Replaced visibility toggling with z-index layer management. Nothing
gets hidden — fullscreen apps render on top, gameplay stays underneath.
Supports future hybrid layouts (insert-mode map alongside gameplay).
Added gameplay_occluded signal: WorldRenderer skips tile/fog/entity
updates when a fullscreen implant app covers it. Prevents wasted
render work behind opaque overlays. Other renderers can connect to
the same signal.
Modes: GAMEPLAY (z=0), INSERT (z=10), FULLSCREEN (z=20), MODAL (z=30).
Star map uses app_changed signal to toggle its own visibility based
on whether its app is active.
Co-Authored-By: Claude Opus 4.6 (1M context) <noreply@anthropic.com>
jpmschweitzerandClaude Opus 4.6
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