Replace the header notification bell (now hidden by default; still reachable
via Settings → Notifications and the drawer) with a multi-monitor button.
Clicking it POSTs /api/system/span-displays, which spawns the bundled
scripts/span-codeman.sh — a fresh, maximized browser --app window sized to the
union of all displays — so in-page floating session panels can be dragged
across the physical monitor seam. macOS only; needs the one-time "Displays
have separate Spaces" OFF prerequisite (documented in the script). The route
pins the spanned window to localhost with a digits-only port from the Host
header so nothing attacker-controllable reaches the launched browser.
Co-Authored-By: Claude Opus 4.8 (1M context) <noreply@anthropic.com>
arkon