Changed .pulse-shell from fixed 95rem cap to fluid clamp(95rem, 92vw, 120rem)
to match standard monitoring dashboard behavior (Proxmox, Grafana, Portainer).
On laptops/small screens: unchanged (capped at 1520px)
On 1080p displays: expands to ~1766px usable width
On 4K/ultrawide: expands up to 1920px max for readability
Added back 2xl column widths (totaling ~1720px) that properly fit within
the expanded shell, giving wide-display users more breathing room while
maintaining proportional scaling across all breakpoints.
Changed files:
- index.css: Update .pulse-shell max-width to use clamp()
- Dashboard.tsx: Add 2xl column widths calculated for expanded shell
- GuestRow.tsx: Add matching 2xl column widths
