Macro actions 

macro_rules! actions {
    ($namespace:path, [ $( $(#[$attr:meta])* $name:ident),* $(,)? ]) => { ... };
    ([ $( $(#[$attr:meta])* $name:ident),* $(,)? ]) => { ... };
}

Defines unit actions without requiring consumers to depend on GPUI under the crate name gpui.

GPUI’s original macro spells its derive as gpui::Action, which does not resolve when GPUI is consumed solely through this facade.