Previous approach tried to fix the flex height chain, but it proved fragile
across grid → main → outlet → page transitions. New approach: action bar is
position:fixed at the bottom of the viewport, offset by sidebar width via
CSS variable --sidebar-w. Conversation area has pb-20 for clearance.
This works regardless of the height chain, email verification banner,
or any other variable-height elements above the session.
Co-Authored-By: Claude Opus 4.6 (1M context) <noreply@anthropic.com>
chihlasm
9d202c67f2