ZIndex(Z_HUD + 4) and ZIndex(Z_HUD + 5) across four sites in
hud_plugin.rs were magic-number expressions. Define named constants in
ui_theme:
Z_HUD_POPOVER_BACKDROP = Z_HUD + 4 (fullscreen dismiss backdrop)
Z_HUD_POPOVER = Z_HUD + 5 (popover panel)
The score-delta floater (Z_HUD + 10) now uses the existing Z_HUD_TOP
constant, whose doc is updated to mention transient annotations.
Both new constants are added to the monotonic z-hierarchy test.
Co-Authored-By: Claude Sonnet 4.6 <noreply@anthropic.com>
funman300
4aafc0a53d