refact

inc/screen/screen.manager.lua

@@ -1,3 +1,7 @@
+-- Ensure Screen table exists globally, and get a local reference to it
+local Screen = _G.Screen or {}
+_G.Screen = Screen
+
 local _screens = {}
 
 --- Registers a screen definition.
@@ -24,3 +28,9 @@ end
 function Screen.get_by_id(screen_id)
   return _screens[screen_id]
 end
+
+--- Gets all registered screens.
+-- @return table A table containing all registered screen data, indexed by their IDs.
+function Screen.get_all()
+  return _screens
+end