The interactive controls page had drifted from the markdown fix-ups: PgUp/PgDn
rendered as unbound keys with no meaning (the volume keys live there now), and
the Rebinding section still promised 'an existing file is never overwritten' --
made false by the board-2 migration. Both corrected; the page and CONTROLS.txt
now tell the same story.
Co-Authored-By: Claude Opus 5 (1M context) <noreply@anthropic.com>