feat: starter kit.

lib/utils/extensions/colors.dart

@@ -0,0 +1,12 @@
+import 'dart:ui';
+
+/// Extension on [Color] to provide additional color manipulation utilities.
+extension ColorExtensions on Color {
+  /// Returns a new color with the given [opacity] applied.
+  ///
+  /// The [opacity] value should be between `0.0` (fully transparent) and `1.0` (fully opaque).
+  /// If the value is out of bounds, it is clamped within the valid range.
+  Color applyOpacity(double opacity) {
+    return withAlpha((opacity * 255).toInt().clamp(0, 255));
+  }
+}