Two demo-guide.spec.ts tests navigated straight to /scenarios right after
clicking a login button without waiting for the /dashboard redirect to
settle first. This raced harmlessly on localhost but flaked against the
higher-latency Unraid deployment, hitting RequireAuth before the session
was confirmed.
Adds a compact "Probeer een demonstratiescenario" page listing the 5 named
scenarios with live readiness from the manifest, plus a Demo Guide side
panel (bottom sheet on mobile) that walks an Operations Manager through
all 8 steps with per-step context, live-resolved routes, sessionStorage
progress, and a "Demo opnieuw voorbereiden" restart. Login's guided-demo
CTA now actually opens the guide. Fixes a real mobile topbar overflow the
new guide trigger introduced.