Overlays

An overlay is a child element marked .overlay(def): it leaves normal flow, lays out against the canvas, positions relative to its anchor (the parent), paints above everything, and hit-tests first.

The modes:

• Overlay::menu() — click the anchor to toggle; closes on outside click, Escape, or choosing a clickable inside (selects use this).
• Overlay::tooltip() — shows after a hover delay; never hit-tested.
• Overlay::modal() — open while present in the tree (app-driven), with backdrop and a focus trap; outside click/Escape emit on_close.
• Overlay::toasts() — app-driven stack pinned top-right; nothing closes it from outside.
• Overlay::context() — app-driven like modal, no backdrop; pins at the pointer position the moment it opens (right-click menus).

Kit wrappers: tooltip(target, text), modal(title), toast_stack(..), dropdown_menu(items), context_menu(items), popover(content), and combobox(value, open, options) — an editable select whose typing filters the listbox. Nested overlays (a select inside a modal) work. Enter animations are 200 ms fade (+slide for centered overlays); reduced motion snaps them.