some updates

callbacks/screen.py

@@ -1,5 +1,7 @@
 import monitorcontrol
 
+BRIGHTNESS = 10
+
 def get_monitors():
     """Retrieve a list of connected monitors."""
     return monitorcontrol.get_monitors()
@@ -13,9 +15,16 @@ def set_brightness(monitor, brightness):
         print(f"Set brightness to {brightness}%")
 
 
-def chenge_brightness(args):
+def get_brightness(args):
+    global BRIGHTNESS
+    return {"value":BRIGHTNESS}
+
+
+def change_brightness(args):
+    global BRIGHTNESS
     try:
         level = args.get('level', 10)
+        BRIGHTNESS = level
         monitors = get_monitors()
         if not monitors:
             raise OSError(f"No DDC/CI compatible monitors found.")