Mobile web Book CTA
Signed-in mobile web keeps a persistent Book CTA above the tab bar.
Talent profiles on small viewports keep a sticky Book CTA. Desktop hides it in favor of in-page CTAs. Checkout, Live, Directs, and merch keep a sticky pay control above the signed-in tab bar (3.5rem tab + safe-area inset) so it does not cover primary actions on iPhone home-indicator devices.