feat(diary) Addeed mood and satiety picker scale to the screen

lib/widgets/custom_scale_element.dart

@@ -0,0 +1,28 @@
+import 'package:flutter/material.dart';
+
+class ScaleElement extends StatelessWidget {
+  final Color color;
+  final bool isSelected;
+  final VoidCallback onTap;
+
+  const ScaleElement({
+    required this.color,
+    required this.isSelected,
+    required this.onTap,
+  });
+
+  @override
+  Widget build(BuildContext context) {
+    return GestureDetector(
+      onTap: onTap,
+      child: Container(
+        width: isSelected ? 40 : 20,
+        height: isSelected ? 40 : 20,
+        decoration: BoxDecoration(
+          color: color,
+          shape: BoxShape.circle,
+        ),
+      ),
+    );
+  }
+}