orion-ecs / keen-eye / 20827855741 / 1

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fix(ui): Fix hit testing to inherit z-index from ancestors

Menu items weren't receiving hover events because the HierarchyTreeView
(at greater depth) was winning hit tests despite the menu having
LocalZIndex=1000.

The depth score formula was: depth * 10000 + LocalZIndex
This meant deeper elements always won regardless of z-index.

New formula: (accumulated z-index) * 100000 + depth * 100
This ensures overlay elements (menus, tooltips, modals with z >= 1000)
always beat non-overlay elements regardless of hierarchy depth.

The z-index is now accumulated from ancestors, so children of high-z
elements inherit that priority in hit testing.

Co-Authored-By: Claude Opus 4.5 <noreply@anthropic.com>

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