Keydowns handled outside the terminal (keybindings via beforeKey, copy
and paste shortcuts, AltGraph text) now record their physical code and
skip the matching keyup, so Kitty report-event-types sessions no longer
receive a release for a press that was suppressed locally. beforeKey is
not re-consulted on keyup because it runs side effects. Stale
suppressions are dropped on blur.

Co-Authored-By: Claude Fable 5 <noreply@anthropic.com>