toolkit: add Overlay z-ordered stacking container#15
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The stacking container the widget model lacked: a primary Content child that fills the bounds, plus z-ordered Layers painted on top (last = topmost) so Popover/Toast/Notification/Tooltip/ContextMenu float without the host managing z-order or positions. Push/Pop/Top/Clear manage the stack; events route top-down (topmost hit-testing layer wins, else Content); Modal makes a miss swallow as a backdrop instead of falling through. Unlike Stack (one page at a time), Overlay draws every layer. 100% coverage. Co-Authored-By: Claude Opus 4.8 <noreply@anthropic.com>
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The third pre-1.0 "model edge" item: the stacking container so transient widgets can float above the main UI.
A primary
Contentchild fills the bounds; z-orderedLayerspaint on top (last = topmost) soPopover/Toast/Notification/Tooltip/ContextMenufloat without the host arranging z-order or positions.Push/Pop/Top/Clearmanage the stack; events route top-down (the topmost hit-testing layer wins, elseContent);Modalmakes a miss swallow as a backdrop instead of falling through.Unlike
Stack(which shows one page at a time),Overlaydraws every layer. Coordinates pass through unchanged (a surface-frame container, likePaned).100% coverage;
go vetclean; builds on all 6 arches + js/wasm.🤖 Generated with Claude Code