Single-owner window keydown action for the Transcribe panel: j/k region
nav, e mode toggle, n draw (edit only), t training mark, Delete, ? cheat-
sheet, and the Esc precedence ladder (cheatsheet → editable no-op → close
panel). Pure input-to-callback translator with a focus guard that exempts
only "?"; removes its listener on destroy. 20 unit tests cover every key,
the panel/focus guards, the Esc matrix, and teardown.
Co-Authored-By: Claude Sonnet 4.6 <noreply@anthropic.com>
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