Fix desync after Cmd-N: a late Chromium page gets the keys through the focus model; G1 counts cmux pages - #29272

Fix desync after Cmd-N: a late Chromium page gets the keys through the focus model; G1 counts cmux pages#29272

cmux-bot[bot] merged 5 commits into

feat-cmux-nextmanaflow-ai/cmux:feat-cmux-nextfrom

fix/desync-cmd-n-page-windowmanaflow-ai/cmux:fix/desync-cmd-n-page-windowCopy head branch name to clipboard