Improved category with colors

lib/repositories/account/models/category.dart

@@ -1,3 +1,5 @@
+import 'dart:ui';
+
 class Category {
   String label;
   String color;
@@ -18,4 +20,8 @@ class Category {
     'label': label,
     'color': color,
   };
+
+  Color rgbToColor() {
+    return Color(int.parse(color.toUpperCase().replaceAll("#", ""), radix: 16));
+  }
 }