#35: `open` auto-reattaches when the bound relay tab is gone — drops the dead
page, opens a fresh tab in the session's group, and navigates it, instead of
only `tab new` recovering.
#36: scroll and click now reach content inside cross-origin OOPIFs:
- scroll dispatches a real wheel at a viewport point (default center, --at x,y,
or --frame n) so it scrolls the iframe under the pointer, which
window.scrollBy on the top document silently no-ops on.
- over the extension relay, clicks always use DOM-dispatch instead of
coordinate Input events — a coordinate event isn't confined to the target tab
on a busy real Chrome (it drifted onto the foreground tab) and an OOPIF
element's box can't be mapped to a top-viewport point.
leeguooooo
6830df50ea