- useKeyBind refuses Tab/Enter/arrows/Home/End/Page*/Escape and bare modifier codes, and refuses a code equal to the other call key, with an inline message (isBindableCallKey, unit-tested). - PTT and deafen handlers ignore events with Ctrl/Alt/Meta held (deafen also Shift), so Cmd+M / Ctrl+M no longer toggle deafen. - PTT only preventDefault()s when the target is not an interactive control, so Space still activates focused buttons during a call. Fixes #23 Co-Authored-By: Claude Opus 5 <noreply@anthropic.com> Claude-Session: https://claude.ai/code/session_01PPmy3tPq869XDW4njjVaKA