Update screenshot behavior

- Unifies screenshot to a single shortcut
- Provides easy override for screenshot editor of choice via env var or
flag
- Edit screenshots via clicking the notification
- Screenshots are copied to clipboard + saved by default

default/mako/core.ini

@@ -28,3 +28,7 @@ on-button-left=exec sh -c 'omarchy-notification-dismiss "Update System"; omarchy
 
 [summary~="Learn Keybindings"]
 on-button-left=exec sh -c 'omarchy-notification-dismiss "Learn Keybindings"; omarchy-menu-keybindings'
+
+[summary~="Screenshot copied & saved"]
+max-icon-size=80
+format=<b>%s</b>\n%b