implemented light brightness slider

optimised state emit to only emit when change is detected

lib/features/shared_widgets/default_container.dart

@@ -6,19 +6,22 @@ class DefaultContainer extends StatelessWidget {
     required this.child,
     this.height,
     this.width,
+    this.color,
   });
 
   final double? height;
   final double? width;
   final Widget child;
 
+  final Color? color;
+
   @override
   Widget build(BuildContext context) {
     return Container(
       height: height,
       width: width,
       decoration: BoxDecoration(
-        color: Colors.white,
+        color: color ?? Colors.white,
         borderRadius: BorderRadius.circular(20),
       ),
       padding: const EdgeInsets.all(10),