feat: add a quit action

desktop/src/main.rs

@@ -7,6 +7,8 @@ use gpui_component::{Theme, ThemeMode, ThemeRegistry, theme};
 use gpui_platform::application;
 use settings::{AppearanceMode, SettingsStore};
 
+actions!(signed, [Quit]);
+
 fn main() {
     tracing_subscriber::fmt::init();
 
@@ -17,6 +19,9 @@ fn main() {
             gpui_component::init(cx);
             theme::init(cx);
 
+            cx.bind_keys([KeyBinding::new("secondary-q", Quit, None)]);
+            cx.on_action(|_: &Quit, cx| cx.quit());
+
             // The persisted settings must load before the theme is applied.
             let store = cx.new(|cx| SettingsStore::new(paths::settings_file(), cx));
             SettingsStore::set_global(store.clone(), cx);