Add components/Overlay.tsx (portals to <body>) and route the in-tree full-screen/
floating holdouts through it — ChatDock, OnboardingWizard, GlassTuner — so they
escape any ancestor stacking context (mask/transform/backdrop-filter) instead of
relying on a bare high z-index. Toaster stays in-tree (it's content-column-scoped
by design, outside the masked scroller); Welcome is a page, not an overlay.
peter
6075e96bd0