The Agent Wars example in PR #292 embeds child WebViews below native model pickers. Its dropdowns require reserved empty space because anchored canvas surfaces cannot render above platform WebViews. Their late z-pass only affects ordering within the GPU canvas, so overlapping dropdown content is occluded.
Introduce a transient, transparent overlay surface above child WebViews for dropdowns, popovers, and tooltips. The overlay should exist only while content is visible, allowing underlying WebViews to remain live and render normally when it is hidden. Existing positioning, input, dismissal, focus, and accessibility behavior should be preserved.
The Agent Wars example in PR #292 embeds child WebViews below native model pickers. Its dropdowns require reserved empty space because anchored canvas surfaces cannot render above platform WebViews. Their late z-pass only affects ordering within the GPU canvas, so overlapping dropdown content is occluded.
Introduce a transient, transparent overlay surface above child WebViews for dropdowns, popovers, and tooltips. The overlay should exist only while content is visible, allowing underlying WebViews to remain live and render normally when it is hidden. Existing positioning, input, dismissal, focus, and accessibility behavior should be preserved.