opt: color (#1782)

* fixes

* opt: color

* fix

lib/utils/extension/theme_ext.dart

@@ -1,3 +1,4 @@
+import 'package:flex_seed_scheme/flex_seed_scheme.dart';
 import 'package:flutter/material.dart';
 
 extension ColorSchemeExt on ColorScheme {
@@ -17,6 +18,16 @@ extension ColorExtension on Color {
     assert(amount >= 0 && amount <= 1, 'Amount must be between 0 and 1');
     return Color.lerp(this, Colors.black, amount)!;
   }
+
+  ColorScheme asColorSchemeSeed([
+    FlexSchemeVariant variant = .material,
+    Brightness brightness = .light,
+  ]) => SeedColorScheme.fromSeeds(
+    primaryKey: this,
+    variant: variant,
+    brightness: brightness,
+    useExpressiveOnContainerColors: false,
+  );
 }
 
 extension BrightnessExt on Brightness {