When the Menu or Modes popover was open, pressing Escape (Android back)
fired the Pause system instead of closing the popover, because both
systems listened to the same key with no coordination.
Fix:
- Add HudPopoverOpen marker to both popover entities on spawn.
- Add close_menu/modes_popover_on_escape systems in HudPlugin that
despawn the popover + backdrop when Escape is pressed.
- Guard toggle_pause with an open_hud_popovers query: bail if any
HudPopoverOpen entity exists, preventing Pause from stacking behind
the closing popover.
- Init ButtonInput<KeyCode> in HudPlugin::build() so the new systems
work under MinimalPlugins in tests.
Co-Authored-By: Claude Sonnet 4.6 <noreply@anthropic.com>
funman300
d204662415