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Adds prompt optimization, cancellation, and undo controls to the DeepSeek Harness composer.

Polishes the draft in the composer into a clearer, better-structured prompt from the ✨ button or Alt+O; streams the result live over SSE with reasoning shown first, and follows the session's default model with zero configuration or any OpenAI-compatible endpoint.

Optimize Prompt button under the composer: one click rewrites your draft into a clearer, more executable prompt, with a before-and-after dialog and one-click replacement.