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Composer expand toggle for DeepSeek Harness: a ⬆/⬇ button in the composer tool row toggles the input between the default capped height and a tall 70vh writing view, so long drafts stay readable.

Auto-expand composer for DeepSeek Harness: a ⤢ button appears at the top-right of the composer card when the text wraps to 3+ visual lines, stretching the input to near-fullscreen height on click.