the tool row — sits in conversation.input.right, the official seat for clickable controls beside the send button.
• Disabled while the draft is empty or pure whitespace, shows a spinner while polishing, and never lets double-clicks fire a second request.
• Zero-prefix flash rewrite — the host half rewrites the draft with a single deepseek-v4-flash stream (reasoningEffort: 'off', 2000 token cap).
• The main model never runs and its prefix cache is never touched.
• If the pinned model id is missing from the provider catalog, it retries once with a flash-class model discovered via llm.listModels.