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macOS maps a control chord by physical key regardless of layout: measured with UCKeyTranslate, physical A/U under Control produce U+0001/U+0015 on 2SetHangul, Russian and Greek exactly as on ABC, though unmodified those keys give ㅁ/ㅕ, ф/г, α/θ. A native terminal inherits this by passing the OS characters through. The browser does not expose that translation. xterm's legacy encoder works anyway because it reads keyCode, which Chromium reports from the physical key, but its kitty encoder derives the key number from `key` and only consults `code` when Shift or Option is held. Ctrl is not in that gate, so a pane with the kitty protocol negotiated reports CSI-u for U+3141 rather than 'a' and the chord does nothing. Ctrl+C escaped this only via its hand-written ETX bypass. Recover the byte from `code` when `key` is non-ASCII, which reproduces the OS control table. An ASCII `key` stays authoritative so a Dvorak remap is honoured. KeyC is excluded: the interrupt policy owns it, and off macOS that policy declines to a selection so the copy binding wins. Fixes #13331