Function close_dialogs_on_escape 

pub fn close_dialogs_on_escape(
    keys: MessageReader<'_, '_, KeyPressed>,
    press_cancel: Option<Res<'_, EscapePressCancel>>,
    store: ResMut<'_, PropertyStore>,
    blocks: Query<'_, '_, (&IfMarker, Option<&Visible>, Option<&DialogMarker>)>,
)

On Escape, close the top-most open popup layer - one press peels off exactly one layer.

Priority mirrors paint order (later-painted popups sit on top):

1. an open <dropdown> panel (__dropdown_open:* signal is true),
2. otherwise an open <menu> panel (__menu_open:* signal is true),
3. otherwise the top-most open <dialog>.

Dropdown / menu panels are gated by <if eq="true" mode="hide"> blocks whose IfMarker::signal_name is the synthetic open signal, so the same IfMarker query that drives dialogs finds them too - no dependency on the panel’s runtime marker components (which the <if>-body template path does not propagate). Closing writes the open signal to false (dropdown / menu) or "" (dialog); the next reconcile_if_blocks tick flips Visible(false) on the subtree (IfMode::Hide preserves child state across the toggle).

Bare Esc keypresses with nothing open pass through untouched.

An Escape that cancelled an in-flight press (lumen_input::cancel_press_on_escape sets EscapePressCancel earlier in the Input stage) is consumed by the cancel - the dialog stays open on that keystroke.