Placeful 2.2 — staff linking, area lifecycle & PWA hardening

Highlights

• Staff accounts, one link — employees now link to a user account through a single path, and terminated staff keep a read-only portal instead of losing access to their history.
• Area deletion lifecycle — delete a floor area safely: booking guards block destructive deletes, table placements are removed automatically, and deleted areas can be restored.
• Seating hardening — multi-table assignments validate correctly and pin-window edge cases no longer slip through.
• PWA reliability — the installed app handles offline fallbacks, service-worker updates, and push subscribe/unsubscribe edge cases more gracefully.
• Planner tour fix — the guided tour no longer skips a step on days without tasks.