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In the kanban Preview tab, render a small kandev-controlled composer below the PassthroughTerminal when the session is is_passthrough. Submitting (Enter or click) posts message.add over WS — the backend's Executor.Prompt routes passthrough sessions to PTY stdin so the CLI agent actually receives it. Shift+Enter inserts a newline; empty/whitespace input is disabled. This closes #989 together with the previous backend commit. Co-Authored-By: Claude Opus 4.7 <noreply@anthropic.com>